Description
In the Linux kernel, the following vulnerability has been resolved:
apparmor: avoid per-cpu hold underflow in aa_get_buffer
When aa_get_buffer() pulls from the per-cpu list it unconditionally decrements cache->hold. If hold reaches 0 while count is still non-zero, the unsigned decrement wraps to UINT_MAX. This keeps hold non-zero for a very long time, so aa_put_buffer() never returns buffers to the global list, which can starve other CPUs and force repeated kmalloc(aa_g_path_max) allocations.
Guard the decrement so hold never underflows.
Metrics
CVSS 3.1 5.5/10
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= ea9bae12d02819556db63348db8bd8441eb316f2, < 202824a1f89a9786c20a3d646a7c88d223abb1b2; >= ea9bae12d02819556db63348db8bd8441eb316f2, < 80c334acc6d0bee8605a358a33e69b4aea1ffb92; >= ea9bae12d02819556db63348db8bd8441eb316f2, < 4bcddd0f6b2e52b4c7b520e4d36a115caf5b7169; >= ea9bae12d02819556db63348db8bd8441eb316f2, < 640cf2f09575c9dc344b3f7be2498d31e3923ead |
| Linux | Linux | 6.7 |
References
- https://git.kernel.org/stable/c/202824a1f89a9786c20a3d646a7c88d223abb1b2Patch
- https://git.kernel.org/stable/c/4bcddd0f6b2e52b4c7b520e4d36a115caf5b7169Patch
- https://git.kernel.org/stable/c/640cf2f09575c9dc344b3f7be2498d31e3923eadPatch
- https://git.kernel.org/stable/c/80c334acc6d0bee8605a358a33e69b4aea1ffb92Patch
Timeline
- Published
- May 27, 2026
- Last modified
- Jun 25, 2026
- NVD status
- Analyzed