Description
An issue was discovered in the Linux kernel before 5.14.8. A use-after-free in selinux_ptrace_traceme (aka the SELinux handler for PTRACE_TRACEME) could be used by local attackers to cause memory corruption and escalate privileges, aka CID-a3727a8bac0a. This occurs because of an attempt to access the subjective credentials of another task.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | linux | 5.14.9-1 | — |
| Debian 13 | linux | 5.14.9-1 | — |
| Debian 12 | linux | 5.14.9-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | linux-hwe-5.13 | 5.13.0-22.22~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-oem-5.13 | 5.13.0-1020.24 | USN-5162-1 |
| Ubuntu 20.04 LTS | linux-oem-5.14 | 5.14.0-1005.5 | — |
| Ubuntu 20.04 LTS | linux-riscv +8 | No fix yet | — |
| Ubuntu 18.04 LTS | linux-gcp +12 | No fix yet | — |
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 2 (CBL-Mariner) | kernel | 5.15.2.1-1 | — |
Advisories 1
- USN-5162-1 linux, linux-aws, linux-azure, linux-gcp, linux-kvm, linux-oem-5.13, linux-oracle, linux-raspi vulnerabilities Ubuntu Security Notices (USN) · Sep 14, 2026
References
- https://bugs.chromium.org/p/project-zero/issues/detail?id=2229
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a3727a8bac0a9e77c70820655fd8715523ba3db7
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14.8
- https://security.netapp.com/advisory/ntap-20211125-0001/