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…
Summary
Vulnerability reported (CVE-2026-53612). Successful exploitation can lead to full system takeover. Exploitable via mount. Mitigation: upgrade to 2.41.5 or later.
Original description
The description as published by the source.
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.
Source: NIST National Vulnerability Database NVD
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-53612 has been found.
Attackers can target a specific entry point like mount over the network to misuse the product.
Successful exploitation can lead to full system takeover. CVSS score: 7.0/10.
What to do: upgrade the affected software to 2.41.5 or later.
If unsure, ask your IT team or search "CVE-2026-53612" on the vendor's site.
CVE-2026-53612 — CWE-367 / CVSS v3 7.0
Attack vector: local / no user interaction
Attack surface: mount / hook_owner.c / user / users
Patched: 2.41.5 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-367) has been reported. Attackers reach the vulnerable code path via mount.
Check the vendor advisory for the affected versions. Attack surface: mount / hook_owner.c / user / users.
Severity: High (CVSS 7.0/10). Successful exploitation can lead to full system takeover.
Update to 2.41.5.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
Audit SBOM/dependencies for affected components.資産台帳・SBOM・依存マニフェストで影響コンポーネントを特定する。
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2Apply patch patch
Upgrade to 2.41.5ステージング環境で 2.41.5 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
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3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Fix status by distribution
Fixed packages published by each distribution for this CVE
- BellSoft Alpaquita BELL-CVE-2026-53612 util-linux Fixed in: 2.41.5-r0