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CVE-2026-64600

xfs: resample the data fork mapping after cycling ILOCK

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.15.212, 6.1.178, 6.6.145, 6.12.96, 6.18.39, and 1 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: total

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From 3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5 · fixed in dc11be133efca5fe3a2fb02b016dee825cc12f18; From 3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5 · fixed in b8c9aa832b52680ee40d6cab0efb081f9a69df05; From 3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5 · fixed in 50f0012da1040f69a4e788cd9aed587c9a04983f; From 3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5 · fixed in e705d81a7193dd19e69b8e2bad4696d78a4ea075; From 3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5 · fixed in 206c09b04dc5469c7ff14d8aceff2d47c88078d9; From 3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5 · fixed in 44f891bc088958399eec27f7604928694aa35581; From 3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5 · fixed in 2f4acd0fcd862e22eab45690ec2c08c80b6ef2e7

  • Linux Linux

    4.11

  • KernelLinux

    From 4.11.0 · fixed in 5.15.212; From 5.16.0 · fixed in 6.1.178; From 6.2.0 · fixed in 6.6.145; From 6.7.0 · fixed in 6.12.96; From 6.13.0 · fixed in 6.18.39; From 6.19.0 · fixed in 7.1.4

References 8

git.kernel.org

cdn2.qualys.com