xfs: fix exchange-range reflink flag clearing issue with INO1_WRITTEN

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-97547
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-25 11:17:05 UTC
Updated2026-09-25 11:17:05 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: xfs: fix exchange-range reflink flag clearing issue with INO1_WRITTEN When exchanging two full-file ranges, xmi_can_exchange_reflink_flags() can move the reflink inode flag from the file that currently has it to the other file, as long as exactly one side is marked. This assumes that the file contents, and therefore all shared extents, are exchanged. That assumption is not true when XFS_EXCHMAPS_INO1_WRITTEN is set. xfs_exchmaps_can_skip_mapping() can skip hole and unwritten mappings from file1, so an exchange can complete without moving every mapping that the earlier flag-swap decision accounted for. In that case the post-operation cleanup can clear the reflink flag from an inode that still owns shared written extents. Later writes then take the non-reflink write path and may update blocks that should still have been protected by CoW, which shows up as data corruption between reflink-related files. Fix this by disabling the reflink flag exchange whenever XFS_EXCHMAPS_INO1_WRITTEN is requested. The contents exchange can still proceed; the conservative outcome is that both inodes keep the reflink flag. The regular reflink flag cleanup path can drop the extra flag later once the inode no longer has shared extents.

Risk And Classification

EPSS: 0.002000000 probability, percentile 0.088100000 (date 2026-09-27)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 966ceafc7a437105ecfe1cadb3747b2965a260ca 56f87ac2b9543be2be529b831666682e6df4bc40 git Not specified
CNA Linux Linux affected 966ceafc7a437105ecfe1cadb3747b2965a260ca fac32b9950a2aab3f8659d23b2947b8fb305c3fe git Not specified
CNA Linux Linux affected 966ceafc7a437105ecfe1cadb3747b2965a260ca 8ae30b9a8c207f9bd03a98eda7b5d641daa79bdb git Not specified
CNA Linux Linux affected 966ceafc7a437105ecfe1cadb3747b2965a260ca a23eca88448e52eb1a81549862df7adce794fafb git Not specified
CNA Linux Linux affected 6.10 Not specified
CNA Linux Linux unaffected 6.10 semver Not specified
CNA Linux Linux unaffected 6.12.111 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.53 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.7 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/56f87ac2b9543be2be529b831666682e6df4bc40 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a23eca88448e52eb1a81549862df7adce794fafb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/fac32b9950a2aab3f8659d23b2947b8fb305c3fe 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8ae30b9a8c207f9bd03a98eda7b5d641daa79bdb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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