Red Hat Enterprise Linux - util-linux: util-linux: TOCTOU in the mount program when applying post-mount ownership/mode changes

Ubuntu Linux - [Local Privilege Escalation via TOCTOU in mount(8) hook_owner.c chmod/chown]

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:3684-1 advisory.

    - CVE-2026-13595: heap use-after-free read in `libblkid` nested partition probing (bsc#1269583).
    - CVE-2026-27456: TOCTOU race condition in the mount program when setting up loop devices (bsc#1261606).
    - Several security issues in releases prior to v2.42.2 and v2.41.5 (bsc#1268886).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:3685-1 advisory.

    - CVE-2026-13595: heap use-after-free read in `libblkid` nested partition probing (bsc#1269583).
    - CVE-2026-27456: TOCTOU race condition in the mount program when setting up loop devices (bsc#1261606).
    - Several security issues in releases prior to v2.42.2 and v2.41.5 (bsc#1268886).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Debian 13 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-6442 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-6442-1                   security@debian.org     https://www.debian.org/security/                     Salvatore Bonaccorso     August 14, 2026                       https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : util-linux     CVE ID         : CVE-2026-13595 CVE-2026-27456 CVE-2026-53612 CVE-2026-53613                      CVE-2026-53614     Debian Bug     : 1140194 1140195 1140196

    Several vulnerabilities were discovered in util-linux which could result     in privilege escalation.

    For the stable distribution (trixie), these problems have been fixed in     version 2.41.5-0+deb13u1.

    We recommend that you upgrade your util-linux packages.

    For the detailed security status of util-linux please refer to its     security tracker page at:
    https://security-tracker.debian.org/tracker/util-linux

    Further information about Debian Security Advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://www.debian.org/security/

    Mailing list: debian-security-announce@lists.debian.org

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-a7ff7017ee advisory.

    upstream upgrade with security fixes:

      - CVE-2026-53612 - libmount: TOCTOU attack via ancestor directory swap during mount
      - CVE-2026-53613 - libmount: SUID bypass via LIBMOUNT_FORCE_MOUNT2 and legacy mount path
      - CVE-2026-53614 - libmount: fd_target TOCTOU prevention


Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 44 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-c70cb96ff1 advisory.

    upstream upgrade with security fixes:

      - CVE-2026-53612 - libmount: TOCTOU attack via ancestor directory swap during mount
      - CVE-2026-53613 - libmount: SUID bypass via LIBMOUNT_FORCE_MOUNT2 and legacy mount path
      - CVE-2026-53614 - libmount: fd_target TOCTOU prevention


Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - upstream upgrade with security fixes:    - CVE-2026-53612 - libmount: TOCTOU attack via ancestor directory     swap during mount   - CVE-2026-53613 - libmount: SUID bypass via LIBMOUNT_FORCE_MOUNT2 and legacy mount     path   - CVE-2026-53614 - libmount: fd_target TOCTOU prevention  (CVE-2026-53612)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
339736	SUSE SLED15: libblkid-devel / libblkid-devel-static / libblkid1 / etc (SUSE-SU-2026:3684-1)	Nessus	SuSE Local Security Checks	Local	medium
339726	SUSE SLES15: libblkid-devel / libblkid-devel-static / libblkid1 / etc (SUSE-SU-2026:3685-1)	Nessus	SuSE Local Security Checks	Local	medium
335429	Debian dsa-6442 : bsdextrautils - security update	Nessus	Debian Local Security Checks	Local	medium
323123	Fedora 43 : util-linux (2026-a7ff7017ee)	Nessus	Fedora Local Security Checks	Local	high
321735	Fedora 44 : util-linux (2026-c70cb96ff1)	Nessus	Fedora Local Security Checks	Local	high
321413	Linux Distros Unpatched Vulnerability : CVE-2026-53612	Nessus	Misc.	Local	high

Detections

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CVE-2026-53612

critical

Tenable Plugins

medium

medium

medium

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high

high