CVE-2026-78410: util-linux
Vulnerability summary
CVE-2026-78410 is a high (CVSS 7.8) vulnerability in util-linux. EPSS estimates a 0.16% chance of exploitation in the next 30 days, higher than 4.3% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 6 · Duplicates 1 · Related 5Timeline
- 02-09-2026PublishedVulnerability first disclosed.
- 04-09-2026Last modifiedVulnerability information updated.
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.
CVSS metrics
5 scores · 5 sources · 1 version- OSV · AlpineEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · UbuntuEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- NVDNIST7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.16%
Chance of exploitation in the next 30 days
Percentile
4%
Versus all other CVEs
30-day change
+0.06 pp
From 0.10% on 20-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Alpine1 product
- util-linux< 2.41.6-r0 | < 2.42.3-r0
Debian1 product
- util-linuxAll versions (No fix recorded) | < 2.42.3-1
Ubuntu1 product
- util-linuxAll versions (No fix recorded)
3 vendors · 3 products
