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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.

PUBLISHED Reserved 2026-05-13 | Published 2026-05-27 | Updated 2026-05-27 | Assigner Linux

Product status

Default status
unaffected

ea2e6467ac36bf3d785defc89e58269b15d182f7 (git) before 7752d36343862323bbeea4ce3adf0ec2ed86e122
affected

ea2e6467ac36bf3d785defc89e58269b15d182f7 (git) before f415e114b58fe02c41191e47f24bdabb438daf72
affected

ea2e6467ac36bf3d785defc89e58269b15d182f7 (git) before a2c86aa621c22f2a7e26c654f936d65cfff0aa91
affected

Default status
affected

6.18
affected

Any version before 6.18
unaffected

6.18.14 (semver)
unaffected

6.19.4 (semver)
unaffected

7.0 (original_commit_for_fix)
unaffected

References

git.kernel.org/...c/7752d36343862323bbeea4ce3adf0ec2ed86e122

git.kernel.org/...c/f415e114b58fe02c41191e47f24bdabb438daf72

git.kernel.org/...c/a2c86aa621c22f2a7e26c654f936d65cfff0aa91

cve.org (CVE-2026-45927)

nvd.nist.gov (CVE-2026-45927)

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