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.
CVE-2026-53612
HIGHPre-NVD 7.07.0Trending — 4 sources updated this weekElevatedEG-KEV Tier 3: ElevatedEG-KEV is EchelonGraph's own tiering of exploitation signals from CISA KEV, CISA's SSVC data (Vulnrichment), ransomware data, public exploit-code references and EPSS.Tier 3 is not evidence of exploitation. It means public exploit code is referenced, or CISA's SSVC data says "public PoC", or EPSS ranks the CVE in the top 5%.Signals for this CVE: CISA's SSVC exploitation value: public PoC.EchelonGraph confidence 38%: a heuristic from the tier and the number of signals, not a measured probability.
EchelonGraph scoreLOW confidence
This high-severity CVE scores 7.0 under a secondary CVSS source (NVD's own analysis pending). 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 a secondary CVSS source
Sources: a secondary CVSS source
7.0EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (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: 7.0Exploit: No code on recordExposed services: Not assessed
A fix is available — apply it.
- CVSS v3
- 7.0
- EG Score
- 7.0HIGHlow confidence
- EG Risk
- 48EG Risk 48/100
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)Severity70% × 45%The EG Score, 7.0 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, Track* at medium and Attend at high mission impact.Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (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 at low or medium mission impact and sooner than that at high. - EPSS PROB
- 0.1%
- EPSS %ILE
- 1st
- KEV
- Not listed
SSVC (CISA's decision table, applied by EchelonGraph)Track at low, Track* at medium and Attend at high mission impact.
A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (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)14 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 total (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
October 14, 2026
Last Modified
October 14, 2026
Advisory Details (5)
Auto-updated Oct 14, 2026🔬 Proof of concept available. Patch available. Sources: github_commit, github.
GitHub commit
commit d0c5adaeb3a3 (util-linux/util-linux)
Fix landed in util-linux/util-linux commit d0c5adaeb3a3 — awaiting tagged release
https://github.com/util-linux/util-linux/commit/d0c5adaeb3a3d823aba1377794de8f009b8152ccGitHub commit
commit 897a08c2b11d (util-linux/util-linux)
Fix landed in util-linux/util-linux commit 897a08c2b11d — awaiting tagged release
https://github.com/util-linux/util-linux/commit/897a08c2b11dfa66975c3d24d63c7bf5f5be1a7cGitHub commit
commit 722c96974dd4 (util-linux/util-linux)
Fix landed in util-linux/util-linux commit 722c96974dd4 — awaiting tagged release
https://github.com/util-linux/util-linux/commit/722c96974dd4009a334e4aee556eedaab5fb94b4GitHub commit
commit 24da33905c71 (util-linux/util-linux)
Fix landed in util-linux/util-linux commit 24da33905c71 — awaiting tagged release
https://github.com/util-linux/util-linux/commit/24da33905c7115c4cbccd0afb2a469804e96467aGitHub advisoryMentions a patch (unverified)🟡 PoC Available
Local Privilege Escalation via TOCTOU in mount(8) hook_owner.c chmod/chown · Advisory · util-linux/util-linux · GitHub
https://github.com/util-linux/util-linux/security/advisories/GHSA-g8wm-75wr-g2vhPatch Availability(1)
| Vendor / Ecosystem | Fix (by version range) / Patch | Released | Source |
|---|---|---|---|
| ubuntu | uuid-runtime (2.41.3-3ubuntu2.2) @ resolute | 2026-10-14 | ubuntu |
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.
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
All Vendor Advisories
(1)
Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.
Data Freshness Timeline
(refreshed 10× in last 7d / 10× 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.
- 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.1% · 1st percentile
- 2026-10-14 19:27 UTCEG score recompute
- 2026-10-14 19:27 UTCVendor advisory
- 2026-10-14 18:37 UTCEG score recompute
- 2026-10-14 18:37 UTCVendor advisory
- 2026-10-14 15:31 UTCEG score recompute
- 2026-10-14 15:31 UTCVendor advisory
- 2026-10-14 15:01 UTCEG score recomputeFirst assessed: 7.0 HIGH
- 2026-10-14 15:01 UTCVendor advisory
- 2026-10-14 14:59 UTCMITRE cvelistV5first tracked
Related CVEs(same vendor + same CWE)
Same vendor
4 shownubuntu:USN-8702-1
Frequently asked(5)
What is CVE-2026-53612?
CVE-2026-53612 is a high-severity vulnerability; its CVE record was published on October 14, 2026. 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 hookowner.c post-mount hook performs path-based chmod() and lchown() operations on a previously validated mount target. A local low-privileged user authorized by…
When was the CVE record for CVE-2026-53612 published?
The CVE record for CVE-2026-53612 was published on October 14, 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 October 14, 2026; the record at its source may have been updated since.
Is CVE-2026-53612 actively exploited?
CVE-2026-53612 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-2026-53612?
CVE-2026-53612 has a CVSS base score of 7.0 (a secondary CVSS source that NVD displays; NVD's own analysis pending). The EG score is currently aggregating — additional source signals are being incorporated as they become available..
How do I remediate CVE-2026-53612?
A fix for CVE-2026-53612 is available: update to the fixed version the vendor names in its advisory.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-53612
Is Your Infrastructure Affected by CVE-2026-53612?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.