CVE-2026-64600 | 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_co
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.
- 🔗 git.kernel.org/stable/c/dc11be133efca5fe3a2fb02b016dee82…
- 🔗 git.kernel.org/stable/c/b8c9aa832b52680ee40d6cab0efb081f…
- 🔗 git.kernel.org/stable/c/50f0012da1040f69a4e788cd9aed587c…
- 🔗 git.kernel.org/stable/c/e705d81a7193dd19e69b8e2bad4696d7…
- 🔗 git.kernel.org/stable/c/206c09b04dc5469c7ff14d8aceff2d47…
- 🔗 git.kernel.org/stable/c/44f891bc088958399eec27f760492869…
- 🔗 git.kernel.org/stable/c/2f4acd0fcd862e22eab45690ec2c08c8…
- 🔗 cdn2.qualys.com/advisory/2026/07/22/RefluXFS.txt
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CVE-2026-64600 | 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_co
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