CVE-2026-97547xfs: fix exchange-range reflink flag clearing issue with INO1_WRITTEN
- —Not scoredno CVSS score yet
- 0.20%Exploitation in 30 daysEPSS · top 90% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In 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.
Timeline
ID reserved
By Linux
- 1 day later
· 1 day later
Published
- 24 days later
· 24 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.
- EPSS (exploitation in 30 days)
- 0.20% · top 90% of all CVEs (12 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected 966ceafc7a437105ecfe1cadb3747b2965a260ca – < 56f87ac2b9543be2be529b831666682e6df4bc40
- affected 966ceafc7a437105ecfe1cadb3747b2965a260ca – < fac32b9950a2aab3f8659d23b2947b8fb305c3fe
- affected 966ceafc7a437105ecfe1cadb3747b2965a260ca – < 8ae30b9a8c207f9bd03a98eda7b5d641daa79bdb
- affected 966ceafc7a437105ecfe1cadb3747b2965a260ca – < a23eca88448e52eb1a81549862df7adce794fafb
- affected 6.10
- unaffected < 6.10
- unaffected 6.12.111 – ≤ 6.12.*
- unaffected 6.18.53 – ≤ 6.18.*
- unaffected 7.2.7 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References4
- https://git.kernel.org/stable/c/56f87ac2b9543be2be529b831666682e6df4bc40 (opens in a new tab)
- https://git.kernel.org/stable/c/fac32b9950a2aab3f8659d23b2947b8fb305c3fe (opens in a new tab)
- https://git.kernel.org/stable/c/8ae30b9a8c207f9bd03a98eda7b5d641daa79bdb (opens in a new tab)
- https://git.kernel.org/stable/c/a23eca88448e52eb1a81549862df7adce794fafb (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-86855 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-97547)Record last updated .