Riskcovery

CVE-2026-45884

apparmor: avoid per-cpu hold underflow in aa_get_buffer

State
Published
Severity
Not scored
Published
May 27, 2026
Updated
May 27, 2026
Reserved
May 13, 2026

Read the record on cve.org

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • ea9bae12d02819556db63348db8bd8441eb316f2 to before 202824a1f89a9786c20a3d646a7c88d223abb1b2Affected
  • ea9bae12d02819556db63348db8bd8441eb316f2 to before 80c334acc6d0bee8605a358a33e69b4aea1ffb92Affected
  • ea9bae12d02819556db63348db8bd8441eb316f2 to before 4bcddd0f6b2e52b4c7b520e4d36a115caf5b7169Affected
  • ea9bae12d02819556db63348db8bd8441eb316f2 to before 640cf2f09575c9dc344b3f7be2498d31e3923eadAffected
LinuxLinux
  • 6.7Affected
  • before 6.7Not affected
  • 6.12.75 through 6.12.*Not affected
  • 6.18.14 through 6.18.*Not affected
  • 6.19.4 through 6.19.*Not affected
  • 7.0 and laterNot affected

References

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