CVE-2025-38058__legitimize_mnt(): check for MNT_SYNC_UMOUNT should be under mount_lock
Updated under an hour ago ()
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It affects Linux and 5 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 15, 2026
Affected products
Linux Linux linux:linux (from the name) | from 48a066e72d970a3e225a9c18690d570c736fc455 before 628fb00195ce21a90cf9e4e3d105cd9e58f77b40; from 48a066e72d970a3e225a9c18690d570c736fc455 before b89eb56a378b7b2c1176787fc228d0a57172bdd5; from 48a066e72d970a3e225a9c18690d570c736fc455 before f6d45fd92f62845cbd1eb5128fd8f0ed7d0c5a42; 48a066e72d970a3e225a9c18690d570c736fc455 builds before 9b0915e72b3cf52474dcee0b24a2f99d93e604a3; from 48a066e72d970a3e225a9c18690d570c736fc455 before d8ece4ced3b051e656c77180df2e69e19e24edc1; 48a066e72d970a3e225a9c18690d570c736fc455 builds before 8cafd7266fa02e0863bacbf872fe635c0b9725eb; from 48a066e72d970a3e225a9c18690d570c736fc455 before b55996939c71a3e1a38f3cdc6a8859797efc9083; from 48a066e72d970a3e225a9c18690d570c736fc455 before 250cf3693060a5f803c5f1ddc082bb06b16112a9 | CNA record |
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.5 | CISA ADP |
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name) | from V3.1.5 | CISA ADP |
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.5 | CISA ADP |
linux linux_kernel linux:linux_kernel | before 5.4.294; from 5.5 before 5.10.238; from 5.11 before 5.15.185; from 5.16 before 6.1.141; from 6.2 before 6.6.93; from 6.7 before 6.12.31; from 6.13 before 6.14.9; 6.15; and 4 more ranges | NVD |
debian debian_linux debian:debian_linux | 11.0 | NVD |
References
- https://git.kernel.org/stable/c/628fb00195ce21a90cf9e4e3d105cd9e58f77b40patch
- https://git.kernel.org/stable/c/b89eb56a378b7b2c1176787fc228d0a57172bdd5patch
- https://git.kernel.org/stable/c/f6d45fd92f62845cbd1eb5128fd8f0ed7d0c5a42patch
- https://git.kernel.org/stable/c/9b0915e72b3cf52474dcee0b24a2f99d93e604a3patch
- https://git.kernel.org/stable/c/d8ece4ced3b051e656c77180df2e69e19e24edc1patch
- https://git.kernel.org/stable/c/8cafd7266fa02e0863bacbf872fe635c0b9725ebpatch
- https://git.kernel.org/stable/c/b55996939c71a3e1a38f3cdc6a8859797efc9083patch
- https://git.kernel.org/stable/c/250cf3693060a5f803c5f1ddc082bb06b16112a9patch
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.htmlthird-party-advisory
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.htmlthird-party-advisory
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.