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CVE-2026-45884

5.5 · MEDIUM

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 dec…

Published May 27, 2026CWE-191EPSS 0.16%

Overview

CVE-2026-45884 is a medium-severity vulnerability. It was published on May 27, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/202824a1f89a9786c20a3d646a7c88d223abb1b2Refgit.kernel.org/stable/c/4bcddd0f6b2e52b4c7b520e4d36a115caf5b7169Refgit.kernel.org/stable/c/640cf2f09575c9dc344b3f7be2498d31e3923eadRefgit.kernel.org/stable/c/80c334acc6d0bee8605a358a33e69b4aea1ffb92

How CyberStrike helps

Frequently asked questions

What is CVE-2026-45884?

CVE-2026-45884 is a medium-severity vulnerability. It was published on May 27, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-45884?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-45884?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-45884?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-45884 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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