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

Vulnerability from cvelistv5 – Published: 2026-07-23 05:46 – Updated: 2026-08-17 04:58
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 CPE status
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)
guessed 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 , ≤ * (original_commit_for_fix)
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Party Advisory\"]},{\"url\":\"https://git.kernel.org/stable/c/206c09b04dc5469c7ff14d8aceff2d47c88078d9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/2f4acd0fcd862e22eab45690ec2c08c80b6ef2e7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/44f891bc088958399eec27f7604928694aa35581\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/50f0012da1040f69a4e788cd9aed587c9a04983f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/b8c9aa832b52680ee40d6cab0efb081f9a69df05\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/dc11be133efca5fe3a2fb02b016dee825cc12f18\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e705d81a7193dd19e69b8e2bad4696d78a4ea075\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"http://www.openwall.com/lists/oss-security/2026/07/22/14\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\",\"Exploit\"]},{\"url\":\"http://www.openwall.com/lists/oss-security/2026/07/22/18\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\"]},{\"url\":\"http://www.openwall.com/lists/oss-security/2026/07/22/19\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\"]},{\"url\":\"http://www.openwall.com/lists/oss-security/2026/07/31/3\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\"]},{\"url\":\"http://www.openwall.com/lists/oss-security/2026/08/03/4\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\"]},{\"url\":\"http://www.openwall.com/lists/oss-security/2026/08/03/8\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-07-30T07:35:48+00:00",
      "cve": "CVE-2026-64600",
      "id": "CVE-2026-64600",
      "initial_release_date": "2026-07-14T00:00:00+00:00",
      "product_status:fixed": "2134",
      "product_status:known_affected": "23",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: XFS data corruption using reflink",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64600.json",
      "version": "3"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.