CVE-2026-45884 (GCVE-0-2026-45884)

Vulnerability from cvelistv5 – Published: 2026-05-27 12:16 – Updated: 2026-05-27 12:16
VLAI
Title
apparmor: avoid per-cpu hold underflow in aa_get_buffer
Summary
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: ea9bae12d02819556db63348db8bd8441eb316f2 , < 202824a1f89a9786c20a3d646a7c88d223abb1b2 (git)
Affected: ea9bae12d02819556db63348db8bd8441eb316f2 , < 80c334acc6d0bee8605a358a33e69b4aea1ffb92 (git)
Affected: ea9bae12d02819556db63348db8bd8441eb316f2 , < 4bcddd0f6b2e52b4c7b520e4d36a115caf5b7169 (git)
Affected: ea9bae12d02819556db63348db8bd8441eb316f2 , < 640cf2f09575c9dc344b3f7be2498d31e3923ead (git)
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Linux Linux Affected: 6.7
Unaffected: 0 , < 6.7 (semver)
Unaffected: 6.12.75 , ≤ 6.12.* (semver)
Unaffected: 6.18.14 , ≤ 6.18.* (semver)
Unaffected: 6.19.4 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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