CVE-2026-78410

LOWCVSS 7.8 · 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

A flaw was found in util-linux. Restricted bind mounts take the source path from fstab but do not pin that source before the privileged mount. A local unprivileged user who can replace the authorized source or a writable ancestor can redirect SUID mount(8) to bind another host directory. If the fstab entry also sets X-mount.owner, X-mount.group, or X-mount.mode, root then changes ownership or mode on that redirected inode.

Back to dashboard

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@UpwindMDR17h
🚨High - util-linux mount(8) TOCTOU in restricted bind mounts (CVE-2026-78410) util-linux mount(8) has a TOCTOU flaw where the bind mount source path read from /etc/fstab can be swapped before the privileged mount occurs. A local user who can replace the authorized source (or a writable ancestor) can redirect the SUID mount to bind an attacker-chosen directory; with X-mount.owner/X-mount.group/X-mount.mode set, root may chmod/chown the redirected inode. 👉Affected: util-linux (restricted bind mounts via /etc/fstab)
0000052
377 followersView on X

Explore more

Back to dashboard