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Fencer Intel
high 8.0

CVE-2026-53615 json

util-linux libblkid DOS extended-partition overflow produces invalid partition metadata

published 4mo ago modified 26d ago also EUVD-2026-101292 , GHSA-h4rw-gv36-wmp5

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
8.0
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 7%
public exploits
0
none known

Summary

util-linux is a random collection of Linux utilities. Before util-linux 2.41.4, `parse_dos_extended()` in `libblkid/src/partitions/dos.c` computes an extended-partition start sector with 32-bit addition and does not apply the extended-area bounds checks to the first two EBR entries. A local attacker who causes a crafted DOS extended-partition disk image or removable medium to be probed can wrap `cur_start + start` to sector zero and cause libblkid to report a false partition overlapping the MBR. This directly compromises the integrity of the reported partition metadata; disk modification or availability loss requires a separate downstream consumer to act on that metadata. This issue is fixed in 2.41.4.

Patch / fix

  • kernel util-linux 2.41.4
  • util-linux Debian 13 2.41.5-0+deb13u1
  • util-linux Debian 14 2.42-1

debian advisories DEBIAN-CVE-2026-53615

  • 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-2026-53615

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 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 Azure Linux 3.0 2.40.2-7

azure linux advisories AZL-108198

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-2026-53615 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.

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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-2026-53615 updated cvss 8.0

util-linux: util-linux: Partition metadata compromise via integer overflow in DOS partition parser

  • Red Hat Enterprise Linux 7 uuidd, libuuid, libblkid, libmount, util-linux Red Hat Hardened Images util-linux Red Hat OpenShift Container Platform 4 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_9.1, python3-libmount 2.37.4-28.el9_9.1
    fixed: vendor fix RHSA-2026:98519
  • Red Hat Enterprise Linux AppStream (v. 10) uuidd 2.40.2-18.el10_2.20, uuidd 2.40.2-24.el10_3.24, python3-libmount 2.40.2-18.el10_2.20, python3-libmount 2.40.2-24.el10_3.24
    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_9.1, libblkid 2.37.4-28.el9_9.1, libfdisk 2.37.4-28.el9_9.1, libmount 2.37.4-28.el9_9.1, util-linux 2.37.4-28.el9_9.1, libsmartcols 2.37.4-28.el9_9.1, +2 more
    fixed: vendor fix RHSA-2026:98519
show 5 more
  • Red Hat Enterprise Linux BaseOS (v. 10) libuuid 2.40.2-18.el10_2.20, libuuid 2.40.2-24.el10_3.24, libblkid 2.40.2-18.el10_2.20, libblkid 2.40.2-24.el10_3.24, libfdisk 2.40.2-18.el10_2.20, libfdisk 2.40.2-24.el10_3.24, +8 more
    fixed: vendor fix RHSA-2026:93461
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libfdisk-devel 2.37.4-28.el9_9.1, uuidd-debuginfo 2.37.4-28.el9_9.1, libuuid-debuginfo 2.37.4-28.el9_9.1, libblkid-debuginfo 2.37.4-28.el9_9.1, libfdisk-debuginfo 2.37.4-28.el9_9.1, libmount-debuginfo 2.37.4-28.el9_9.1, +7 more
    fixed: vendor fix RHSA-2026:98519
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libfdisk-devel 2.40.2-18.el10_2.20, libfdisk-devel 2.40.2-24.el10_3.24, uuidd-debuginfo 2.40.2-18.el10_2.20, uuidd-debuginfo 2.40.2-24.el10_3.24, libuuid-debuginfo 2.40.2-18.el10_2.20, libuuid-debuginfo 2.40.2-24.el10_3.24, +18 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 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
partial
Assessed
28d ago

Exploit prediction

0.18% chance of exploitation in the next 30 days, higher than 7% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CNA 3.1 8.0 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H

Affected products

  • util-linux util-linux

Classification

Weakness
  • CWE-190 Integer Overflow or Wraparound

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.