Description (CNA)
In 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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5 before dc11be133efca5fe3a2fb02b016dee825cc12f18; affected 3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5 before b8c9aa832b52680ee40d6cab0efb081f9a69df05; affected 3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5 before 50f0012da1040f69a4e788cd9aed587c9a04983f; affected 3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5 before e705d81a7193dd19e69b8e2bad4696d78a4ea075; affected 3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5 before 206c09b04dc5469c7ff14d8aceff2d47c88078d9; affected 3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5 before 44f891bc088958399eec27f7604928694aa35581; affected 3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5 before 2f4acd0fcd862e22eab45690ec2c08c80b6ef2e7 |
| Linux / Linux | affected 4.11; unaffected 0 before 4.11; unaffected 5.15.212 through 5.15.*; unaffected 6.1.178 through 6.1.*; unaffected 6.6.145 through 6.6.*; unaffected 6.12.96 through 6.12.*; unaffected 6.18.39 through 6.18.*; unaffected 7.1.4 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/dc11be133efca5fe3a2fb02b016dee825cc12f18
- https://git.kernel.org/stable/c/b8c9aa832b52680ee40d6cab0efb081f9a69df05
- https://git.kernel.org/stable/c/50f0012da1040f69a4e788cd9aed587c9a04983f
- https://git.kernel.org/stable/c/e705d81a7193dd19e69b8e2bad4696d78a4ea075
- https://git.kernel.org/stable/c/206c09b04dc5469c7ff14d8aceff2d47c88078d9
- https://git.kernel.org/stable/c/44f891bc088958399eec27f7604928694aa35581
- https://git.kernel.org/stable/c/2f4acd0fcd862e22eab45690ec2c08c80b6ef2e7
- https://cdn2.qualys.com/advisory/2026/07/22/RefluXFS.txt
ADP enrichment
No English description supplied.
- http://www.openwall.com/lists/oss-security/2026/07/22/14
- http://www.openwall.com/lists/oss-security/2026/07/22/18
- http://www.openwall.com/lists/oss-security/2026/07/22/19
- http://www.openwall.com/lists/oss-security/2026/07/31/3
- http://www.openwall.com/lists/oss-security/2026/08/03/4
- http://www.openwall.com/lists/oss-security/2026/08/03/8
No English description supplied.
No references supplied.