apparmor: avoid per-cpu hold underflow in aa_get_buffer

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Summary

CVECVE-2026-45884
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-27 14:17:02 UTC
Updated2026-06-25 21:12:55 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.000180000 probability, percentile 0.048460000 (date 2026-06-01)

Problem Types: CWE-191

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected ea9bae12d02819556db63348db8bd8441eb316f2 202824a1f89a9786c20a3d646a7c88d223abb1b2 git Not specified
CNA Linux Linux affected ea9bae12d02819556db63348db8bd8441eb316f2 80c334acc6d0bee8605a358a33e69b4aea1ffb92 git Not specified
CNA Linux Linux affected ea9bae12d02819556db63348db8bd8441eb316f2 4bcddd0f6b2e52b4c7b520e4d36a115caf5b7169 git Not specified
CNA Linux Linux affected ea9bae12d02819556db63348db8bd8441eb316f2 640cf2f09575c9dc344b3f7be2498d31e3923ead git Not specified
CNA Linux Linux affected 6.7 Not specified
CNA Linux Linux unaffected 6.7 semver Not specified
CNA Linux Linux unaffected 6.12.75 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.14 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.4 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/640cf2f09575c9dc344b3f7be2498d31e3923ead 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/80c334acc6d0bee8605a358a33e69b4aea1ffb92 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/202824a1f89a9786c20a3d646a7c88d223abb1b2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/4bcddd0f6b2e52b4c7b520e4d36a115caf5b7169 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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