xfs: resample the data fork mapping after cycling ILOCK

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-64600
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-23 06:16:50 UTC
Updated2026-07-23 06:16:50 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: xfs: resample the data fork mapping after cycling ILOCK xfs_reflink_fill_{cow_hole,delalloc} are both presented with an inode, a data fork mapping, and a cow fork mapping. Unfortunately, these two helpers cycle the ILOCK to grab a transaction, which means that the mappings are stale as soon as we reacquire the ILOCK. Currently we refresh the cow fork mapping by re-calling xfs_find_trim_cow_extent, but we don't refresh the data fork mapping beforehand, which means that the xfs_bmap_trim_cow in that function queries the refcount btree about the wrong physical blocks and returns an inaccurate value in *shared. If *shared is now false, the directio write proceeds with a stale data fork mapping. Fix this by querying the data fork mapping if the sequence counter changes across the ILOCK cycle.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5 e705d81a7193dd19e69b8e2bad4696d78a4ea075 git Not specified
CNA Linux Linux affected 3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5 206c09b04dc5469c7ff14d8aceff2d47c88078d9 git Not specified
CNA Linux Linux affected 3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5 44f891bc088958399eec27f7604928694aa35581 git Not specified
CNA Linux Linux affected 3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5 2f4acd0fcd862e22eab45690ec2c08c80b6ef2e7 git Not specified
CNA Linux Linux affected 4.11 Not specified
CNA Linux Linux unaffected 4.11 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-rc4 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/2f4acd0fcd862e22eab45690ec2c08c80b6ef2e7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/44f891bc088958399eec27f7604928694aa35581 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e705d81a7193dd19e69b8e2bad4696d78a4ea075 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/206c09b04dc5469c7ff14d8aceff2d47c88078d9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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