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Fencer Intel
high 7.0

CVE-2026-53613 json

util-linux mount target TOCTOU allows local privilege escalation

published 4mo ago modified 26d ago also EUVD-2026-101124 , GHSA-8gj5-72r3-428g

Unreviewed: the maintainers' own advisory

Published by the maintainers on their GitHub repository util-linux/util-linux. GitHub has not reviewed it into the GitHub Advisory Database, so the affected packages and versions are the maintainers' word. Read the full advisory on GitHub.

cvss
7.0
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 5%
public exploits
0
none known

Summary

util-linux is a random collection of Linux utilities. In util-linux 2.17 through 2.41.6 and 2.42 through 2.42.3, and in 2.42.4 when the legacy `mount(2)` path is used without `/proc`, restricted non-root `mount` requests validate an `/etc/fstab` target before the mount operation re-resolves that pathname. A local low-privileged user authorized by an fstab `user` or `users` entry whose target has an attacker-writable ancestor can use `renameat2(RENAME_EXCHANGE)` to swap a path component and redirect an authorized mount to a root-owned location, such as mounting attacker-controlled content over `/etc/sudoers.d`, and thereby gain root privileges. Versions 2.41.5 and 2.42.2 pin targets for the new mount API, and 2.42.4 pins legacy targets through `/proc/self/fd`; the documented legacy fallback without `/proc` remains affected.

Patch / fix

  • util-linux Debian 13 2.41.5-0+deb13u1
  • util-linux Debian 14 2.42.2-1

debian advisories DEBIAN-CVE-2026-53613

  • util-linux Ubuntu 22.04 LTS 2.37.2-4ubuntu3.6
  • util-linux Ubuntu 24.04 LTS 2.39.3-9ubuntu6.6
  • util-linux Ubuntu 26.04 LTS 2.41.3-3ubuntu2.2

ubuntu advisories UBUNTU-CVE-2026-53613

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • util-linux SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 2.41.1-160000.5.1
  • python-libmount SLES 16.0, SLES for SAP applications 16.0 2.41.1-160000.5.1
  • util-linux-systemd SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 2.41.1-160000.5.1
  • util-linux SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE Micro 5.5 +2 more 2.37.4-150500.9.32.1
  • util-linux-systemd SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE Micro 5.5 +2 more 2.37.4-150500.9.32.1
  • util-linux SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE Micro 5.4 +3 more 2.37.2-150400.8.50.1
  • util-linux-systemd SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE Micro 5.4 +3 more 2.37.2-150400.8.50.1
  • util-linux Linux Micro 6.1 2.40.4-slfo.1.1_7.1

suse advisories SUSE-SU-2026:4296-1SUSE-SU-2026:23861-1SUSE-SU-2026:23870-1SUSE-SU-2026:23884-1SUSE-SU-2026:3813-1SUSE-SU-2026:3812-1

  • util-linux openSUSE Leap 16.0 2.41.1-160000.5.1
  • python-libmount openSUSE Leap 16.0 2.41.1-160000.5.1
  • util-linux-systemd openSUSE Leap 16.0 2.41.1-160000.5.1
  • util-linux openSUSE Tumbleweed 2.42.2-1.1

opensuse advisories openSUSE-SU-2026:21905-1openSUSE-SU-2026:11408-1

  • util-linux AlmaLinux 8 2.32.1-50.el8_10
  • uuidd AlmaLinux 8 2.32.1-50.el8_10
  • libuuid AlmaLinux 8 2.32.1-50.el8_10
  • libblkid AlmaLinux 8 2.32.1-50.el8_10
  • libfdisk AlmaLinux 8 2.32.1-50.el8_10
  • libmount AlmaLinux 8 2.32.1-50.el8_10
  • libsmartcols AlmaLinux 8 2.32.1-50.el8_10
  • util-linux-user AlmaLinux 8 2.32.1-50.el8_10

almalinux advisories ALSA-2026:96212ALSA-2026:93461

  • util-linux Rocky Linux 8 2.32.1-50.el8_10
  • util-linux Rocky Linux 10 2.40.2-18.el10_2.20

rocky linux advisories RLSA-2026:96212RLSA-2026:93461

  • util-linux Alpine 3.23, Alpine 3.22 2.41.6-r0
  • util-linux Alpine 3.24 2.42.3-r0

alpine advisories ALPINE-CVE-2026-53613

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • util-linux Azure Linux 3.0 2.40.2-7

azure linux advisories AZL-108555

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Is CVE-2026-53613 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-53613 updated cvss 7.0

util-linux: TOCTOU in the mount program via ancestor directory swap on target path

  • Red Hat Enterprise Linux 7 uuidd, libuuid, libblkid, libmount, util-linux Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9 Red Hat OpenShift Container Platform 5 openshift/ose-rhel-coreos-9
    affected: workaround, no fix available
  • Red Hat OpenShift AI (RHOAI) rhoai/odh-core-bff-rhel9, rhoai/odh-dashboard-rhel9, rhoai/odh-mod-arch-maas-rhel9, rhoai/odh-mod-arch-automl-rhel9, rhoai/odh-mod-arch-gen-ai-rhel9, rhoai/odh-mod-arch-mlflow-rhel9, +6 more
    under investigation
  • Red Hat Cost Management On-Premise 1 costmanagement/costmanagement-ui-rhel10 1793825318
    fixed: vendor fix RHSA-2026:95365
  • Red Hat Enterprise Linux AppStream (v. 8) python3-libmount 2.32.1-50.el8_10
    fixed: vendor fix RHSA-2026:96212
  • Red Hat Enterprise Linux AppStream (v. 9) uuidd 2.37.4-28.el9_9, python3-libmount 2.37.4-28.el9_9
    fixed: vendor fix RHSA-2026:97522
  • Red Hat Enterprise Linux AppStream (v. 10) uuidd 2.40.2-18.el10_2.20, python3-libmount 2.40.2-18.el10_2.20
    fixed: vendor fix RHSA-2026:93461
  • Red Hat Enterprise Linux BaseOS (v. 8) uuidd 2.32.1-50.el8_10, libuuid 2.32.1-50.el8_10, libblkid 2.32.1-50.el8_10, libfdisk 2.32.1-50.el8_10, libmount 2.32.1-50.el8_10, util-linux 2.32.1-50.el8_10, +2 more
    fixed: vendor fix RHSA-2026:96212
  • Red Hat Enterprise Linux BaseOS (v. 9) libuuid 2.37.4-28.el9_9, libblkid 2.37.4-28.el9_9, libfdisk 2.37.4-28.el9_9, libmount 2.37.4-28.el9_9, util-linux 2.37.4-28.el9_9, libsmartcols 2.37.4-28.el9_9, +2 more
    fixed: vendor fix RHSA-2026:97522
show 5 more
  • Red Hat Enterprise Linux BaseOS (v. 10) libuuid 2.40.2-18.el10_2.20, libblkid 2.40.2-18.el10_2.20, libfdisk 2.40.2-18.el10_2.20, libmount 2.40.2-18.el10_2.20, util-linux 2.40.2-18.el10_2.20, libsmartcols 2.40.2-18.el10_2.20, +1 more
    fixed: vendor fix RHSA-2026:93461
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libfdisk-devel 2.37.4-28.el9_9, uuidd-debuginfo 2.37.4-28.el9_9, libuuid-debuginfo 2.37.4-28.el9_9, libblkid-debuginfo 2.37.4-28.el9_9, libfdisk-debuginfo 2.37.4-28.el9_9, libmount-debuginfo 2.37.4-28.el9_9, +7 more
    fixed: vendor fix RHSA-2026:97522
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libfdisk-devel 2.40.2-18.el10_2.20, uuidd-debuginfo 2.40.2-18.el10_2.20, libuuid-debuginfo 2.40.2-18.el10_2.20, libblkid-debuginfo 2.40.2-18.el10_2.20, libfdisk-debuginfo 2.40.2-18.el10_2.20, libmount-debuginfo 2.40.2-18.el10_2.20, +6 more
    fixed: vendor fix RHSA-2026:93461
  • Red Hat Enterprise Linux CRB (v. 8) libmount-devel 2.32.1-50.el8_10, uuidd-debuginfo 2.32.1-50.el8_10, libuuid-debuginfo 2.32.1-50.el8_10, libblkid-debuginfo 2.32.1-50.el8_10, libfdisk-debuginfo 2.32.1-50.el8_10, libmount-debuginfo 2.32.1-50.el8_10, +5 more
    fixed: vendor fix RHSA-2026:96212
  • Red Hat Hardened Images util-linux Red Hat OpenShift AI (RHOAI) rhoai/odh-mlflow-rhel9, rhoai/odh-kube-rbac-proxy-rhel9, rhoai/odh-maas-controller-rhel9, rhoai/odh-mlflow-operator-rhel9, rhoai/odh-model-controller-rhel9, rhoai/odh-ogx-k8s-operator-rhel9, +14 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
27d ago

Exploit prediction

0.16% chance of exploitation in the next 30 days, higher than 5% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CNA 3.1 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

  • util-linux util-linux

Classification

Weakness
  • CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

The maintainers of util-linux/util-linux published their own advisory on GitHub. Reviewed sources take precedence over it.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.