CVE-2026-64600 (GCVE-0-2026-64600)

Vulnerability from cvelistv5 – Published: 2026-07-23 05:46 – Updated: 2026-07-27 05:01
VLAI
Title
xfs: resample the data fork mapping after cycling ILOCK
Summary
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.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5 , < dc11be133efca5fe3a2fb02b016dee825cc12f18 (git)
Affected: 3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5 , < b8c9aa832b52680ee40d6cab0efb081f9a69df05 (git)
Affected: 3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5 , < 50f0012da1040f69a4e788cd9aed587c9a04983f (git)
Affected: 3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5 , < e705d81a7193dd19e69b8e2bad4696d78a4ea075 (git)
Affected: 3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5 , < 206c09b04dc5469c7ff14d8aceff2d47c88078d9 (git)
Affected: 3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5 , < 44f891bc088958399eec27f7604928694aa35581 (git)
Affected: 3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5 , < 2f4acd0fcd862e22eab45690ec2c08c80b6ef2e7 (git)
Create a notification for this product.
Linux Linux Affected: 4.11
Unaffected: 0 , < 4.11 (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.96 , ≤ 6.12.* (semver)
Unaffected: 6.18.39 , ≤ 6.18.* (semver)
Unaffected: 7.1.4 , ≤ 7.1.* (semver)
Unaffected: 7.2-rc4 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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      "cve": "CVE-2026-64600",
      "id": "CVE-2026-64600",
      "initial_release_date": "2026-07-14T00:00:00+00:00",
      "product_status:fixed": "1946",
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      "source": "Red Hat CSAF VEX",
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      "title": "kernel: XFS data corruption using reflink",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64600.json",
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}



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