CVE-2026-53612

LOWCVSS 7.0 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

util-linux is a random collection of Linux utilities. In util-linux 2.39 through 2.41.4 and 2.42 through 2.42.1, the SUID `mount` utility's `hook_owner.c` post-mount hook performs path-based `chmod()` and `lchown()` operations on a previously validated mount target. A local low-privileged user authorized by an `/etc/fstab` entry with `user` or `users` and an `X-mount.mode`, `X-mount.owner`, or `X-mount.group` option can use `renameat2(RENAME_EXCHANGE)` to race a writable ancestor of the target and redirect the privileged ownership or mode change to a root-owned path, potentially gaining root privileges. This issue is fixed in 2.41.5 and 2.42.2.

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0.0/ 10 priority

Sources & remediation

Other references

Weakness type (CWE)

CWE-367

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

NONE

Threat summary

1 mentions across 1 observed day

What's happening

1 total mentions across 1 day

Deep dive

Activity timeline1 mentions / 1d

Full discourse1 post

Upwind Security MDR@UpwindMDR1d
🚨High - util-linux mount(8) TOCTOU Local Privilege Escalation (CVE-2026-53612, CVE-2026-53613) The SUID mount(8) binary in util-linux validates paths before acting on them but does not pin them, leaving race windows a local unprivileged user can exploit. By swapping a path component between the check and the use, an attacker can redirect a user-permitted mount (fstab user/users option) to an arbitrary root-owned location, or make mount's post-mount chown/chmod apply to root-owned files, potentially escalating to root. 👉Upgrade to util-linux 2.42.2.
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