What’s Vulnerable › Vulnerabilities

CVE-2022-50855: bpf: prevent leak of lsm program after failed attach

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-30 · updated 2026-06-17

Description

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/20220628174314.1216643-4-sdf@google.com/

Affected products

• Linux kernel: 6.0 — fixed in 6.2

How to fix

Upgrade to a fixed version: Linux kernel 6.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/6a1504dd36cd9a0a69250d61da8bdb17b29f1fe8
• https://git.kernel.org/stable/c/82b39df5ddb298daaf6dc504032ff7eb027fa106
• https://git.kernel.org/stable/c/e89f3edffb860a0f54a9ed16deadb7a4a1fa3862

Get alerted when CVE-2022-50855 or the next vulnerability affects your stack