UBUNTU-CVE-2021-47142: Use After Free

Q: Which systems are exposed to this issue?

The affected software list includes Ubuntu Linux kernel packages for the standard, FIPS, AWS, Azure, and GCP variants. The fault occurs in the AMDGPU/AMDKFD graphics-driver path, so exposure depends on use of that driver and GPU memory allocation functionality.

Q: What level of access does an attacker need?

The supplied severity vector indicates local attack access with low privileges and no user interaction. The trace shows the issue is reached through the AMDKFD GPU memory allocation ioctl.

Q: What is the likely impact of successful exploitation?

The vulnerability is a use-after-free that can trigger a kernel general protection fault and panic. The provided severity vector rates confidentiality, integrity, and availability impact as high.

Q: How can administrators identify a possible occurrence?

Kernel logs may show a general protection fault with calls through sg_free_table, amdgpu_ttm_backend_unbind, amdgpu_ttm_backend_destroy, and kfd_ioctl_alloc_memory_of_gpu. A non-canonical address such as the one shown in the supplied panic trace may also be present.

Published Mar 25, 2024

Updated

In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: Fix a use-after-free looks like we forget to set ttm->sg to NULL. Hit panic below [ 1235.844104] general protection fault, probably for non-canonical address 0x6b6b6b6b6b6b7b4b: 0000 [#1] SMP DEBUGPAGEALLOC NOPTI [ 1235.989074] Call Trace: [ 1235.991751] sgfreetable+0x17/0x20 [ 1235.995667] amdgputtmbackendunbind.cold+0x4d/0xf7 [amdgpu] [ 1236.002288] amdgputtmbackenddestroy+0x29/0x130 [amdgpu] [ 1236.008464] ttmttdestroy+0x1e/0x30 [ttm] [ 1236.013066] ttmbocleanupmemtypeuse+0x51/0xa0 [ttm] [ 1236.018783] ttmborelease+0x262/0xa50 [ttm] [ 1236.023547] ttmboput+0x82/0xd0 [ttm] [ 1236.027766] amdgpubounref+0x26/0x50 [amdgpu] [ 1236.032809] amdgpuamdkfdgpuvmallocmemoryofgpu+0x7aa/0xd90 [amdgpu] [ 1236.040400] kfdioctlallocmemoryofgpu+0xe2/0x330 [amdgpu] [ 1236.046912] kfdioctl+0x463/0x690 [amdgpu]

Affected Software

117 affected componentsFixes available

ubuntu/linux-azure<4.15.0-1121.134~14.04.1

4.15.0-1121.134~14.04.1

ubuntu/linux-aws<4.4.0-1153.159

4.4.0-1153.159

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<4.15.0-1109.116~16.04.1

4.15.0-1109.116~16.04.1

ubuntu/linux-azure<4.15.0-1121.134~16.04.1

4.15.0-1121.134~16.04.1

ubuntu/linux-gcp<4.15.0-1106.120~16.04.1

4.15.0-1106.120~16.04.1

ubuntu/linux-hwe<4.15.0-151.157~16.04.1

4.15.0-151.157~16.04.1

ubuntu/linux-kvm<4.4.0-1154.165

4.4.0-1154.165

ubuntu/linux-oracle<4.15.0-1078.86~16.04.1

4.15.0-1078.86~16.04.1

ubuntu/linux-hwe-edge*

ubuntu/linux-fips<4.4.0-1123.130

4.4.0-1123.130

ubuntu/linux-fips*

ubuntu/linux<4.15.0-151.157

4.15.0-151.157

ubuntu/linux-aws<4.15.0-1109.116

4.15.0-1109.116

ubuntu/linux-aws-5.4<5.4.0-1054.57~18.04.1

5.4.0-1054.57~18.04.1

ubuntu/linux-azure-4.15<4.15.0-1121.134

4.15.0-1121.134

ubuntu/linux-azure-5.4<5.4.0-1055.57~18.04.1

5.4.0-1055.57~18.04.1

ubuntu/linux-gcp-4.15<4.15.0-1106.120

4.15.0-1106.120

ubuntu/linux-gcp-5.4<5.4.0-1049.53~18.04.1

5.4.0-1049.53~18.04.1

ubuntu/linux-hwe-5.4<5.4.0-80.90~18.04.1

5.4.0-80.90~18.04.1

ubuntu/linux-kvm<4.15.0-1097.99

4.15.0-1097.99

ubuntu/linux-oracle<4.15.0-1078.86

4.15.0-1078.86

ubuntu/linux-oracle-5.4<5.4.0-1052.56~18.04.1

5.4.0-1052.56~18.04.1

ubuntu/linux-raspi-5.4<5.4.0-1041.45~18.04.1

5.4.0-1041.45~18.04.1

ubuntu/linux-aws-5.0*

ubuntu/linux-aws-5.3*

ubuntu/linux-azure*

ubuntu/linux-azure-5.3*

ubuntu/linux-azure-edge*

ubuntu/linux-gcp*

ubuntu/linux-gcp-5.3*

ubuntu/linux-gke-4.15*

ubuntu/linux-gke-5.4*

ubuntu/linux-gkeop-5.4*

ubuntu/linux-hwe*

ubuntu/linux-hwe-edge*

ubuntu/linux-oem*

ubuntu/linux-oracle-5.0*

ubuntu/linux-oracle-5.3*

ubuntu/linux-aws-fips<4.15.0-2051.53

4.15.0-2051.53

ubuntu/linux-azure-fips<4.15.0-2033.37

4.15.0-2033.37

ubuntu/linux-fips<4.15.0-1066.75

4.15.0-1066.75

ubuntu/linux-gcp-fips<4.15.0-2016.18

4.15.0-2016.18

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux<5.4.0-80.90

5.4.0-80.90

ubuntu/linux-aws<5.4.0-1054.57

5.4.0-1054.57

ubuntu/linux-azure<5.4.0-1055.57

5.4.0-1055.57

ubuntu/linux-bluefield<5.4.0-1016.19

5.4.0-1016.19

ubuntu/linux-gcp<5.4.0-1049.53

5.4.0-1049.53

ubuntu/linux-gkeop<5.4.0-1021.22

5.4.0-1021.22

ubuntu/linux-kvm<5.4.0-1044.46

5.4.0-1044.46

ubuntu/linux-oracle<5.4.0-1052.56

5.4.0-1052.56

ubuntu/linux-raspi<5.4.0-1041.45

5.4.0-1041.45

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-hwe-5.11*

ubuntu/linux-hwe-5.13*

ubuntu/linux-hwe-5.8*

ubuntu/linux-intel-5.13*

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<5.4.0-1069.73+fips2

5.4.0-1069.73+fips2

ubuntu/linux-azure-fips<5.4.0-1073.76+fips1

5.4.0-1073.76+fips1

ubuntu/linux-fips<5.4.0-1031.36

5.4.0-1031.36

ubuntu/linux-gcp-fips<5.4.0-1067.71~20.04.1

5.4.0-1067.71~20.04.1

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux-allwinner-5.19*

ubuntu/linux-aws-5.19*

ubuntu/linux-aws-6.2*

ubuntu/linux-azure-5.19*

ubuntu/linux-azure-6.2*

ubuntu/linux-azure-fde-5.19*

ubuntu/linux-azure-fde-6.2*

ubuntu/linux-gcp-5.19*

ubuntu/linux-gcp-6.2*

ubuntu/linux-hwe-5.19*

ubuntu/linux-hwe-6.2*

ubuntu/linux-intel-iot-realtime*

ubuntu/linux-lowlatency-hwe-5.19*

ubuntu/linux-lowlatency-hwe-6.2*

ubuntu/linux-nvidia-6.2*

ubuntu/linux-oem-5.17*

ubuntu/linux-oem-6.0*

ubuntu/linux-oem-6.1*

ubuntu/linux-realtime*

ubuntu/linux-riscv*

ubuntu/linux-riscv-5.19*

ubuntu/linux-starfive-5.19*

ubuntu/linux-starfive-6.2*

ubuntu/linux-raspi-realtime*

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 4.15.0-1121.134~14.04.1
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 4.4.0-1153.159
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 4.15.0-1109.116~16.04.1
Upgrade
Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 4.15.0-1121.134~16.04.1
Upgrade
Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.
Fixed in 4.15.0-1106.120~16.04.1
Upgrade
Upgrade ubuntu/linux-hwe to a version that resolves this vulnerability.
Fixed in 4.15.0-151.157~16.04.1
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 4.15.0-1078.86~16.04.1
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 4.15.0-151.157
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 4.15.0-1109.116
Upgrade
Upgrade ubuntu/linux-aws-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1054.57~18.04.1
Upgrade
Upgrade ubuntu/linux-azure-4.15 to a version that resolves this vulnerability.
Fixed in 4.15.0-1121.134
Upgrade
Upgrade ubuntu/linux-azure-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1055.57~18.04.1
Upgrade
Upgrade ubuntu/linux-gcp-4.15 to a version that resolves this vulnerability.
Fixed in 4.15.0-1106.120
Upgrade
Upgrade ubuntu/linux-gcp-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1049.53~18.04.1
Upgrade
Upgrade ubuntu/linux-hwe-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-80.90~18.04.1
Upgrade
Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.
Fixed in 4.15.0-1097.99
Upgrade
Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 4.15.0-1078.86
Upgrade
Upgrade ubuntu/linux-oracle-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1052.56~18.04.1
Upgrade
Upgrade ubuntu/linux-raspi-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1041.45~18.04.1
Upgrade
Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.
Fixed in 4.15.0-2051.53
Upgrade
Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.
Fixed in 4.15.0-2033.37
Upgrade
Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.
Fixed in 4.15.0-1066.75
Upgrade
Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.
Fixed in 4.15.0-2016.18
Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 5.4.0-80.90
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 5.4.0-1054.57
Upgrade
Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 5.4.0-1055.57
Upgrade
Upgrade ubuntu/linux-bluefield to a version that resolves this vulnerability.
Fixed in 5.4.0-1016.19
Upgrade
Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.
Fixed in 5.4.0-1049.53
Upgrade
Upgrade ubuntu/linux-gkeop to a version that resolves this vulnerability.
Fixed in 5.4.0-1021.22
Upgrade
Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.
Fixed in 5.4.0-1044.46
Upgrade
Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 5.4.0-1052.56
Upgrade
Upgrade ubuntu/linux-raspi to a version that resolves this vulnerability.
Fixed in 5.4.0-1041.45
Upgrade
Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.
Fixed in 5.4.0-1069.73+fips2
Upgrade
Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.
Fixed in 5.4.0-1073.76+fips1
Upgrade
Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.
Fixed in 5.4.0-1031.36
Upgrade
Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.
Fixed in 5.4.0-1067.71~20.04.1

Event History

Mar 25, 2024

CVE Published

via OSV·09:15 AM

Data Sourced

via OSV·09:15 AM

DescriptionSeverityAffected Software

Frequently Asked Questions

Which systems are exposed to this issue?

The affected software list includes Ubuntu Linux kernel packages for the standard, FIPS, AWS, Azure, and GCP variants. The fault occurs in the AMDGPU/AMDKFD graphics-driver path, so exposure depends on use of that driver and GPU memory allocation functionality.

What level of access does an attacker need?

The supplied severity vector indicates local attack access with low privileges and no user interaction. The trace shows the issue is reached through the AMDKFD GPU memory allocation ioctl.

What is the likely impact of successful exploitation?

The vulnerability is a use-after-free that can trigger a kernel general protection fault and panic. The provided severity vector rates confidentiality, integrity, and availability impact as high.

How can administrators identify a possible occurrence?

Kernel logs may show a general protection fault with calls through sg_free_table, amdgpu_ttm_backend_unbind, amdgpu_ttm_backend_destroy, and kfd_ioctl_alloc_memory_of_gpu. A non-canonical address such as the one shown in the supplied panic trace may also be present.

UBUNTU-CVE-2021-47142: Use After Free

Affected Software

Remediation

Event History

Frequently Asked Questions

Which systems are exposed to this issue?

What level of access does an attacker need?

What is the likely impact of successful exploitation?

How can administrators identify a possible occurrence?

Company

Resources

Contact

Frequently Asked Questions

Which systems are exposed to this issue?

What level of access does an attacker need?

What is the likely impact of successful exploitation?

How can administrators identify a possible occurrence?