CVE-2026-64600 - xfs: resample the data fork mapping after cycling ILOCK

CVE-2026-64600 - xfs: resample the data fork mapping after cycling ILOCK

https://cvefeed.io/rssfeed/latest.atom / Thu, 07/23/2026 - 10:07
CVE ID :CVE-2026-64600
Published : July 23, 2026, 6:16 a.m. | 33 minutes ago
Description :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: 0.0 | NA
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