CVE-2026-31446

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: ext4: fix use-after-free in update_super_work when racing with umount Commit b98535d09179 ("ext4: fix bug_on in start_this_handle during umount filesystem") moved ext4_unregister_sysfs() before flushing s_sb_upd_work to prevent new error work from being queued via /proc/fs/ext4/xx/mb_groups reads during unmount. However, this introduced a use-after-free because update_super_work calls ext4_notify_error_sysfs() -> sysfs_notify() which accesses the kobject's kernfs_node after it has been freed by kobject_del() in ext4_unregis...

Affected product and versions

Product

Linux Linux, SIMATIC S7-1500 CPU 1518-4 PN/DP MFP, SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP

Affected versions

>= 52c3a04f9ec2a16a4204d6274db338cb8d5b2d74 < c8fe17a1b308c3d8c703ebfb049b325f844342c3, >= b98535d091795a79336f520b0708457aacf55c67 < c4d829737329f2290dd41e290b7d75effdb2a7ff, >= b98535d091795a79336f520b0708457aacf55c67 < 9449f99ba04f5dd1c8423ad8a90b3651d7240d1d, >= b98535d091795a79336f520b0708457aacf55c67 < 034053378dd81837fd6c7a43b37ee2e58d4f0b4e, >= b98535d091795a79336f520b0708457aacf55c67 < c97e282f7bfd0c3554c63d289964a5ca6a1d2ffe, >= b98535d091795a79336f520b0708457aacf55c67 < 08b10e6f37fc533a759e9833af0692242e8b3f93, >= b98535d091795a79336f520b0708457aacf55c67 < d15e4b0a418537aafa56b2cb80d44add83e83697, >= 585ef03c9e79672781f954daae730dfe24bf3a46, >= afe490e48d47df1b3f64012835c1bc2f075a8c8b, >= 5.15.38 < 5.15.203, >= 5.10.114 < 5.11, >= 5.17.6 < 5.18, >= 5.18, >= V3.1.6, >= V3.1.5, >= 5.18.1 < 6.1.168, >= 6.2 < 6.6.131, >= 6.7 < 6.12.80, >= 6.13 < 6.18.21, >= 6.19 < 6.19.11

Fixed versions

5.11, 5.15.203, 5.18, 6.1.168, 6.6.131, 6.12.80, 6.18.21, 6.19.11

Technical data

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CWE

CWE-416