bpf: Require frozen map for calculating map hash

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Summary

CVECVE-2026-45927
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-27 14:17:08 UTC
Updated2026-05-27 14:48:03 UTC
DescriptionIn 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.

Risk And Classification

EPSS: 0.000170000 probability, percentile 0.042650000 (date 2026-06-01)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected ea2e6467ac36bf3d785defc89e58269b15d182f7 7752d36343862323bbeea4ce3adf0ec2ed86e122 git Not specified
CNA Linux Linux affected ea2e6467ac36bf3d785defc89e58269b15d182f7 f415e114b58fe02c41191e47f24bdabb438daf72 git Not specified
CNA Linux Linux affected ea2e6467ac36bf3d785defc89e58269b15d182f7 a2c86aa621c22f2a7e26c654f936d65cfff0aa91 git Not specified
CNA Linux Linux affected 6.18 Not specified
CNA Linux Linux unaffected 6.18 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/7752d36343862323bbeea4ce3adf0ec2ed86e122 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f415e114b58fe02c41191e47f24bdabb438daf72 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a2c86aa621c22f2a7e26c654f936d65cfff0aa91 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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