In the Linux kernel, the following vulnerability has been resolved: btrfs: don't propagate EXTENT_FLAG_LOGGING to split extent maps When btrfs_drop_extent_map_range() splits an extent map, the new split maps inherit the original map's flags through a local 'flags' variable. Commit f86f7a75e2fb ("btrfs: use the flags of an extent map to identify the compression type") changed the EXTENT_FLAG_LOGGING clearing to operate on em->flags instead of that local 'flags' copy, so a split of an extent map that is currently being logged wrongly inherits EXTENT_FLAG_LOGGING. The flag is then never cleared on the split, and when it is freed while still on the inode's modified_extents list (for example by the extent map shrinker) it trips the WARN_ON(!list_empty(&em->list)) in btrfs_free_extent_map() and leads to a use-after-free. Clear EXTENT_FLAG_LOGGING from the local 'flags' copy used for the splits and only clear EXTENT_FLAG_PINNED from em->flags, restoring the behaviour prior to f86f7a75e2fb.

Metrics

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00157.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

Vendors Products
Linux
  • Linux Kernel

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References
Link Providers
https://git.kernel.org/stable/c/0e465c63f103a5ce6849614d6bda048d70eebec8 cve-icon cve-icon
https://git.kernel.org/stable/c/2a9246a424f45f33a1b8367052611ebe874868ad cve-icon cve-icon
https://git.kernel.org/stable/c/5eff4d5b17fa1950e80bfd1ba43dc0699e61a644 cve-icon cve-icon
https://git.kernel.org/stable/c/9304713b70e7e1450e3a76e758836fe5391bfa95 cve-icon cve-icon
History

Wed, 12 Aug 2026 16:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-416

Wed, 12 Aug 2026 00:15:00 +0000

Type Values Removed Values Added
Description In the Linux kernel, the following vulnerability has been resolved: btrfs: don't propagate EXTENT_FLAG_LOGGING to split extent maps When btrfs_drop_extent_map_range() splits an extent map, the new split maps inherit the original map's flags through a local 'flags' variable. Commit f86f7a75e2fb ("btrfs: use the flags of an extent map to identify the compression type") changed the EXTENT_FLAG_LOGGING clearing to operate on em->flags instead of that local 'flags' copy, so a split of an extent map that is currently being logged wrongly inherits EXTENT_FLAG_LOGGING. The flag is then never cleared on the split, and when it is freed while still on the inode's modified_extents list (for example by the extent map shrinker) it trips the WARN_ON(!list_empty(&em->list)) in btrfs_free_extent_map() and leads to a use-after-free. Clear EXTENT_FLAG_LOGGING from the local 'flags' copy used for the splits and only clear EXTENT_FLAG_PINNED from em->flags, restoring the behaviour prior to f86f7a75e2fb.
Title btrfs: don't propagate EXTENT_FLAG_LOGGING to split extent maps
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-08-12T00:07:31.981Z

Reserved: 2026-07-30T09:28:09.394Z

Link: CVE-2026-68442

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-08-12T00:17:44.477

Modified: 2026-08-12T00:17:44.477

Link: CVE-2026-68442

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-12T16:00:04Z