CVE-2026-64600
CVE CVE-2026-64600EUVD EUVD-2026-47879Published 2026-07-23T05:46:56.000ZLast changed 2026-08-05T12:43:07.000ZCVSS 7.8
What the advisory describes
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.
Source: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Linux — Linux patch: 7.1.4; 3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5 <50f0012da1040f69a4e788cd9aed587c9a04983f; patch: 5.15.212; 3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5 <dc11be133efca5fe3a2fb02b016dee825cc12f18; patch: 6.6.145; 3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5 <2f4acd0fcd862e22eab45690ec2c08c80b6ef2e7; patch: 6.1.178; patch: 6.18.39; 3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5 <44f891bc088958399eec27f7604928694aa35581; patch: 7.2-rc4; 3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5 <b8c9aa832b52680ee40d6cab0efb081f9a69df05; 3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5 <e705d81a7193dd19e69b8e2bad4696d78a4ea075; 4.11; patch: 6.12.96; patch: 0; 3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5 <206c09b04dc5469c7ff14d8aceff2d47c88078d9
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.
- Linux — Linux
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