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CVE-2026-45927

4.7 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: bpf: Require frozen map for calculating map hash Currently, bpf_map_get_info_by_fd calculates and caches the hash of the map re…

Published May 27, 2026CWE-367EPSS 0.11%

Overview

CVE-2026-45927 is a medium-severity vulnerability. It was published on May 27, 2026 and has a CVSS 3.1 base score of 4.7 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 4.7, 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:

bpf: Require frozen map for calculating map hash

Currently, bpf_map_get_info_by_fd calculates and caches the hash of the

map regardless of the map's frozen state.

This leads to a TOCTOU bug where userspace can call

BPF_OBJ_GET_INFO_BY_FD to cache the hash and then modify the map

contents before freezing.

Therefore, a trusted loader can be tricked into verifying the stale hash

while loading the modified contents.

Fix this by returning -EPERM if the map is not frozen when the hash is

requested. This ensures the hash is only generated for the final,

immutable state of the map.

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/7752d36343862323bbeea4ce3adf0ec2ed86e122Refgit.kernel.org/stable/c/a2c86aa621c22f2a7e26c654f936d65cfff0aa91Refgit.kernel.org/stable/c/f415e114b58fe02c41191e47f24bdabb438daf72

How CyberStrike helps

Frequently asked questions

What is CVE-2026-45927?

CVE-2026-45927 is a medium-severity vulnerability. It was published on May 27, 2026 and has a CVSS 3.1 base score of 4.7 (MEDIUM).

How severe is CVE-2026-45927?

This vulnerability has a CVSS 3.1 base score of 4.7, 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-2026-45927?

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-2026-45927?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-45927 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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