CVE-2022-50855
In the Linux kernel, the following vulnerability has been resolved: bpf: prevent leak of lsm program after failed attach In [0], we added the ability to bpf_prog_attach LSM programs to cgroups, but in our validation to make sure the prog is meant to be attached to BPF_LSM_CGROUP, we return too early if the check fails. This results in lack of decrementing prog's refcnt (through bpf_prog_put) leaving the LSM program alive past the point of the expected lifecycle. This fix allows for the decrement to take place. [0] https://lore.kernel.org/all/[email protected]/
Affected versions
Linux kernel versions
6.0
and later are affected. Fixed in
6.0.16,
6.1.2,
6.2
and their respective stable series.
References
The following references provide additional information about CVE-2022-50855 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.
-
PatchKernel patch commithttps://git.kernel.org/stable/c/6a1504dd36cd9a0a69250d61da8bdb17b29f1fe8
-
PatchKernel patch commithttps://git.kernel.org/stable/c/82b39df5ddb298daaf6dc504032ff7eb027fa106
-
PatchKernel patch commithttps://git.kernel.org/stable/c/e89f3edffb860a0f54a9ed16deadb7a4a1fa3862
Frequently asked questions
-
What is CVE-2022-50855?
CVE-2022-50855 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 6.0 onward and has been patched in 6.0.16, 6.1.2 and 6.2. CVE-2022-50855 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
-
Is there a patch available for CVE-2022-50855?
Yes — CVE-2022-50855 has been patched. Fixed versions include 6.0.16, 6.1.2 and 6.2. If you are running Linux kernel 6.0 or later up to the fix versions, apply the relevant patch for your kernel branch.
-
Is CVE-2022-50855 actively exploited?
No — CVE-2022-50855 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.