CVE-2025-38058
Description
In the Linux kernel, the following vulnerability has been resolved: __legitimize_mnt(): check for MNT_SYNC_UMOUNT should be under mount_lock ... or we risk stealing final mntput from sync umount - raising mnt_count after umount(2) has verified that victim is not busy, but before it has set MNT_SYNC_UMOUNT; in that case __legitimize_mnt() doesn't see that it's safe to quietly undo mnt_count increment and leaves dropping the reference to caller, where it'll be a full-blown mntput(). Check under mount_lock is needed; leaving the current one done before taking that makes no sense - it's nowhere near common enough to bother with.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| sles | affected | | |
| debian | bookworm | fixed | 6.1.147-1 |
| debian | bullseye | fixed | 5.10.244-1 |
| debian | forky | fixed | 6.12.32-1 |
| debian | sid | fixed | 6.12.32-1 |
| debian | trixie | fixed | 6.12.32-1 |
| linux-kernel | affected | 5.4.294 | |
| linux-kernel | 6.15 | affected | |
| debian | 11.0 | affected | |
References
- https://git.kernel.org/stable/c/250cf3693060a5f803c5f1ddc082bb06b16112a9
- https://git.kernel.org/stable/c/628fb00195ce21a90cf9e4e3d105cd9e58f77b40
- https://git.kernel.org/stable/c/8cafd7266fa02e0863bacbf872fe635c0b9725eb
- https://git.kernel.org/stable/c/9b0915e72b3cf52474dcee0b24a2f99d93e604a3
- https://git.kernel.org/stable/c/b55996939c71a3e1a38f3cdc6a8859797efc9083
- https://git.kernel.org/stable/c/b89eb56a378b7b2c1176787fc228d0a57172bdd5
- https://git.kernel.org/stable/c/d8ece4ced3b051e656c77180df2e69e19e24edc1
- https://git.kernel.org/stable/c/f6d45fd92f62845cbd1eb5128fd8f0ed7d0c5a42
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html
- https://www.suse.com/security/cve/CVE-2025-38058.html
- https://security-tracker.debian.org/tracker/CVE-2025-38058
CWEs
CWE-667
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.