UBUNTU-CVE-2025-37838: Use After Free

Q: Who is exposed to this issue?

Systems using the affected Ubuntu Linux kernel packages are exposed when the HSI ssi_protocol driver is present and its module can be removed while its transmit work is running. The listed packages include linux, linux-aws-fips, linux-azure-fips, linux-fips, linux-gcp-fips, linux-azure, linux-gcp, and linux-oracle.

Q: What does an attacker need to exploit the vulnerability?

The severity vector indicates local access, low attack complexity, low privileges, and no user interaction. Exploitation requires triggering the race between queued ssi_protocol transmit work and removal of the ssi_protocol module.

Q: What is the impact if the race is triggered?

The race causes a use-after-free condition: the driver state can be freed during module removal and then accessed by transmit work. The provided severity vector rates confidentiality, integrity, and availability impact as high.

Q: What can be done if an updated kernel cannot be deployed immediately?

Avoid removing the ssi_protocol module while its transmit work may be active. The upstream fix cancels the work before cleanup in ssi_protocol_remove(), preventing the freed driver state from being used.

Published Apr 18, 2025

Updated

In the Linux kernel, the following vulnerability has been resolved: HSI: ssiprotocol: Fix use after free vulnerability in ssiprotocol Driver Due to Race Condition In the ssiprotocolprobe() function, &ssi->work is bound with ssipxmitwork(), In ssippnsetup(), the ssippnxmit() function within the ssippnops structure is capable of starting the work. If we remove the module which will call ssiprotocolremove() to make a cleanup, it will free ssi through kfree(ssi), while the work mentioned above will be used. The sequence of operations that may lead to a UAF bug is as follows: CPU0 CPU1 | ssipxmitwork ssiprotocolremove | kfree(ssi); | | struct hsiclient cl = ssi->cl; | // use ssi Fix it by ensuring that the work is canceled before proceeding with the cleanup in ssiprotocolremove().

Affected Software

208 affected componentsFixes available

ubuntu/linux-azure<4.15.0-1194.209~14.04.1

4.15.0-1194.209~14.04.1

ubuntu/linux-aws-hwe<4.15.0-1186.199~16.04.1

4.15.0-1186.199~16.04.1

ubuntu/linux-azure<4.15.0-1194.209~16.04.1

4.15.0-1194.209~16.04.1

ubuntu/linux-gcp<4.15.0-1179.196~16.04.1

4.15.0-1179.196~16.04.1

ubuntu/linux-hwe<4.15.0-243.255~16.04.1

4.15.0-243.255~16.04.1

ubuntu/linux-oracle<4.15.0-1148.159~16.04.1

4.15.0-1148.159~16.04.1

ubuntu/linux-hwe-edge*

ubuntu/linux<4.15.0-243.255

4.15.0-243.255

ubuntu/linux-aws<4.15.0-1186.199

4.15.0-1186.199

ubuntu/linux-aws-5.0*

ubuntu/linux-aws-5.3*

ubuntu/linux-aws-5.4<5.4.0-1152.162~18.04.1

5.4.0-1152.162~18.04.1

ubuntu/linux-azure*

ubuntu/linux-azure-4.15<4.15.0-1194.209

4.15.0-1194.209

ubuntu/linux-azure-5.3*

ubuntu/linux-azure-5.4<5.4.0-1156.163~18.04.1

5.4.0-1156.163~18.04.1

ubuntu/linux-azure-edge*

ubuntu/linux-gcp*

ubuntu/linux-gcp-4.15<4.15.0-1179.196

4.15.0-1179.196

ubuntu/linux-gcp-5.3*

ubuntu/linux-gcp-5.4<5.4.0-1155.164~18.04.1

5.4.0-1155.164~18.04.1

ubuntu/linux-gke-4.15*

ubuntu/linux-gke-5.4*

ubuntu/linux-gkeop-5.4*

ubuntu/linux-hwe*

ubuntu/linux-hwe-5.4<5.4.0-223.243~18.04.1

5.4.0-223.243~18.04.1

ubuntu/linux-hwe-edge*

ubuntu/linux-ibm-5.4<5.4.0-1098.103~18.04.1

5.4.0-1098.103~18.04.1

ubuntu/linux-kvm<4.15.0-1168.173

4.15.0-1168.173

ubuntu/linux-oem*

ubuntu/linux-oracle<4.15.0-1148.159

4.15.0-1148.159

ubuntu/linux-oracle-5.0*

ubuntu/linux-oracle-5.3*

ubuntu/linux-oracle-5.4<5.4.0-1150.160~18.04.1

5.4.0-1150.160~18.04.1

ubuntu/linux-raspi-5.4<5.4.0-1135.148~18.04.1

5.4.0-1135.148~18.04.1

ubuntu/linux-aws-fips<4.15.0-2124.130

4.15.0-2124.130

ubuntu/linux-azure-fips<4.15.0-2104.110

4.15.0-2104.110

ubuntu/linux-fips<4.15.0-1141.153

4.15.0-1141.153

ubuntu/linux-gcp-fips<4.15.0-2087.93

4.15.0-2087.93

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux<5.4.0-223.243

5.4.0-223.243

ubuntu/linux-aws<5.4.0-1152.162

5.4.0-1152.162

ubuntu/linux-aws-5.11*

ubuntu/linux-aws-5.13*

ubuntu/linux-aws-5.15<5.15.0-1088.95~20.04.1

5.15.0-1088.95~20.04.1

ubuntu/linux-aws-5.8*

ubuntu/linux-azure<5.4.0-1156.163

5.4.0-1156.163

ubuntu/linux-azure-5.11*

ubuntu/linux-azure-5.13*

ubuntu/linux-azure-5.15<5.15.0-1094.103~20.04.1

5.15.0-1094.103~20.04.1

ubuntu/linux-azure-5.8*

ubuntu/linux-azure-fde*

ubuntu/linux-bluefield<5.4.0-1111.118

5.4.0-1111.118

ubuntu/linux-gcp<5.4.0-1155.164

5.4.0-1155.164

ubuntu/linux-gcp-5.11*

ubuntu/linux-gcp-5.13*

ubuntu/linux-gcp-5.15<5.15.0-1087.96~20.04.2

5.15.0-1087.96~20.04.2

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<5.15.0-144.157~20.04.1

5.15.0-144.157~20.04.1

ubuntu/linux-hwe-5.8*

ubuntu/linux-ibm<5.4.0-1098.103

5.4.0-1098.103

ubuntu/linux-ibm-5.15<5.15.0-1080.83~20.04.1

5.15.0-1080.83~20.04.1

ubuntu/linux-intel-5.13*

ubuntu/linux-intel-iotg-5.15<5.15.0-1083.89~20.04.1

5.15.0-1083.89~20.04.1

ubuntu/linux-iot<5.4.0-1056.59

5.4.0-1056.59

ubuntu/linux-kvm<5.4.0-1139.148

5.4.0-1139.148

ubuntu/linux-lowlatency-hwe-5.15<5.15.0-144.157~20.04.1

5.15.0-144.157~20.04.1

ubuntu/linux-nvidia-tegra-5.15<5.15.0-1041.41~20.04.1

5.15.0-1041.41~20.04.1

ubuntu/linux-oem-5.10*

ubuntu/linux-oem-5.13*

ubuntu/linux-oem-5.6*

ubuntu/linux-oracle<5.4.0-1150.160

5.4.0-1150.160

ubuntu/linux-oracle-5.11*

ubuntu/linux-oracle-5.13*

ubuntu/linux-oracle-5.15<5.15.0-1085.91~20.04.3

5.15.0-1085.91~20.04.3

ubuntu/linux-oracle-5.8*

ubuntu/linux-raspi<5.4.0-1135.148

5.4.0-1135.148

ubuntu/linux-raspi2*

ubuntu/linux-riscv*

ubuntu/linux-riscv-5.11*

ubuntu/linux-riscv-5.15<5.15.0-1083.87~20.04.1

5.15.0-1083.87~20.04.1

ubuntu/linux-riscv-5.8*

ubuntu/linux-xilinx-zynqmp<5.4.0-1070.74

5.4.0-1070.74

ubuntu/linux-aws-fips<5.4.0-1152.162+fips1

5.4.0-1152.162+fips1

ubuntu/linux-azure-fips<5.4.0-1157.164+fips1

5.4.0-1157.164+fips1

ubuntu/linux-fips<5.4.0-1126.136

5.4.0-1126.136

ubuntu/linux-gcp-fips<5.4.0-1155.164+fips1

5.4.0-1155.164+fips1

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux<5.15.0-144.157

5.15.0-144.157

ubuntu/linux-allwinner-5.19*

ubuntu/linux-aws<5.15.0-1088.95

5.15.0-1088.95

ubuntu/linux-aws-5.19*

ubuntu/linux-aws-6.2*

ubuntu/linux-aws-6.5*

ubuntu/linux-aws-6.8<6.8.0-1042.44~22.04.1

6.8.0-1042.44~22.04.1

ubuntu/linux-azure<5.15.0-1094.103

5.15.0-1094.103

ubuntu/linux-azure-5.19*

ubuntu/linux-azure-6.2*

ubuntu/linux-azure-6.5*

ubuntu/linux-azure-6.8<6.8.0-1044.50~22.04.1

6.8.0-1044.50~22.04.1

ubuntu/linux-azure-fde<5.15.0-1094.103.1

5.15.0-1094.103.1

ubuntu/linux-azure-fde-5.19*

ubuntu/linux-azure-fde-6.2*

ubuntu/linux-azure-fde-6.8<6.8.0-1046.53~22.04.1

6.8.0-1046.53~22.04.1

ubuntu/linux-gcp<5.15.0-1087.96

5.15.0-1087.96

ubuntu/linux-gcp-5.19*

ubuntu/linux-gcp-6.2*

ubuntu/linux-gcp-6.5*

ubuntu/linux-gcp-6.8<6.8.0-1043.46~22.04.1

6.8.0-1043.46~22.04.1

ubuntu/linux-gke<5.15.0-1085.91

5.15.0-1085.91

ubuntu/linux-gkeop<5.15.0-1070.78

5.15.0-1070.78

ubuntu/linux-hwe-5.19*

ubuntu/linux-hwe-6.2*

ubuntu/linux-hwe-6.5*

ubuntu/linux-hwe-6.8<6.8.0-87.88~22.04.1

6.8.0-87.88~22.04.1

ubuntu/linux-ibm<5.15.0-1080.83

5.15.0-1080.83

ubuntu/linux-ibm-6.8<6.8.0-1040.40~22.04.1

6.8.0-1040.40~22.04.1

ubuntu/linux-intel-iot-realtime*

ubuntu/linux-intel-iotg<5.15.0-1083.89

5.15.0-1083.89

ubuntu/linux-kvm<5.15.0-1084.89

5.15.0-1084.89

ubuntu/linux-lowlatency<5.15.0-144.157

5.15.0-144.157

ubuntu/linux-lowlatency-hwe-5.19*

ubuntu/linux-lowlatency-hwe-6.2*

ubuntu/linux-lowlatency-hwe-6.5*

ubuntu/linux-lowlatency-hwe-6.8<6.8.0-87.88.1~22.04.1

6.8.0-87.88.1~22.04.1

ubuntu/linux-nvidia<5.15.0-1082.83

5.15.0-1082.83

ubuntu/linux-nvidia-6.2*

ubuntu/linux-nvidia-6.5*

ubuntu/linux-nvidia-6.8<6.8.0-1042.45~22.04.1

6.8.0-1042.45~22.04.1

ubuntu/linux-nvidia-tegra<5.15.0-1041.41

5.15.0-1041.41

ubuntu/linux-nvidia-tegra-igx<5.15.0-1030.30

5.15.0-1030.30

ubuntu/linux-oem-5.17*

ubuntu/linux-oem-6.0*

ubuntu/linux-oem-6.1*

ubuntu/linux-oem-6.5*

ubuntu/linux-oracle<5.15.0-1085.91

5.15.0-1085.91

ubuntu/linux-oracle-6.5*

ubuntu/linux-oracle-6.8<6.8.0-1039.40~22.04.1

6.8.0-1039.40~22.04.1

ubuntu/linux-raspi<5.15.0-1083.86

5.15.0-1083.86

ubuntu/linux-realtime*

ubuntu/linux-riscv*

ubuntu/linux-riscv-5.19*

ubuntu/linux-riscv-6.5*

ubuntu/linux-riscv-6.8<6.8.0-87.88~22.04.1

6.8.0-87.88~22.04.1

ubuntu/linux-starfive-5.19*

ubuntu/linux-starfive-6.2*

ubuntu/linux-starfive-6.5*

ubuntu/linux-xilinx-zynqmp<5.15.0-1052.56

5.15.0-1052.56

ubuntu/linux-bluefield<5.15.0-1072.74

5.15.0-1072.74

ubuntu/linux-intel-iot-realtime<5.15.0-1081.83

5.15.0-1081.83

ubuntu/linux-realtime<5.15.0-1088.97

5.15.0-1088.97

ubuntu/linux-realtime-6.8<6.8.1-1037.38~22.04.1

6.8.1-1037.38~22.04.1

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux-aws-fips<5.15.0-1088.95+fips1

5.15.0-1088.95+fips1

ubuntu/linux-azure-fips<5.15.0-1094.103+fips1

5.15.0-1094.103+fips1

ubuntu/linux-fips<5.15.0-144.157+fips1

5.15.0-144.157+fips1

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

5.15.0-1087.96+fips1

ubuntu/linux<6.8.0-87.88

6.8.0-87.88

ubuntu/linux-aws<6.8.0-1042.44

6.8.0-1042.44

ubuntu/linux-azure<6.8.0-1044.50

6.8.0-1044.50

ubuntu/linux-azure-6.11*

ubuntu/linux-azure-fde<6.8.0-1046.53

6.8.0-1046.53

ubuntu/linux-azure-nvidia<6.8.0-1029.32

6.8.0-1029.32

ubuntu/linux-gcp<6.8.0-1043.46

6.8.0-1043.46

ubuntu/linux-gcp-6.11*

ubuntu/linux-gke<6.8.0-1039.44

6.8.0-1039.44

ubuntu/linux-gkeop<6.8.0-1026.29

6.8.0-1026.29

ubuntu/linux-hwe-6.11*

ubuntu/linux-ibm<6.8.0-1040.40

6.8.0-1040.40

ubuntu/linux-intel*

ubuntu/linux-lowlatency<6.8.0-87.88.1

6.8.0-87.88.1

ubuntu/linux-lowlatency-hwe-6.11*

ubuntu/linux-nvidia<6.8.0-1042.45

6.8.0-1042.45

ubuntu/linux-nvidia-6.11*

ubuntu/linux-nvidia-lowlatency<6.8.0-1042.45.1

6.8.0-1042.45.1

ubuntu/linux-nvidia-tegra<6.8.0-1012.12

6.8.0-1012.12

ubuntu/linux-oem-6.11*

ubuntu/linux-oem-6.8*

ubuntu/linux-oracle<6.8.0-1039.40

6.8.0-1039.40

ubuntu/linux-raspi<6.8.0-1042.46

6.8.0-1042.46

ubuntu/linux-raspi-realtime*

ubuntu/linux-realtime*

ubuntu/linux-riscv*

ubuntu/linux-xilinx<6.8.0-1019.20

6.8.0-1019.20

ubuntu/linux-bluefield<6.8.0-1013.17

6.8.0-1013.17

ubuntu/linux-raspi-realtime<6.8.0-2033.34

6.8.0-2033.34

ubuntu/linux-realtime<6.8.1-1037.38

6.8.1-1037.38

ubuntu/linux-aws-fips<6.8.0-1042.44+fips1

6.8.0-1042.44+fips1

ubuntu/linux-azure-fips<6.8.0-1044.50+fips1

6.8.0-1044.50+fips1

ubuntu/linux-fips<6.8.0-87.88+fips1

6.8.0-87.88+fips1

ubuntu/linux-gcp-fips<6.8.0-1043.46+fips1

6.8.0-1043.46+fips1

ubuntu/linux-azure-fde*

ubuntu/linux-vmware*

Remediation

Recommended actions to resolve this vulnerability, in priority order.

Upgrade
Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 4.15.0-1194.209~14.04.1
Upgrade
Upgrade ubuntu/linux-aws-hwe to a version that resolves this vulnerability.
Fixed in 4.15.0-1186.199~16.04.1
Upgrade
Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 4.15.0-1194.209~16.04.1
Upgrade
Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.
Fixed in 4.15.0-1179.196~16.04.1
Upgrade
Upgrade ubuntu/linux-hwe to a version that resolves this vulnerability.
Fixed in 4.15.0-243.255~16.04.1
Upgrade
Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 4.15.0-1148.159~16.04.1
Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 4.15.0-243.255
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 4.15.0-1186.199
Upgrade
Upgrade ubuntu/linux-aws-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1152.162~18.04.1
Upgrade
Upgrade ubuntu/linux-azure-4.15 to a version that resolves this vulnerability.
Fixed in 4.15.0-1194.209
Upgrade
Upgrade ubuntu/linux-azure-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1156.163~18.04.1
Upgrade
Upgrade ubuntu/linux-gcp-4.15 to a version that resolves this vulnerability.
Fixed in 4.15.0-1179.196
Upgrade
Upgrade ubuntu/linux-gcp-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1155.164~18.04.1
Upgrade
Upgrade ubuntu/linux-hwe-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-223.243~18.04.1
Upgrade
Upgrade ubuntu/linux-ibm-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1098.103~18.04.1
Upgrade
Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.
Fixed in 4.15.0-1168.173
Upgrade
Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 4.15.0-1148.159
Upgrade
Upgrade ubuntu/linux-oracle-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1150.160~18.04.1
Upgrade
Upgrade ubuntu/linux-raspi-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1135.148~18.04.1
Upgrade
Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.
Fixed in 4.15.0-2124.130
Upgrade
Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.
Fixed in 4.15.0-2104.110
Upgrade
Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.
Fixed in 4.15.0-1141.153
Upgrade
Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.
Fixed in 4.15.0-2087.93
Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 5.4.0-223.243
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 5.4.0-1152.162
Upgrade
Upgrade ubuntu/linux-aws-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1088.95~20.04.1
Upgrade
Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 5.4.0-1156.163
Upgrade
Upgrade ubuntu/linux-azure-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1094.103~20.04.1
Upgrade
Upgrade ubuntu/linux-bluefield to a version that resolves this vulnerability.
Fixed in 5.4.0-1111.118
Upgrade
Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.
Fixed in 5.4.0-1155.164
Upgrade
Upgrade ubuntu/linux-gcp-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1087.96~20.04.2
Upgrade
Upgrade ubuntu/linux-hwe-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-144.157~20.04.1
Upgrade
Upgrade ubuntu/linux-ibm to a version that resolves this vulnerability.
Fixed in 5.4.0-1098.103
Upgrade
Upgrade ubuntu/linux-ibm-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1080.83~20.04.1
Upgrade
Upgrade ubuntu/linux-intel-iotg-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1083.89~20.04.1
Upgrade
Upgrade ubuntu/linux-iot to a version that resolves this vulnerability.
Fixed in 5.4.0-1056.59
Upgrade
Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.
Fixed in 5.4.0-1139.148
Upgrade
Upgrade ubuntu/linux-lowlatency-hwe-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-144.157~20.04.1
Upgrade
Upgrade ubuntu/linux-nvidia-tegra-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1041.41~20.04.1
Upgrade
Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 5.4.0-1150.160
Upgrade
Upgrade ubuntu/linux-oracle-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1085.91~20.04.3
Upgrade
Upgrade ubuntu/linux-raspi to a version that resolves this vulnerability.
Fixed in 5.4.0-1135.148
Upgrade
Upgrade ubuntu/linux-riscv-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1083.87~20.04.1
Upgrade
Upgrade ubuntu/linux-xilinx-zynqmp to a version that resolves this vulnerability.
Fixed in 5.4.0-1070.74
Upgrade
Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.
Fixed in 5.4.0-1152.162+fips1
Upgrade
Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.
Fixed in 5.4.0-1157.164+fips1
Upgrade
Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.
Fixed in 5.4.0-1126.136
Upgrade
Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.
Fixed in 5.4.0-1155.164+fips1
Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 5.15.0-144.157
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 5.15.0-1088.95
Upgrade
Upgrade ubuntu/linux-aws-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-1042.44~22.04.1
Upgrade
Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 5.15.0-1094.103
Upgrade
Upgrade ubuntu/linux-azure-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-1044.50~22.04.1
Upgrade
Upgrade ubuntu/linux-azure-fde to a version that resolves this vulnerability.
Fixed in 5.15.0-1094.103.1
Upgrade
Upgrade ubuntu/linux-azure-fde-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-1046.53~22.04.1
Upgrade
Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.
Fixed in 5.15.0-1087.96
Upgrade
Upgrade ubuntu/linux-gcp-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-1043.46~22.04.1
Upgrade
Upgrade ubuntu/linux-gke to a version that resolves this vulnerability.
Fixed in 5.15.0-1085.91
Upgrade
Upgrade ubuntu/linux-gkeop to a version that resolves this vulnerability.
Fixed in 5.15.0-1070.78
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Fixed in 6.8.0-87.88~22.04.1
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Fixed in 5.15.0-1080.83
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Fixed in 6.8.0-1040.40~22.04.1
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Fixed in 5.15.0-1083.89
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Fixed in 5.15.0-1084.89
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Fixed in 5.15.0-144.157
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Fixed in 6.8.0-87.88.1~22.04.1
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Fixed in 5.15.0-1082.83
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Fixed in 6.8.0-1042.45~22.04.1
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Fixed in 5.15.0-1041.41
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Fixed in 5.15.0-1030.30
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Fixed in 5.15.0-1085.91
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Fixed in 6.8.0-1039.40~22.04.1
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Fixed in 5.15.0-1083.86
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Fixed in 6.8.0-87.88~22.04.1
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Fixed in 5.15.0-1052.56
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Fixed in 5.15.0-1072.74
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Fixed in 5.15.0-1081.83
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Fixed in 5.15.0-1088.97
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Fixed in 6.8.1-1037.38~22.04.1
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Fixed in 5.15.0-1088.95+fips1
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Fixed in 5.15.0-1094.103+fips1
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Fixed in 5.15.0-144.157+fips1
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Fixed in 5.15.0-1087.96+fips1
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Fixed in 6.8.0-87.88
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Fixed in 6.8.0-1042.44
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Fixed in 6.8.0-1044.50
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Fixed in 6.8.0-1046.53
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Fixed in 6.8.0-1029.32
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Fixed in 6.8.0-1043.46
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Fixed in 6.8.0-1039.44
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Fixed in 6.8.0-1026.29
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Fixed in 6.8.0-1040.40
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Fixed in 6.8.0-87.88.1
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Fixed in 6.8.0-1042.45
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Fixed in 6.8.0-1042.45.1
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Fixed in 6.8.0-1012.12
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Fixed in 6.8.0-1039.40
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Fixed in 6.8.0-1042.46
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Fixed in 6.8.0-1019.20
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Fixed in 6.8.0-1013.17
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Fixed in 6.8.0-2033.34
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Fixed in 6.8.1-1037.38
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Fixed in 6.8.0-1042.44+fips1
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Fixed in 6.8.0-1044.50+fips1
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Fixed in 6.8.0-87.88+fips1
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Fixed in 6.8.0-1043.46+fips1
Compensating control
In ssi_protocol_remove(), cancel the bound ssip_xmit_work work before proceeding with cleanup or freeing the ssi structure.

Event History

Apr 18, 2025

CVE Published

via OSV·03:15 PM

Data Sourced

via OSV·03:15 PM

DescriptionSeverityAffected Software

Frequently Asked Questions

Who is exposed to this issue?

Systems using the affected Ubuntu Linux kernel packages are exposed when the HSI ssi_protocol driver is present and its module can be removed while its transmit work is running. The listed packages include linux, linux-aws-fips, linux-azure-fips, linux-fips, linux-gcp-fips, linux-azure, linux-gcp, and linux-oracle.

What does an attacker need to exploit the vulnerability?

The severity vector indicates local access, low attack complexity, low privileges, and no user interaction. Exploitation requires triggering the race between queued ssi_protocol transmit work and removal of the ssi_protocol module.

What is the impact if the race is triggered?

The race causes a use-after-free condition: the driver state can be freed during module removal and then accessed by transmit work. The provided severity vector rates confidentiality, integrity, and availability impact as high.

What can be done if an updated kernel cannot be deployed immediately?

Avoid removing the ssi_protocol module while its transmit work may be active. The upstream fix cancels the work before cleanup in ssi_protocol_remove(), preventing the freed driver state from being used.

UBUNTU-CVE-2025-37838: Use After Free

Affected Software

Remediation

Event History

Frequently Asked Questions

Who is exposed to this issue?

What does an attacker need to exploit the vulnerability?

What is the impact if the race is triggered?

What can be done if an updated kernel cannot be deployed immediately?

Company

Resources

Contact

Frequently Asked Questions

Who is exposed to this issue?

What does an attacker need to exploit the vulnerability?

What is the impact if the race is triggered?

What can be done if an updated kernel cannot be deployed immediately?