Answer in brief
CVE-2026-43065 records a Unknown severity vulnerability in ext4: always drain queued discard work in ext4_mb_release(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=55cdd0af2bc5ffc92a2deb745627755aecd5db33 <e96c2354b170aaa53300c8e8fd59e41b133160f7 || >=55cdd0af2bc5ffc92a2deb745627755aecd5db33 <c360e9d0def4f4ae03254a67c683103908555b75 || >=55cdd0af2bc5ffc92a2deb745627755aecd5db33 <1c82f863f090ab899085bdfade073313384b514b || >=55cdd0af2bc5ffc92a2deb745627755aecd5db33 <9b4d9dda6a71ad3425c8109d27c4c6bfb9da97b8 || >=55cdd0af2bc5ffc92a2deb745627755aecd5db33 <812b6a7cd3e7f3a3e8a24db85bc6313c26cb1098 || >=55cdd0af2bc5ffc92a2deb745627755aecd5db33 <b4737e26d4688b8aea88ad6ea4dbfeb6e78b0327 || >=55cdd0af2bc5ffc92a2deb745627755aecd5db33 <9ee29d20aab228adfb02ca93f87fb53c56c2f3af | e96c2354b170aaa53300c8e8fd59e41b133160f7, c360e9d0def4f4ae03254a67c683103908555b75, 1c82f863f090ab899085bdfade073313384b514b, 9b4d9dda6a71ad3425c8109d27c4c6bfb9da97b8, 812b6a7cd3e7f3a3e8a24db85bc6313c26cb1098, b4737e26d4688b8aea88ad6ea4dbfeb6e78b0327, 9ee29d20aab228adfb02ca93f87fb53c56c2f3af |
| Linux/Linuxgeneric | 5.15 | Not reported |
Published upstream
May 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Nov 6, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Nov 6, 2026
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/[email protected]/ [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.
Quoted source text, attributed separately from HOL analysis.