CVE-2026-43065 ext4: always drain queued discard work in ext4_mb_release()

In the Linux kernel, the following vulnerability has been resolved: ext4: always drain queued discard work in ext4mbrelease While reviewing recent ext4 patch1, Sashiko raised the following concern2: If the filesystem is initially mounted with the discard option, deleting files will populate...

CVE-2026-43065

CVE-2026-43065 concerns the Linux kernel ext4 subsystem. The issue arises in ext4_mb_release() where, if a filesystem is mounted with -o discard and files are deleted, sbi->s_discard_list accumulates and s_discard_work is queued; if the filesystem is later remounted with nodiscard and the EXT4...