xfs: fix exchmaps reservation limit check

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-64357
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-25 10:17:18 UTC
Updated2026-07-25 10:17:18 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: xfs: fix exchmaps reservation limit check xfs_exchmaps_estimate_overhead() adds the bmbt and rmapbt overhead to a local resblks variable, but the final UINT_MAX check still tests req->resblks. That is the reservation value from before the overhead was added. The computed value is stored back in req->resblks and later passed to xfs_trans_alloc(), whose block reservation argument is unsigned int. Check the computed reservation so the existing limit applies to the value that will be used.

Risk And Classification

EPSS: 0.001680000 probability, percentile 0.064570000 (date 2026-07-28)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 966ceafc7a437105ecfe1cadb3747b2965a260ca c597c8580d50127fc1221b5a5b653a94d49e23e3 git Not specified
CNA Linux Linux affected 966ceafc7a437105ecfe1cadb3747b2965a260ca a62ef2d13d6e7270dd5e88c6082bf2d0edcd5112 git Not specified
CNA Linux Linux affected 966ceafc7a437105ecfe1cadb3747b2965a260ca 4707344b0d36d1012c8a1716e20167cd3afdd5f1 git Not specified
CNA Linux Linux affected 966ceafc7a437105ecfe1cadb3747b2965a260ca 0a5213bbff62b51c7d4999ac8c7e11ea57d00d45 git Not specified
CNA Linux Linux affected 6.10 Not specified
CNA Linux Linux unaffected 6.10 semver Not specified
CNA Linux Linux unaffected 6.12.96 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.39 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.4 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/0a5213bbff62b51c7d4999ac8c7e11ea57d00d45 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a62ef2d13d6e7270dd5e88c6082bf2d0edcd5112 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4707344b0d36d1012c8a1716e20167cd3afdd5f1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c597c8580d50127fc1221b5a5b653a94d49e23e3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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