UBUNTU-CVE-2026-23074: High severity ubuntu/linux vulnerability

Q: Which Ubuntu kernel package variants are identified as affected?

The listed packages are ubuntu/linux, ubuntu/linux-fips, ubuntu/linux-aws, ubuntu/linux-azure, ubuntu/linux-aws-fips, ubuntu/linux-azure-fips, ubuntu/linux-gcp, and ubuntu/linux-gcp-fips.

Q: What traffic-control configuration is relevant to this issue?

The issue concerns teql being used below the root of a qdisc hierarchy. The described triggering layout places teql under a QFQ class, with another class using netem delay.

Q: What can be done if an update cannot be applied immediately?

Avoid using teql as a non-root qdisc. Configure teql only as the root qdisc, which is the stated design intent enforced by the resolution.

Q: How can an administrator identify an exposed configuration?

Review configured traffic-control qdisc hierarchies and check whether any teql instance is attached as a child of another qdisc or class. A teql instance that is not the root qdisc matches the configuration constraint addressed by the fix.

Published Feb 4, 2026

Updated

In the Linux kernel, the following vulnerability has been resolved: net/sched: Enforce that teql can only be used as root qdisc Design intent of teql is that it is only supposed to be used as root qdisc. We need to check for that constraint. Although not important, I will describe the scenario that unearthed this issue for the curious. GangMin Kim <km.kim1503@gmail.com> managed to concot a scenario as follows: ROOT qdisc 1:0 (QFQ) ├── class 1:1 (weight=15, lmax=16384) netem with delay 6.4s └── class 1:2 (weight=1, lmax=1514) teql GangMin sends a packet which is enqueued to 1:1 (netem). Any invocation of dequeue by QFQ from this class will not return a packet until after 6.4s. In the meantime, a second packet is sent and it lands on 1:2. teql's enqueue will return success and this will activate class 1:2. Main issue is that teql only updates the parent visible qlen (sch->q.qlen) at dequeue. Since QFQ will only call dequeue if peek succeeds (and teql's peek always returns NULL), dequeue will never be called and thus the qlen will remain as 0. With that in mind, when GangMin updates 1:2's lmax value, the qfqchangeclass calls qfqdeactrmfromagg. Since the child qdisc's qlen was not incremented, qfq fails to deactivate the class, but still frees its pointers from the aggregate. So when the first packet is rescheduled after 6.4 seconds (netem's delay), a dangling pointer is accessed causing GangMin's causing a UAF.

Affected Software

242 affected componentsFixes available

ubuntu/linux<3.13.0-212.263

3.13.0-212.263

ubuntu/linux-aws<4.4.0-1153.159

4.4.0-1153.159

ubuntu/linux-azure<4.15.0-1199.214~14.04.1

4.15.0-1199.214~14.04.1

ubuntu/linux-lts-xenial<4.4.0-279.313~14.04.1

4.4.0-279.313~14.04.1

ubuntu/linux<4.4.0-279.313

4.4.0-279.313

ubuntu/linux-aws<4.4.0-1191.206

4.4.0-1191.206

ubuntu/linux-aws-hwe<4.15.0-1190.203~16.04.1

4.15.0-1190.203~16.04.1

ubuntu/linux-azure<4.15.0-1200.215~16.04.1

4.15.0-1200.215~16.04.1

ubuntu/linux-gcp<4.15.0-1183.200~16.04.2

4.15.0-1183.200~16.04.2

ubuntu/linux-hwe<4.15.0-248.260~16.04.1

4.15.0-248.260~16.04.1

ubuntu/linux-kvm<4.4.0-1154.165

4.4.0-1154.165

ubuntu/linux-oracle<4.15.0-1153.164~16.04.1

4.15.0-1153.164~16.04.1

ubuntu/linux-hwe-edge*

ubuntu/linux-fips<4.4.0-1123.130

4.4.0-1123.130

ubuntu/linux-fips*

ubuntu/linux<4.15.0-248.260

4.15.0-248.260

ubuntu/linux-aws<4.15.0-1190.203

4.15.0-1190.203

ubuntu/linux-aws-5.0*

ubuntu/linux-aws-5.3*

ubuntu/linux-aws-5.4<5.4.0-1157.167~18.04.1

5.4.0-1157.167~18.04.1

ubuntu/linux-azure*

ubuntu/linux-azure-4.15<4.15.0-1199.214

4.15.0-1199.214

ubuntu/linux-azure-5.3*

ubuntu/linux-azure-5.4<5.4.0-1161.167~18.04.1

5.4.0-1161.167~18.04.1

ubuntu/linux-azure-edge*

ubuntu/linux-gcp*

ubuntu/linux-gcp-4.15<4.15.0-1183.200

4.15.0-1183.200

ubuntu/linux-gcp-5.3*

ubuntu/linux-gcp-5.4<5.4.0-1160.169~18.04.1

5.4.0-1160.169~18.04.1

ubuntu/linux-gke-4.15*

ubuntu/linux-gke-5.4*

ubuntu/linux-gkeop-5.4*

ubuntu/linux-hwe*

ubuntu/linux-hwe-5.4<5.4.0-228.248~18.04.1

5.4.0-228.248~18.04.1

ubuntu/linux-hwe-edge*

ubuntu/linux-ibm-5.4<5.4.0-1103.108~18.04.1

5.4.0-1103.108~18.04.1

ubuntu/linux-kvm<4.15.0-1172.177

4.15.0-1172.177

ubuntu/linux-oem*

ubuntu/linux-oracle<4.15.0-1152.163

4.15.0-1152.163

ubuntu/linux-oracle-5.0*

ubuntu/linux-oracle-5.3*

ubuntu/linux-oracle-5.4<5.4.0-1155.165~18.04.1

5.4.0-1155.165~18.04.1

ubuntu/linux-raspi-5.4<5.4.0-1140.153~18.04.1

5.4.0-1140.153~18.04.1

ubuntu/linux-aws-fips<4.15.0-2128.134

4.15.0-2128.134

ubuntu/linux-azure-fips<4.15.0-2109.115

4.15.0-2109.115

ubuntu/linux-fips<4.15.0-1145.157

4.15.0-1145.157

ubuntu/linux-gcp-fips<4.15.0-2091.97

4.15.0-2091.97

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux<5.4.0-228.248

5.4.0-228.248

ubuntu/linux-aws<5.4.0-1157.167

5.4.0-1157.167

ubuntu/linux-aws-5.11*

ubuntu/linux-aws-5.13*

ubuntu/linux-aws-5.15<5.15.0-1104.111~20.04.1

5.15.0-1104.111~20.04.1

ubuntu/linux-aws-5.8*

ubuntu/linux-azure<5.4.0-1161.167

5.4.0-1161.167

ubuntu/linux-azure-5.11*

ubuntu/linux-azure-5.13*

ubuntu/linux-azure-5.15<5.15.0-1110.119~20.04.1

5.15.0-1110.119~20.04.1

ubuntu/linux-azure-5.8*

ubuntu/linux-azure-fde*

ubuntu/linux-bluefield<5.4.0-1116.123

5.4.0-1116.123

ubuntu/linux-gcp<5.4.0-1160.169

5.4.0-1160.169

ubuntu/linux-gcp-5.11*

ubuntu/linux-gcp-5.13*

ubuntu/linux-gcp-5.15<5.15.0-1104.113~20.04.1

5.15.0-1104.113~20.04.1

ubuntu/linux-gcp-5.8*

ubuntu/linux-gke*

ubuntu/linux-gke-5.15*

ubuntu/linux-gkeop*

ubuntu/linux-gkeop-5.15*

ubuntu/linux-hwe-5.11*

ubuntu/linux-hwe-5.13*

ubuntu/linux-hwe-5.15<5.15.0-176.186~20.04.1

5.15.0-176.186~20.04.1

ubuntu/linux-hwe-5.8*

ubuntu/linux-ibm<5.4.0-1103.108

5.4.0-1103.108

ubuntu/linux-ibm-5.15<5.15.0-1098.101~20.04.1

5.15.0-1098.101~20.04.1

ubuntu/linux-intel-5.13*

ubuntu/linux-intel-iotg-5.15<5.15.0-1099.105~20.04.1

5.15.0-1099.105~20.04.1

ubuntu/linux-iot<5.4.0-1061.64

5.4.0-1061.64

ubuntu/linux-kvm<5.4.0-1144.153

5.4.0-1144.153

ubuntu/linux-lowlatency-hwe-5.15<5.15.0-174.184~20.04.1

5.15.0-174.184~20.04.1

ubuntu/linux-nvidia-tegra-5.15<5.15.0-1057.57~20.04.1

5.15.0-1057.57~20.04.1

ubuntu/linux-oem-5.10*

ubuntu/linux-oem-5.13*

ubuntu/linux-oem-5.6*

ubuntu/linux-oracle<5.4.0-1155.165

5.4.0-1155.165

ubuntu/linux-oracle-5.11*

ubuntu/linux-oracle-5.13*

ubuntu/linux-oracle-5.15<5.15.0-1101.107~20.04.1

5.15.0-1101.107~20.04.1

ubuntu/linux-oracle-5.8*

ubuntu/linux-raspi<5.4.0-1140.153

5.4.0-1140.153

ubuntu/linux-raspi2*

ubuntu/linux-riscv*

ubuntu/linux-riscv-5.11*

ubuntu/linux-riscv-5.15<5.15.0-1098.102~20.04.1

5.15.0-1098.102~20.04.1

ubuntu/linux-riscv-5.8*

ubuntu/linux-xilinx-zynqmp<5.4.0-1075.79

5.4.0-1075.79

ubuntu/linux-aws-fips<5.4.0-1157.167+fips1

5.4.0-1157.167+fips1

ubuntu/linux-azure-fips<5.4.0-1161.167+fips1

5.4.0-1161.167+fips1

ubuntu/linux-fips<5.4.0-1131.141

5.4.0-1131.141

ubuntu/linux-gcp-fips<5.4.0-1160.169+fips1

5.4.0-1160.169+fips1

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux<5.15.0-174.184

5.15.0-174.184

ubuntu/linux-allwinner-5.19*

ubuntu/linux-aws<5.15.0-1104.111

5.15.0-1104.111

ubuntu/linux-aws-5.19*

ubuntu/linux-aws-6.2*

ubuntu/linux-aws-6.5*

ubuntu/linux-aws-6.8<6.8.0-1051.54~22.04.1

6.8.0-1051.54~22.04.1

ubuntu/linux-azure<5.15.0-1109.118

5.15.0-1109.118

ubuntu/linux-azure-5.19*

ubuntu/linux-azure-6.2*

ubuntu/linux-azure-6.5*

ubuntu/linux-azure-6.8<6.8.0-1052.58~22.04.1

6.8.0-1052.58~22.04.1

ubuntu/linux-azure-fde<5.15.0-1109.118.1

5.15.0-1109.118.1

ubuntu/linux-azure-fde-5.19*

ubuntu/linux-azure-fde-6.2*

ubuntu/linux-azure-fde-6.8<6.8.0-1058.65~22.04.1

6.8.0-1058.65~22.04.1

ubuntu/linux-gcp<5.15.0-1104.113

5.15.0-1104.113

ubuntu/linux-gcp-5.19*

ubuntu/linux-gcp-6.2*

ubuntu/linux-gcp-6.5*

ubuntu/linux-gcp-6.8<6.8.0-1053.56~22.04.1

6.8.0-1053.56~22.04.1

ubuntu/linux-gke<5.15.0-1100.106

5.15.0-1100.106

ubuntu/linux-gkeop<5.15.0-1087.95

5.15.0-1087.95

ubuntu/linux-hwe-5.19*

ubuntu/linux-hwe-6.2*

ubuntu/linux-hwe-6.5*

ubuntu/linux-hwe-6.8<6.8.0-107.107~22.04.1

6.8.0-107.107~22.04.1

ubuntu/linux-ibm<5.15.0-1098.101

5.15.0-1098.101

ubuntu/linux-ibm-6.8<6.8.0-1050.50~22.04.1

6.8.0-1050.50~22.04.1

ubuntu/linux-intel-iot-realtime*

ubuntu/linux-intel-iotg<5.15.0-1099.105

5.15.0-1099.105

ubuntu/linux-kvm<5.15.0-1096.101

5.15.0-1096.101

ubuntu/linux-lowlatency<5.15.0-174.184

5.15.0-174.184

ubuntu/linux-lowlatency-hwe-5.19*

ubuntu/linux-lowlatency-hwe-6.2*

ubuntu/linux-lowlatency-hwe-6.5*

ubuntu/linux-lowlatency-hwe-6.8<6.8.0-107.107.1~22.04.1

6.8.0-107.107.1~22.04.1

ubuntu/linux-nvidia<5.15.0-1099.100

5.15.0-1099.100

ubuntu/linux-nvidia-6.2*

ubuntu/linux-nvidia-6.5*

ubuntu/linux-nvidia-6.8<6.8.0-1050.53~22.04.1

6.8.0-1050.53~22.04.1

ubuntu/linux-nvidia-tegra<5.15.0-1056.56

5.15.0-1056.56

ubuntu/linux-nvidia-tegra-igx<5.15.0-1045.45

5.15.0-1045.45

ubuntu/linux-oem-5.17*

ubuntu/linux-oem-6.0*

ubuntu/linux-oem-6.1*

ubuntu/linux-oem-6.5*

ubuntu/linux-oracle<5.15.0-1101.107

5.15.0-1101.107

ubuntu/linux-oracle-6.5*

ubuntu/linux-oracle-6.8<6.8.0-1049.50~22.04.1

6.8.0-1049.50~22.04.1

ubuntu/linux-raspi<5.15.0-1098.101

5.15.0-1098.101

ubuntu/linux-realtime*

ubuntu/linux-riscv*

ubuntu/linux-riscv-5.19*

ubuntu/linux-riscv-6.5*

ubuntu/linux-riscv-6.8<6.8.0-107.107~22.04.1

6.8.0-107.107~22.04.1

ubuntu/linux-starfive-5.19*

ubuntu/linux-starfive-6.2*

ubuntu/linux-starfive-6.5*

ubuntu/linux-xilinx-zynqmp<5.15.0-1068.72

5.15.0-1068.72

ubuntu/linux-bluefield<5.15.0-1087.89

5.15.0-1087.89

ubuntu/linux-intel-iot-realtime<5.15.0-1096.98

5.15.0-1096.98

ubuntu/linux-realtime<5.15.0-1103.112

5.15.0-1103.112

ubuntu/linux-realtime-6.8<6.8.1-1046.47~22.04.2

6.8.1-1046.47~22.04.2

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux-aws-fips<5.15.0-1104.111+fips1

5.15.0-1104.111+fips1

ubuntu/linux-azure-fips<5.15.0-1109.118+fips1

5.15.0-1109.118+fips1

ubuntu/linux-fips<5.15.0-174.184+fips1

5.15.0-174.184+fips1

ubuntu/linux-gcp-fips<5.15.0-1104.113+fips1

5.15.0-1104.113+fips1

ubuntu/linux<6.8.0-107.107

6.8.0-107.107

ubuntu/linux-aws<6.8.0-1051.54

6.8.0-1051.54

ubuntu/linux-aws-6.14*

ubuntu/linux-aws-6.17<6.17.0-1010.10~24.04.1

6.17.0-1010.10~24.04.1

ubuntu/linux-azure<6.8.0-1052.58

6.8.0-1052.58

ubuntu/linux-azure-6.11*

ubuntu/linux-azure-6.14*

ubuntu/linux-azure-6.17<6.17.0-1011.11~24.04.2

6.17.0-1011.11~24.04.2

ubuntu/linux-azure-fde<6.8.0-1058.65

6.8.0-1058.65

ubuntu/linux-azure-fde-6.14*

ubuntu/linux-azure-nvidia<6.8.0-1039.42

6.8.0-1039.42

ubuntu/linux-azure-nvidia-6.14*

ubuntu/linux-gcp<6.8.0-1053.56

6.8.0-1053.56

ubuntu/linux-gcp-6.11*

ubuntu/linux-gcp-6.14*

ubuntu/linux-gcp-6.17<6.17.0-1010.10~24.04.1

6.17.0-1010.10~24.04.1

ubuntu/linux-gke<6.8.0-1049.54

6.8.0-1049.54

ubuntu/linux-gkeop<6.8.0-1036.39

6.8.0-1036.39

ubuntu/linux-hwe-6.11*

ubuntu/linux-hwe-6.14*

ubuntu/linux-hwe-6.17<6.17.0-20.20~24.04.1

6.17.0-20.20~24.04.1

ubuntu/linux-ibm<6.8.0-1050.50

6.8.0-1050.50

ubuntu/linux-lowlatency<6.8.0-107.107.1

6.8.0-107.107.1

ubuntu/linux-lowlatency-hwe-6.11*

ubuntu/linux-nvidia<6.8.0-1050.53

6.8.0-1050.53

ubuntu/linux-nvidia-6.11*

ubuntu/linux-nvidia-6.17<6.17.0-1018.18

6.17.0-1018.18

ubuntu/linux-nvidia-lowlatency<6.8.0-1050.53.1

6.8.0-1050.53.1

ubuntu/linux-nvidia-tegra<6.8.0-1021.21

6.8.0-1021.21

ubuntu/linux-oem-6.11*

ubuntu/linux-oem-6.14*

ubuntu/linux-oem-6.17<6.17.0-1017.17

6.17.0-1017.17

ubuntu/linux-oem-6.8*

ubuntu/linux-oracle<6.8.0-1049.50

6.8.0-1049.50

ubuntu/linux-oracle-6.14*

ubuntu/linux-oracle-6.17<6.17.0-1010.10~24.04.1

6.17.0-1010.10~24.04.1

ubuntu/linux-raspi<6.8.0-1051.55

6.8.0-1051.55

ubuntu/linux-raspi-realtime*

ubuntu/linux-realtime*

ubuntu/linux-riscv*

ubuntu/linux-riscv-6.14*

ubuntu/linux-riscv-6.17<6.17.0-20.20.1~24.04.1

6.17.0-20.20.1~24.04.1

ubuntu/linux-xilinx<6.8.0-1028.29

6.8.0-1028.29

ubuntu/linux-bluefield<6.8.0-1017.21

6.8.0-1017.21

ubuntu/linux-raspi-realtime<6.8.0-2041.42

6.8.0-2041.42

ubuntu/linux-realtime<6.8.1-1046.47

6.8.1-1046.47

ubuntu/linux-realtime-6.14*

ubuntu/linux-realtime-6.17<6.17.0-1009.10~24.04.1

6.17.0-1009.10~24.04.1

ubuntu/linux-aws-fips<6.8.0-1051.54+fips1

6.8.0-1051.54+fips1

ubuntu/linux-azure-fips<6.8.0-1052.58+fips1

6.8.0-1052.58+fips1

ubuntu/linux-fips<6.8.0-107.107+fips1

6.8.0-107.107+fips1

ubuntu/linux-gcp-fips<6.8.0-1053.56+fips1

6.8.0-1053.56+fips1

ubuntu/linux<6.17.0-20.20

6.17.0-20.20

ubuntu/linux-aws<6.17.0-1010.10

6.17.0-1010.10

ubuntu/linux-azure<6.17.0-1011.11

6.17.0-1011.11

ubuntu/linux-azure-fde*

ubuntu/linux-gcp<6.17.0-1010.10

6.17.0-1010.10

ubuntu/linux-oracle<6.17.0-1010.10

6.17.0-1010.10

ubuntu/linux-raspi<6.17.0-1011.11

6.17.0-1011.11

ubuntu/linux-realtime<6.17.0-1009.10

6.17.0-1009.10

ubuntu/linux-riscv<6.17.0-20.20.1

6.17.0-20.20.1

ubuntu/linux-vmware*

Remediation

Recommended actions to resolve this vulnerability, in priority order.

Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 3.13.0-212.263
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 4.4.0-1153.159
Upgrade
Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 4.15.0-1199.214~14.04.1
Upgrade
Upgrade ubuntu/linux-lts-xenial to a version that resolves this vulnerability.
Fixed in 4.4.0-279.313~14.04.1
Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 4.4.0-279.313
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 4.4.0-1191.206
Upgrade
Upgrade ubuntu/linux-aws-hwe to a version that resolves this vulnerability.
Fixed in 4.15.0-1190.203~16.04.1
Upgrade
Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 4.15.0-1200.215~16.04.1
Upgrade
Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.
Fixed in 4.15.0-1183.200~16.04.2
Upgrade
Upgrade ubuntu/linux-hwe to a version that resolves this vulnerability.
Fixed in 4.15.0-248.260~16.04.1
Upgrade
Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.
Fixed in 4.4.0-1154.165
Upgrade
Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 4.15.0-1153.164~16.04.1
Upgrade
Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.
Fixed in 4.4.0-1123.130
Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 4.15.0-248.260
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 4.15.0-1190.203
Upgrade
Upgrade ubuntu/linux-aws-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1157.167~18.04.1
Upgrade
Upgrade ubuntu/linux-azure-4.15 to a version that resolves this vulnerability.
Fixed in 4.15.0-1199.214
Upgrade
Upgrade ubuntu/linux-azure-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1161.167~18.04.1
Upgrade
Upgrade ubuntu/linux-gcp-4.15 to a version that resolves this vulnerability.
Fixed in 4.15.0-1183.200
Upgrade
Upgrade ubuntu/linux-gcp-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1160.169~18.04.1
Upgrade
Upgrade ubuntu/linux-hwe-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-228.248~18.04.1
Upgrade
Upgrade ubuntu/linux-ibm-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1103.108~18.04.1
Upgrade
Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.
Fixed in 4.15.0-1172.177
Upgrade
Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 4.15.0-1152.163
Upgrade
Upgrade ubuntu/linux-oracle-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1155.165~18.04.1
Upgrade
Upgrade ubuntu/linux-raspi-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1140.153~18.04.1
Upgrade
Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.
Fixed in 4.15.0-2128.134
Upgrade
Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.
Fixed in 4.15.0-2109.115
Upgrade
Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.
Fixed in 4.15.0-1145.157
Upgrade
Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.
Fixed in 4.15.0-2091.97
Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 5.4.0-228.248
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 5.4.0-1157.167
Upgrade
Upgrade ubuntu/linux-aws-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1104.111~20.04.1
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Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 5.4.0-1161.167
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Upgrade ubuntu/linux-azure-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1110.119~20.04.1
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Upgrade ubuntu/linux-bluefield to a version that resolves this vulnerability.
Fixed in 5.4.0-1116.123
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Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.
Fixed in 5.4.0-1160.169
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Upgrade ubuntu/linux-gcp-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1104.113~20.04.1
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Fixed in 5.15.0-176.186~20.04.1
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Fixed in 5.4.0-1103.108
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Upgrade ubuntu/linux-ibm-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1098.101~20.04.1
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Upgrade ubuntu/linux-intel-iotg-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1099.105~20.04.1
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Upgrade ubuntu/linux-iot to a version that resolves this vulnerability.
Fixed in 5.4.0-1061.64
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Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.
Fixed in 5.4.0-1144.153
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Fixed in 5.15.0-174.184~20.04.1
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Fixed in 5.15.0-1057.57~20.04.1
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Fixed in 5.4.0-1155.165
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Fixed in 5.15.0-1101.107~20.04.1
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Fixed in 5.4.0-1140.153
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Fixed in 5.15.0-1098.102~20.04.1
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Fixed in 5.4.0-1075.79
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Fixed in 5.4.0-1157.167+fips1
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Fixed in 5.4.0-1161.167+fips1
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Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.
Fixed in 5.4.0-1131.141
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Fixed in 5.4.0-1160.169+fips1
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Fixed in 5.15.0-174.184
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Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 5.15.0-1104.111
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Fixed in 6.8.0-1051.54~22.04.1
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Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 5.15.0-1109.118
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Fixed in 6.8.0-1052.58~22.04.1
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Fixed in 5.15.0-1109.118.1
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Fixed in 6.8.0-1058.65~22.04.1
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Fixed in 5.15.0-1104.113
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Fixed in 6.8.0-1053.56~22.04.1
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Fixed in 5.15.0-1100.106
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Fixed in 5.15.0-1087.95
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Fixed in 6.8.0-107.107~22.04.1
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Fixed in 5.15.0-1098.101
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Fixed in 6.8.0-1050.50~22.04.1
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Fixed in 5.15.0-1099.105
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Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.
Fixed in 5.15.0-1096.101
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Upgrade ubuntu/linux-lowlatency to a version that resolves this vulnerability.
Fixed in 5.15.0-174.184
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Fixed in 6.8.0-107.107.1~22.04.1
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Fixed in 5.15.0-1099.100
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Fixed in 6.8.0-1050.53~22.04.1
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Fixed in 5.15.0-1056.56
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Fixed in 5.15.0-1045.45
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Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 5.15.0-1101.107
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Fixed in 6.8.0-1049.50~22.04.1
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Upgrade ubuntu/linux-raspi to a version that resolves this vulnerability.
Fixed in 5.15.0-1098.101
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Fixed in 6.8.0-107.107~22.04.1
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Upgrade ubuntu/linux-xilinx-zynqmp to a version that resolves this vulnerability.
Fixed in 5.15.0-1068.72
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Fixed in 5.15.0-1087.89
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Fixed in 5.15.0-1096.98
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Upgrade ubuntu/linux-realtime to a version that resolves this vulnerability.
Fixed in 5.15.0-1103.112
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Upgrade ubuntu/linux-realtime-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.1-1046.47~22.04.2
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Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.
Fixed in 5.15.0-1104.111+fips1
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Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.
Fixed in 5.15.0-1109.118+fips1
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Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.
Fixed in 5.15.0-174.184+fips1
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Fixed in 5.15.0-1104.113+fips1
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Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 6.8.0-107.107
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Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 6.8.0-1051.54
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Upgrade ubuntu/linux-aws-6.17 to a version that resolves this vulnerability.
Fixed in 6.17.0-1010.10~24.04.1
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Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 6.8.0-1052.58
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Upgrade ubuntu/linux-azure-6.17 to a version that resolves this vulnerability.
Fixed in 6.17.0-1011.11~24.04.2
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Upgrade ubuntu/linux-azure-fde to a version that resolves this vulnerability.
Fixed in 6.8.0-1058.65
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Fixed in 6.8.0-1039.42
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Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.
Fixed in 6.8.0-1053.56
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Upgrade ubuntu/linux-gcp-6.17 to a version that resolves this vulnerability.
Fixed in 6.17.0-1010.10~24.04.1
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Upgrade ubuntu/linux-gke to a version that resolves this vulnerability.
Fixed in 6.8.0-1049.54
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Upgrade ubuntu/linux-gkeop to a version that resolves this vulnerability.
Fixed in 6.8.0-1036.39
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Fixed in 6.17.0-20.20~24.04.1
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Fixed in 6.8.0-1050.50
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Upgrade ubuntu/linux-lowlatency to a version that resolves this vulnerability.
Fixed in 6.8.0-107.107.1
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Upgrade ubuntu/linux-nvidia to a version that resolves this vulnerability.
Fixed in 6.8.0-1050.53
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Upgrade ubuntu/linux-nvidia-6.17 to a version that resolves this vulnerability.
Fixed in 6.17.0-1018.18
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Upgrade ubuntu/linux-nvidia-lowlatency to a version that resolves this vulnerability.
Fixed in 6.8.0-1050.53.1
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Fixed in 6.8.0-1021.21
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Fixed in 6.17.0-1017.17
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Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 6.8.0-1049.50
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Fixed in 6.17.0-1010.10~24.04.1
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Fixed in 6.8.0-1051.55
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Fixed in 6.17.0-20.20.1~24.04.1
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Fixed in 6.8.0-1028.29
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Fixed in 6.8.0-1017.21
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Upgrade ubuntu/linux-raspi-realtime to a version that resolves this vulnerability.
Fixed in 6.8.0-2041.42
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Upgrade ubuntu/linux-realtime to a version that resolves this vulnerability.
Fixed in 6.8.1-1046.47
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Upgrade ubuntu/linux-realtime-6.17 to a version that resolves this vulnerability.
Fixed in 6.17.0-1009.10~24.04.1
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Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.
Fixed in 6.8.0-1051.54+fips1
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Fixed in 6.8.0-1052.58+fips1
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Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.
Fixed in 6.8.0-107.107+fips1
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Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.
Fixed in 6.8.0-1053.56+fips1
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Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 6.17.0-20.20
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Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 6.17.0-1010.10
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Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 6.17.0-1011.11
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Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.
Fixed in 6.17.0-1010.10
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Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 6.17.0-1010.10
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Upgrade ubuntu/linux-raspi to a version that resolves this vulnerability.
Fixed in 6.17.0-1011.11
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Upgrade ubuntu/linux-realtime to a version that resolves this vulnerability.
Fixed in 6.17.0-1009.10
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Upgrade ubuntu/linux-riscv to a version that resolves this vulnerability.
Fixed in 6.17.0-20.20.1
Configuration
Use teql only as the root qdisc; do not attach it as a child qdisc.
teql qdisc placement = root qdisc only

Event History

Feb 4, 2026

CVE Published

via OSV·05:16 PM

Data Sourced

via OSV·05:16 PM

DescriptionSeverityAffected Software

Frequently Asked Questions

Which Ubuntu kernel package variants are identified as affected?

The listed packages are ubuntu/linux, ubuntu/linux-fips, ubuntu/linux-aws, ubuntu/linux-azure, ubuntu/linux-aws-fips, ubuntu/linux-azure-fips, ubuntu/linux-gcp, and ubuntu/linux-gcp-fips.

What traffic-control configuration is relevant to this issue?

The issue concerns teql being used below the root of a qdisc hierarchy. The described triggering layout places teql under a QFQ class, with another class using netem delay.

What can be done if an update cannot be applied immediately?

Avoid using teql as a non-root qdisc. Configure teql only as the root qdisc, which is the stated design intent enforced by the resolution.

How can an administrator identify an exposed configuration?

Review configured traffic-control qdisc hierarchies and check whether any teql instance is attached as a child of another qdisc or class. A teql instance that is not the root qdisc matches the configuration constraint addressed by the fix.

UBUNTU-CVE-2026-23074: High severity ubuntu/linux vulnerability

Affected Software

Remediation

Event History

Frequently Asked Questions

Which Ubuntu kernel package variants are identified as affected?

What traffic-control configuration is relevant to this issue?

What can be done if an update cannot be applied immediately?

How can an administrator identify an exposed configuration?

Company

Resources

Contact

Frequently Asked Questions

Which Ubuntu kernel package variants are identified as affected?

What traffic-control configuration is relevant to this issue?

What can be done if an update cannot be applied immediately?

How can an administrator identify an exposed configuration?