PT-2026-43751 · Linux · Linux

Published 2026-05-27 · Updated 2026-05-27 · CVE-2026-45884

NVD

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.

Related Identifiers

CVE-2026-45884

Affected Products

Linux

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2026-45884 · Security Note
• https://git.kernel.org/stable/c/202824a1f89a9786c20a3d646a7c88d223abb1b2 · Note
• https://git.kernel.org/stable/c/80c334acc6d0bee8605a358a33e69b4aea1ffb92 · Note
• https://git.kernel.org/stable/c/4bcddd0f6b2e52b4c7b520e4d36a115caf5b7169 · Note
• https://git.kernel.org/stable/c/640cf2f09575c9dc344b3f7be2498d31e3923ead · Note