CVE-2026-76642

HIGHPre-NVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.8 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 93% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 3 sources updated this weekElevated
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: Elevated riskExposed: 0

A fix is available — apply it.

util-linux versions through 2.41.5 and 2.42.2 fail to check mount helper exit status before running post-mount hooks, allowing unprivileged users to execute privileged operations on pre-existing filesystems. Attackers can exploit X-mount.idmap or X-mount.owner hooks to clone filesystems with inherited suid bits or modify target inode permissions after a helper fails, achieving privilege escalation.

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
51(Track*)
EG Risk 51/100SSVC: Track*

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity78% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
0%
EPSS %ILE
7%
KEV
Not listed

Published

September 3, 2026

Last Modified

September 3, 2026

Advisory Details (8)

Auto-updated Sep 3, 2026
Patch available. Sources: github, github_commit.
generic

util-linux libmount Privilege Escalation via Failed Mount Helper | Advisories | VulnCheck

https://www.vulncheck.com/advisories/util-linux-libmount-privilege-escalation-via-failed-mount-helper
generic

GitHub - util-linux/util-linux · GitHub

https://github.com/util-linux/util-linux
generic

util-linux/libmount/src/context_mount.c at v2.42.2 · util-linux/util-linux · GitHub

https://github.com/util-linux/util-linux/blob/v2.42.2/libmount/src/context_mount.c#L892
generic

util-linux/libmount/src/context_mount.c at v2.42.2 · util-linux/util-linux · GitHub

https://github.com/util-linux/util-linux/blob/v2.42.2/libmount/src/context_mount.c#L476
github_commit

commit a15c00a9e545 (util-linux/util-linux)

Fix landed in util-linux/util-linux commit a15c00a9e545 — awaiting tagged release

https://github.com/util-linux/util-linux/commit/a15c00a9e545aa8b9cf6ec0f888ff6c7b3eaeedc
github_commit

commit 1d14676ea700 (util-linux/util-linux)

Fix landed in util-linux/util-linux commit 1d14676ea700 — awaiting tagged release

https://github.com/util-linux/util-linux/commit/1d14676ea70003e9f5b2a6a76af0cadb1190411a
github_commit

commit f57cea130839 (util-linux/util-linux)

Fix landed in util-linux/util-linux commit f57cea130839 — awaiting tagged release

https://github.com/util-linux/util-linux/commit/f57cea130839c0af8dc0525274267ae4cfd66bbf
github Patch Available

Failed external mount helper still triggers privileged X-mount post-hooks, enabling deterministic local privilege escalation · Advisory · util-linux/util-linux · GitHub

https://github.com/util-linux/util-linux/security/advisories/GHSA-m25x-3hj9-m26f

Vendor Advisories for CVE-2026-76642(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatutil-linux-main-2.42.2-3.4.hum12026-09-03redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(6 across 6 ecosystems)
Alpine:v3.22(1)
PackageVulnerable rangeFixed inDependents
util-linux—2.41.6-r0—
Alpine:v3.23(1)
PackageVulnerable rangeFixed inDependents
util-linux—2.41.6-r0—
Alpine:v3.24(1)
PackageVulnerable rangeFixed inDependents
util-linux—2.42.3-r0—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
util-linux2.38.1-5 ... 2.42~rc2-1 (119 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
util-linux2.41-5 ... 2.42~rc2-1 (35 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
util-linux2.41-5 ... 2.42~rc2-1 (34 versions)——

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 26× in last 7d / 60× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-19 14:05 UTCVendor advisory
  2. 2026-09-19 01:14 UTCEG score recompute
  3. 2026-09-19 01:14 UTCVendor advisory
  4. 2026-09-18 19:28 UTCEPSS rescore
  5. 2026-09-18 12:36 UTCVendor advisory
  6. 2026-09-17 23:57 UTCEG score recompute
  7. 2026-09-17 23:57 UTCVendor advisory
  8. 2026-09-17 10:21 UTCVendor advisory
  9. 2026-09-16 21:42 UTCEG score recompute
  10. 2026-09-16 21:42 UTCVendor advisory
  11. 2026-09-16 14:08 UTCEPSS rescore
  12. 2026-09-16 09:03 UTCEG score recompute
  13. 2026-09-16 09:03 UTCVendor advisory
  14. 2026-09-16 05:15 UTCEPSS rescore
  15. 2026-09-15 19:44 UTCVendor advisory
  16. 2026-09-15 07:02 UTCEG score recompute
  17. 2026-09-15 07:02 UTCVendor advisory
  18. 2026-09-15 03:12 UTCEPSS rescore
  19. 2026-09-14 18:23 UTCVendor advisory
  20. 2026-09-14 05:38 UTCVendor advisory
  21. 2026-09-13 17:00 UTCEG score recompute
  22. 2026-09-13 17:00 UTCVendor advisory
  23. 2026-09-13 04:22 UTCVendor advisory
  24. 2026-09-12 15:43 UTCEG score recompute
  25. 2026-09-12 15:43 UTCVendor advisory
Show 35 more
  1. 2026-09-12 15:02 UTCEPSS rescore
  2. 2026-09-12 03:04 UTCEG score recompute
  3. 2026-09-12 03:04 UTCVendor advisory
  4. 2026-09-11 14:53 UTCEPSS rescore
  5. 2026-09-11 14:25 UTCEG score recompute
  6. 2026-09-11 14:25 UTCVendor advisory
  7. 2026-09-11 01:46 UTCVendor advisory
  8. 2026-09-10 13:07 UTCEG score recompute
  9. 2026-09-10 13:07 UTCVendor advisory
  10. 2026-09-10 09:35 UTCEPSS rescore
  11. 2026-09-10 00:28 UTCVendor advisory
  12. 2026-09-09 11:48 UTCVendor advisory
  13. 2026-09-08 23:10 UTCEG score recompute
  14. 2026-09-08 23:10 UTCVendor advisory
  15. 2026-09-08 22:01 UTCEPSS rescore
  16. 2026-09-08 09:59 UTCVendor advisory
  17. 2026-09-07 20:47 UTCEG score recompute
  18. 2026-09-07 20:47 UTCVendor advisory
  19. 2026-09-07 08:08 UTCVendor advisory
  20. 2026-09-06 19:29 UTCEG score recompute
  21. 2026-09-06 19:29 UTCVendor advisory
  22. 2026-09-06 13:48 UTCEPSS rescore
  23. 2026-09-06 06:49 UTCVendor advisory
  24. 2026-09-05 18:11 UTCEG score recompute
  25. 2026-09-05 18:11 UTCVendor advisory
  26. 2026-09-05 05:29 UTCVendor advisory
  27. 2026-09-04 16:50 UTCEG score recompute
  28. 2026-09-04 16:50 UTCVendor advisory
  29. 2026-09-04 05:07 UTCEPSS rescore
  30. 2026-09-04 04:12 UTCVendor advisory
  31. 2026-09-03 15:31 UTCEG score recompute
  32. 2026-09-03 14:21 UTCEG score recompute
  33. 2026-09-03 13:15 UTCEG score recompute
  34. 2026-09-03 11:04 UTCEG score recompute
  35. 2026-09-03 11:04 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-76642?
CVE-2026-76642 is a high vulnerability published on September 3, 2026. util-linux versions through 2.41.5 and 2.42.2 fail to check mount helper exit status before running post-mount hooks, allowing unprivileged users to execute privileged operations on pre-existing filesystems. Attackers can exploit X-mount.idmap or X-mount.owner hooks to clone filesystems with…
When was CVE-2026-76642 disclosed?
CVE-2026-76642 was first published in the National Vulnerability Database on September 3, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-76642 actively exploited?
CVE-2026-76642 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 92.6% of all scored CVEs.
What is the CVSS score of CVE-2026-76642?
CVE-2026-76642 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-76642?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-76642, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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