CVE-2026-64600 Affecting kernel-debug-devel package, versions <0:4.18.0-553.144.1.el8_10


Severity

Recommended
high

Based on Rocky Linux security rating.

Threat Intelligence

EPSS
0.64% (47th percentile)

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  • Snyk IDSNYK-ROCKY8-KERNELDEBUGDEVEL-18230681
  • published23 Jul 2026
  • disclosed23 Jul 2026

Introduced: 23 Jul 2026

NewCVE-2026-64600  (opens in a new tab)

How to fix?

Upgrade Rocky-Linux:8 kernel-debug-devel to version 0:4.18.0-553.144.1.el8_10 or higher.
This issue was patched in RLSA-2026:39179.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-debug-devel package and not the kernel-debug-devel package as distributed by Rocky-Linux. See How to fix? for Rocky-Linux:8 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1