CVE-2026-27456

MEDIUMNVD 4.74.7
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

This medium-severity CVE scores 4.7 under NVD CVSS v3. EPSS exploit probability: 0.1% (1st percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3
Trending — 3 sources updated this weekElevated
4.7EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.1%CVSS: 4.7Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

util-linux is a random collection of Linux utilities. Prior to version 2.41.4, a TOCTOU (Time-of-Check-Time-of-Use) vulnerability has been identified in the SUID binary /usr/bin/mount from util-linux. The mount binary, when setting up loop devices, validates the source file path with user privileges via fork() + setuid() + realpath(), but subsequently re-canonicalizes and opens it with root privileges (euid=0) without verifying that the path has not been replaced between both operations. Neither O_NOFOLLOW, nor inode comparison, nor post-open fstat() are employed. This allows a local unprivileged user to replace the source file with a symlink pointing to any root-owned file or device during the race window, causing the SUID binary to open and mount it as root. Exploitation requires an /etc/fstab entry with user,loop options whose path points to a directory where the attacker has write permission, and that /usr/bin/mount has the SUID bit set (the default configuration on virtually all Linux distributions). The impact is unauthorized read access to root-protected files and block devices, including backup images, disk volumes, and any file containing a valid filesystem. This issue has been patched in version 2.41.4.

CVSS v3
4.7
EG Score
4.7MEDIUMmedium confidence
EG Risk
37
EG Risk 37/100

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 (value × EchelonGraph’s weight)
Severity47% × 45%
The EG Score, 4.7 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.1%
EPSS %ILE
1st
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

April 3, 2026

Last Modified

July 24, 2026

Advisory Details (2)

Auto-updated Jul 26, 2026
Patch available. Sources: github_commit, github.
GitHub advisoryMentions a patch (unverified)

TOCTOU Race Condition in util-linux mount(8) - Loop Device Setup · Advisory · util-linux/util-linux · GitHub

https://github.com/util-linux/util-linux/security/advisories/GHSA-qq4x-vfq4-9h9g
GitHub commit

commit 5e390467b26a (util-linux/util-linux)

Fix landed in util-linux/util-linux commit 5e390467b26a — awaiting tagged release

https://github.com/util-linux/util-linux/commit/5e390467b26a3cf3fecc04e1a0d482dff3162fc4

Vendor Advisories for CVE-2026-27456(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 / EcosystemFix (by version range) / PatchReleasedSource
redhatutil-linux-main-2.42-7.1.hum12026-04-09redhat

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

(7 across 7 ecosystems)
Alpine:v3.22(1)
PackageVulnerable rangeFix by version rangeDependents
util-linux—
  • every version up to 2.41.6-r0: fixed in 2.41.6-r0
—
Alpine:v3.23(1)
PackageVulnerable rangeFix by version rangeDependents
util-linux—
  • every version up to 2.41.4-r0: fixed in 2.41.4-r0
—
Alpine:v3.24(1)
PackageVulnerable rangeFix by version rangeDependents
util-linux—
  • every version up to 2.41.4-r0: fixed in 2.41.4-r0
  • every version up to 2.42.3-r0: fixed in 2.42.3-r0
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
util-linux2.36.1-8 ... 2.42~rc2-1 (140 versions)
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
util-linux2.38.1-5 ... 2.42~rc2-1 (120 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
util-linux2.41-5 ... 2.41.3-4 (13 versions)
  • every version up to 2.41.5-0+deb13u1: fixed in 2.41.5-0+deb13u1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
util-linux2.41-5 ... 2.42~rc2-1 (17 versions)
  • every version up to 2.42-1: fixed in 2.42-1
—

Weakness Classification(3)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 27× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 93 of 200 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 7 repeat rows among the latest 100 are merged into the row they repeat. The 107 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  2. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  3. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  4. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  5. 2026-10-12 16:17 UTCEG score recompute
  6. 2026-10-11 19:59 UTCEG score recompute
  7. 2026-10-11 17:13 UTCEG score recompute
  8. 2026-10-11 14:44 UTCEG score recompute
  9. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  10. 2026-10-11 00:52 UTCOSV refresh
  11. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  12. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  13. 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  14. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  15. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  16. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  17. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  18. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  19. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  20. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  21. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  22. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  23. 2026-09-26 00:26 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  24. 2026-09-21 12:49 UTCOSV refresh
  25. 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.1% · 1st percentile
Show 68 more
  1. 2026-09-17 19:30 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  2. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  3. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  4. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  5. 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  6. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  7. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  8. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  9. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  10. 2026-09-02 10:04 UTCOSV refresh
  11. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  12. 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  13. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  14. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  15. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  16. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  17. 2026-08-25 13:48 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  18. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  19. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  20. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  21. 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  22. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  23. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  24. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  25. 2026-08-16 08:34 UTCEG score recompute
  26. 2026-08-16 08:34 UTCVendor advisory
  27. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  28. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  29. 2026-08-14 05:41 UTCEG score recompute
  30. 2026-08-14 05:41 UTCVendor advisory
  31. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  32. 2026-08-12 19:56 UTCEG score recompute
  33. 2026-08-12 19:56 UTCVendor advisory
  34. 2026-08-12 13:50 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  35. 2026-08-11 07:34 UTCEG score recompute
  36. 2026-08-11 07:34 UTCVendor advisory
  37. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  38. 2026-08-10 06:23 UTCVendor advisory
  39. 2026-08-09 05:12 UTCEG score recompute
  40. 2026-08-09 05:12 UTCVendor advisory
  41. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  42. 2026-08-07 15:19 UTCEG score recompute
  43. 2026-08-07 15:19 UTCVendor advisory
  44. 2026-08-06 13:46 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  45. 2026-08-06 00:16 UTCEG score recompute
  46. 2026-08-06 00:16 UTCVendor advisory
  47. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  48. 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  49. 2026-08-03 22:37 UTCEG score recompute
  50. 2026-08-03 22:37 UTCVendor advisory
  51. 2026-08-03 10:36 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  52. 2026-08-02 14:33 UTCEG score recompute
  53. 2026-08-02 14:33 UTCVendor advisory
  54. 2026-08-02 02:26 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  55. 2026-08-01 04:16 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  56. 2026-07-30 16:27 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  57. 2026-07-30 01:30 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  58. 2026-07-28 15:36 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  59. 2026-07-26 09:16 UTCEG score recompute
  60. 2026-07-26 09:16 UTCVendor advisory
  61. 2026-07-25 14:17 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  62. 2026-07-24 14:17 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  63. 2026-07-23 14:18 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  64. 2026-07-23 03:08 UTCEG score recompute
  65. 2026-07-22 14:08 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  66. 2026-07-21 15:24 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  67. 2026-07-20 17:08 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  68. 2026-07-19 14:31 UTCEPSS rescoreEPSS 0.1% · 2nd percentile

Related CVEs(same product + same vendor + same CWE)

Same vendor

2 shown

redhat:RHSA-2026:7180

Frequently asked(5)

What is CVE-2026-27456?
CVE-2026-27456 is a medium-severity vulnerability; its CVE record was published on April 3, 2026. util-linux is a random collection of Linux utilities. Prior to version 2.41.4, a TOCTOU (Time-of-Check-Time-of-Use) vulnerability has been identified in the SUID binary /usr/bin/mount from util-linux. The mount binary, when setting up loop devices, validates the source file path with user…
When was the CVE record for CVE-2026-27456 published?
The CVE record for CVE-2026-27456 was published on April 3, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of July 24, 2026; the record at its source may have been updated since.
Is CVE-2026-27456 actively exploited?
CVE-2026-27456 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (1st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-27456?
CVE-2026-27456 has a CVSS v3 base score of 4.7 (NVD).
How do I remediate CVE-2026-27456?
A fix for CVE-2026-27456 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-27456 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-27456

Explore →

Is Your Infrastructure Affected by CVE-2026-27456?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs