CVE-2026-43065 (GCVE-0-2026-43065)

Vulnerability from cvelistv5 – Published: 2026-05-05 15:23 – Updated: 2026-05-11 22:17
VLAI
Title
ext4: always drain queued discard work in ext4_mb_release()
Summary
In the Linux kernel, the following vulnerability has been resolved: ext4: always drain queued discard work in ext4_mb_release() While reviewing recent ext4 patch[1], Sashiko raised the following concern[2]: > If the filesystem is initially mounted with the discard option, > deleting files will populate sbi->s_discard_list and queue > s_discard_work. If it is then remounted with nodiscard, the > EXT4_MOUNT_DISCARD flag is cleared, but the pending s_discard_work is > neither cancelled nor flushed. [1] https://lore.kernel.org/r/20260319094545.19291-1-qiang.zhang@linux.dev/ [2] https://sashiko.dev/#/patchset/20260319094545.19291-1-qiang.zhang%40linux.dev The concern was valid, but it had nothing to do with the patch[1]. One of the problems with Sashiko in its current (early) form is that it will detect pre-existing issues and report it as a problem with the patch that it is reviewing. In practice, it would be hard to hit deliberately (unless you are a malicious syzkaller fuzzer), since it would involve mounting the file system with -o discard, and then deleting a large number of files, remounting the file system with -o nodiscard, and then immediately unmounting the file system before the queued discard work has a change to drain on its own. Fix it because it's a real bug, and to avoid Sashiko from raising this concern when analyzing future patches to mballoc.c.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 55cdd0af2bc5ffc92a2deb745627755aecd5db33 , < e96c2354b170aaa53300c8e8fd59e41b133160f7 (git)
Affected: 55cdd0af2bc5ffc92a2deb745627755aecd5db33 , < c360e9d0def4f4ae03254a67c683103908555b75 (git)
Affected: 55cdd0af2bc5ffc92a2deb745627755aecd5db33 , < 1c82f863f090ab899085bdfade073313384b514b (git)
Affected: 55cdd0af2bc5ffc92a2deb745627755aecd5db33 , < 9b4d9dda6a71ad3425c8109d27c4c6bfb9da97b8 (git)
Affected: 55cdd0af2bc5ffc92a2deb745627755aecd5db33 , < 812b6a7cd3e7f3a3e8a24db85bc6313c26cb1098 (git)
Affected: 55cdd0af2bc5ffc92a2deb745627755aecd5db33 , < b4737e26d4688b8aea88ad6ea4dbfeb6e78b0327 (git)
Affected: 55cdd0af2bc5ffc92a2deb745627755aecd5db33 , < 9ee29d20aab228adfb02ca93f87fb53c56c2f3af (git)
Create a notification for this product.
Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 5.15.203 , ≤ 5.15.* (semver)
Unaffected: 6.1.168 , ≤ 6.1.* (semver)
Unaffected: 6.6.131 , ≤ 6.6.* (semver)
Unaffected: 6.12.80 , ≤ 6.12.* (semver)
Unaffected: 6.18.21 , ≤ 6.18.* (semver)
Unaffected: 6.19.11 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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  }
}


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