util-linux versions through 2.41.5 and 2.42.2 fail to check mount helper exit status before running post-mount hooks, allowing unprivileged users to execute privileged operations on pre-existing filesystems. Attackers can exploit X-mount.idmap or X-mount.owner hooks to clone filesystems with inherited suid bits or modify target inode permissions after a helper fails, achieving privilege escalation.

The Rocky Linux 10.2 host has packages installed that are affected by multiple vulnerabilities as referenced in the CIQ crlsa-2026_93461 advisory.

    * util-linux: TOCTOU in the mount program when setting up loop devices (CVE-2026-27456)

    * util-linux: util-linux: heap use-after-free in libblkid nested partition probing (CVE-2026-13595)

    * util-linux: TOCTOU in the mount program via ancestor directory swap on target path (CVE-2026-53613)

    * util-linux: util-linux: TOCTOU in the mount program when applying post-mount ownership/mode changes     (CVE-2026-53612)

    * util-linux: util-linux: SUID mount(8) allows nosuid/noexec bypass via LIBMOUNT_FORCE_MOUNT2     (CVE-2026-53614)

    * util-linux: util-linux: failed external mount helper still runs privileged X-mount post-hooks     (CVE-2026-76642)

    * util-linux: util-linux: nsenter --join-cgroup leaks root cgroup migration authority (CVE-2026-78408)

    * util-linux: util-linux: restricted bind mounts do not pin the source, allowing X-mount.owner/group/mode     redirection (CVE-2026-78410)

    * util-linux: util-linux: Partition metadata compromise via integer overflow in DOS partition parser     (CVE-2026-53615)

Tenable has extracted the preceding description block directly from the CIQ 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 RockyLinux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:93461 advisory.

    * util-linux: TOCTOU in the mount program when setting up loop devices (CVE-2026-27456)

    * util-linux: util-linux: heap use-after-free in libblkid nested partition probing (CVE-2026-13595)

    * util-linux: TOCTOU in the mount program via ancestor directory swap on target path (CVE-2026-53613)

    * util-linux: util-linux: TOCTOU in the mount program when applying post-mount ownership/mode changes     (CVE-2026-53612)

    * util-linux: util-linux: SUID mount(8) allows nosuid/noexec bypass via LIBMOUNT_FORCE_MOUNT2     (CVE-2026-53614)

    * util-linux: util-linux: failed external mount helper still runs privileged X-mount post-hooks     (CVE-2026-76642)

    * util-linux: util-linux: nsenter --join-cgroup leaks root cgroup migration authority (CVE-2026-78408)

    * util-linux: util-linux: restricted bind mounts do not pin the source, allowing X-mount.owner/group/mode     redirection (CVE-2026-78410)

    * util-linux: util-linux: Partition metadata compromise via integer overflow in DOS partition parser     (CVE-2026-53615)

Tenable has extracted the preceding description block directly from the RockyLinux 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 Oracle Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-93461 advisory.

    - libblkid: validate EBR data [CVE-2026-53615]
    - libblkid: fix use-after-free in nested partition probing [CVE-2026-13595]
    - nsenter: close cgroup.procs fd after join to prevent authority leak       [CVE-2026-78408]
    - libmount: fix SUID bypass via LIBMOUNT_FORCE_MOUNT2 and legacy mount       [CVE-2026-53614]
    - libmount: TOCTOU in the mount program via ancestor directory swap on       target path  [CVE-2026-53613]
    - libmount: TOCTOU in the mount program when applying post-mount       ownership/mode changes [CVE-2026-53612]
    - libmount: restrict the mount source for non-root users [CVE-2026-78410]
    - libmount: skip post-mount hooks after a failed mount helper       [CVE-2026-76642]

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

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

An update of the util package has been released.

The remote Redhat Enterprise Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:93461 advisory.

    The util-linux packages contain a large variety of low-level system utilities that are necessary for a     Linux system to function. Among others, these include the fdisk configuration tool and the login program.

    Security Fix(es):

    * util-linux: TOCTOU in the mount program when setting up loop devices (CVE-2026-27456)

    * util-linux: util-linux: heap use-after-free in libblkid nested partition probing (CVE-2026-13595)

    * util-linux: TOCTOU in the mount program via ancestor directory swap on target path (CVE-2026-53613)

    * util-linux: util-linux: TOCTOU in the mount program when applying post-mount ownership/mode changes     (CVE-2026-53612)

    * util-linux: util-linux: SUID mount(8) allows nosuid/noexec bypass via LIBMOUNT_FORCE_MOUNT2     (CVE-2026-53614)

    * util-linux: util-linux: failed external mount helper still runs privileged X-mount post-hooks     (CVE-2026-76642)

    * util-linux: util-linux: nsenter --join-cgroup leaks root cgroup migration authority (CVE-2026-78408)

    * util-linux: util-linux: restricted bind mounts do not pin the source, allowing X-mount.owner/group/mode     redirection (CVE-2026-78410)

    * util-linux: util-linux: Partition metadata compromise via integer overflow in DOS partition parser     (CVE-2026-53615)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux 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-b7a077a212 advisory.

    Upgrade to upstream release v2.41.6 with security-related patches.

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-2026-7f54b8305d advisory.

    Upgrade to upstream release v2.41.6 for security-related changes.

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.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - util-linux versions through 2.41.5 and 2.42.2 fail to check mount helper exit status before running post-
    mount hooks, allowing unprivileged users to execute privileged operations on pre-existing filesystems.
    Attackers can exploit X-mount.idmap or X-mount.owner hooks to clone filesystems with inherited suid bits
    or modify target inode permissions after a helper fails, achieving privilege escalation. (CVE-2026-76642)

The remote SUSE Linux SLES16 / SLES_SAP16 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:23870-1 advisory.

    - CVE-2026-13595: heap use-after-free in `libblkid` nested partition probing (bsc#1269583).
    - CVE-2026-27456: TOCTOU in the mount program when setting up loop devices (bsc#1261606).
    - CVE-2026-53612: local privilege escalation via TOCTOU in mount(8) hook_owner.c chmod/chown     (bsc#1268886).
    - CVE-2026-53613: local privilege escalation via TOCTOU in mount(8) - Target Path Redirection     (bsc#1268886).
    - CVE-2026-53614: local privilege escalation via LIBMOUNT_FORCE_MOUNT2 Environment Variable -     nosuid/noexec       Bypass in SUID mount(8) (bsc#1268886).
    - CVE-2026-76642: failed external mount helper triggers privileged `X-mount` post-hooks, which enables     local privilege       escalation (bsc#1278349).
    - CVE-2026-78408: `nsenter --join-cgroup` leaks root `cgroup` migration authority, which allows for     migration or       termination of root processes (bsc#1278348).
    - CVE-2026-78410: restricted `bind` mounts do not pin the source, which allows for     `X-mount.owner`/`group`/`mode`       redirection (bsc#1278347).

    Changes for util-linux:

    - lib/fileutils: add ul_openat_resolve() openat2 wrapper (bsc#1275441)
    - lib/fileutils: fix RESOLVE_NO_SYMLINKS fallback value
    - lib/fileutils: fix unused parameter warnings without SYS_openat2
    - libmount: add missing fileutils.h include to hook_idmap.c
    - libmount: add mnt_open_tree() helper for safe tree opening
    - libmount: pin source path with openat2() for restricted users      (bsc#1275441, bsc#1278347, CVE-2026-78410)
    - libmount: restrict source path canonicalization for non-root      users (bsc#1275441, bsc#1278347, CVE-2026-78410)
    - libmount: skip post-mount hooks after failed mount helper      (bsc#1275441, bsc#1278349, CVE-2026-76642)
    - libmount: use USE_LIBMOUNT_MOUNTFD_SUPPORT for idmap hook
    - nsenter: close cgroup.procs fd after join to prevent authority      leak (bsc#1275441, bsc#1278348, CVE-2026-78408)
    - nsenter, unshare: add O_CLOEXEC to all open() calls (bsc#1275441,      bsc#1278348, CVE-2026-78408)
    - wall, write: sanitize hostname in banner header (bsc#1275441)
    - Add missing function. (bsc#1275441)
    - ipcutils: Prevent using uninitialized variable (bsc#1268886)
    - BREAKING CHANGE:
     Paths must always be canonicalized for unprivileged users to      ensure safe target resolution. X-mount.nocanonicalize is ignored      for them.
    - INCOMAPTIBLE CHANGE (linux < 6.15):
     X-mount.subdir: The safe detached subdirectory is no more      supported for unprivileged users for safety reasons.
    - liblastlog2: Wait on busy SQLite connections (bsc#1268886).
    - libmount: Fix subvolid buffer overflow in get_btrfs_fs_root      (bsc#1268886).
    - libblkid: Fix use-after-free in nested partition probing      (bsc#1269583, bsc#1268886, CVE-2026-13595)
    - libmount: fix SUID bypass via LIBMOUNT_FORCE_MOUNT2 and legacy      mount path (bsc#1268886, CVE-2026-53614, GHSA-67r7-8m5w-22wx).
    - fileutils: add ul_open_no_symlinks() needed by other patches      (bsc#1268886).
    - libmount: add fd_target to context for TOCTOU race condition      prevention (bsc#1268886, CVE-2026-53613, GHSA-8gj5-72r3-428g).
    - libmount: ignore X-mount.nocanonicalize for restricted users
    - libmount: use fd-based fchownat/chmod in hook_owner (bsc#1268886,      CVE-2026-53612, GHSA-g8wm-75wr-g2vh).
    - libmount: restrict X-mount.subdir for non-root (bsc#1268886).
    - libmount: use fd_target in hook_idmap for move_mount()
    - libmount: add mount ID verification and man page TOCTOU note
    - loopdev: use openat2(RESOLVE_NO_SYMLINKS) for backing file      (bsc#1268886#c2, bsc#1261606).
    - Ignore pam-config error that prevents update failure if common*      pam configuration is not symlink to common-*-pc (bsc#1270219).

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 openSUSE 16 host has packages installed that are affected by multiple vulnerabilities as referenced in the openSUSE-SU-2026:21905-1 advisory.

    - CVE-2026-13595: heap use-after-free in `libblkid` nested partition probing (bsc#1269583).
    - CVE-2026-27456: TOCTOU in the mount program when setting up loop devices (bsc#1261606).
    - CVE-2026-53612: local privilege escalation via TOCTOU in mount(8) hook_owner.c chmod/chown     (bsc#1268886).
    - CVE-2026-53613: local privilege escalation via TOCTOU in mount(8) - Target Path Redirection     (bsc#1268886).
    - CVE-2026-53614: local privilege escalation via LIBMOUNT_FORCE_MOUNT2 Environment Variable -     nosuid/noexec       Bypass in SUID mount(8) (bsc#1268886).
    - CVE-2026-76642: failed external mount helper triggers privileged `X-mount` post-hooks, which enables     local privilege       escalation (bsc#1278349).
    - CVE-2026-78408: `nsenter --join-cgroup` leaks root `cgroup` migration authority, which allows for     migration or       termination of root processes (bsc#1278348).
    - CVE-2026-78410: restricted `bind` mounts do not pin the source, which allows for     `X-mount.owner`/`group`/`mode`       redirection (bsc#1278347).

    Changes for util-linux:

    - lib/fileutils: add ul_openat_resolve() openat2 wrapper (bsc#1275441)
    - lib/fileutils: fix RESOLVE_NO_SYMLINKS fallback value
    - lib/fileutils: fix unused parameter warnings without SYS_openat2
    - libmount: add missing fileutils.h include to hook_idmap.c
    - libmount: add mnt_open_tree() helper for safe tree opening
    - libmount: pin source path with openat2() for restricted users      (bsc#1275441, bsc#1278347, CVE-2026-78410)
    - libmount: restrict source path canonicalization for non-root      users (bsc#1275441, bsc#1278347, CVE-2026-78410)
    - libmount: skip post-mount hooks after failed mount helper      (bsc#1275441, bsc#1278349, CVE-2026-76642)
    - libmount: use USE_LIBMOUNT_MOUNTFD_SUPPORT for idmap hook
    - nsenter: close cgroup.procs fd after join to prevent authority      leak (bsc#1275441, bsc#1278348, CVE-2026-78408)
    - nsenter, unshare: add O_CLOEXEC to all open() calls (bsc#1275441,      bsc#1278348, CVE-2026-78408)
    - wall, write: sanitize hostname in banner header (bsc#1275441)
    - Add missing function. (bsc#1275441)
    - ipcutils: Prevent using uninitialized variable (bsc#1268886)
    - BREAKING CHANGE:
     Paths must always be canonicalized for unprivileged users to      ensure safe target resolution. X-mount.nocanonicalize is ignored      for them.
    - INCOMAPTIBLE CHANGE (linux < 6.15):
     X-mount.subdir: The safe detached subdirectory is no more      supported for unprivileged users for safety reasons.
    - liblastlog2: Wait on busy SQLite connections (bsc#1268886).
    - libmount: Fix subvolid buffer overflow in get_btrfs_fs_root      (bsc#1268886).
    - libblkid: Fix use-after-free in nested partition probing      (bsc#1269583, bsc#1268886, CVE-2026-13595)
    - libmount: fix SUID bypass via LIBMOUNT_FORCE_MOUNT2 and legacy      mount path (bsc#1268886, CVE-2026-53614, GHSA-67r7-8m5w-22wx).
    - fileutils: add ul_open_no_symlinks() needed by other patches      (bsc#1268886).
    - libmount: add fd_target to context for TOCTOU race condition      prevention (bsc#1268886, CVE-2026-53613, GHSA-8gj5-72r3-428g).
    - libmount: ignore X-mount.nocanonicalize for restricted users
    - libmount: use fd-based fchownat/chmod in hook_owner (bsc#1268886,      CVE-2026-53612, GHSA-g8wm-75wr-g2vh).
    - libmount: restrict X-mount.subdir for non-root (bsc#1268886).
    - libmount: use fd_target in hook_idmap for move_mount()
    - libmount: add mount ID verification and man page TOCTOU note
    - loopdev: use openat2(RESOLVE_NO_SYMLINKS) for backing file      (bsc#1268886#c2, bsc#1261606).
    - Ignore pam-config error that prevents update failure if common*      pam configuration is not symlink to common-*-pc (bsc#1270219).

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 version of Tencent Linux installed on the remote TencentOS Server 4 host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the TSSA-2026:0999 advisory.

    Package updates are available for TencentOS Server 4 that fix the following vulnerabilities:

    CVE-2026-76642:
    util-linux versions through 2.41.5 and 2.42.2 fail to check mount helper exit status before running post-     mount hooks, allowing unprivileged users to execute privileged operations on pre-existing filesystems.
    Attackers can exploit X-mount.idmap or X-mount.owner hooks to clone filesystems with inherited suid bits     or modify target inode permissions after a helper fails, achieving privilege escalation.

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

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

The version of util-linux installed on the remote host is prior to 2.42.3. It is, therefore, affected by multiple vulnerabilities as referenced in the SSA:2026-249-03 advisory.

    New util-linux packages are available for Slackware 15.0 and -current to fix security issues.

Tenable has extracted the preceding description block directly from the util-linux 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.

  - util-linux versions through 2.41.5 and 2.42.2 fail to check mount helper exit status before running post-     mount hooks, allowing unprivileged users to execute privileged operations on pre-existing filesystems.
    Attackers can exploit X-mount.idmap or X-mount.owner hooks to clone filesystems with inherited suid bits     or modify target inode permissions after a helper fails, achieving privilege escalation. (CVE-2026-76642)

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

ID	Name	Product	Family	Type	Severity
375819	Rocky Linux 10.2 [CIQ] Security Update: libblkid / libblkid-debuginfo / libblkid-devel / libfdisk / etc Multiple Vulnerabilities (crlsa-2026_93461)	Nessus	Rocky Linux Local Security Checks	Local	high
375445	RockyLinux 10 : util-linux (RLSA-2026:93461)	Nessus	Rocky Linux Local Security Checks	Local	high
375176	Oracle Linux 10 : util-linux (ELSA-2026-93461)	Nessus	Oracle Linux Local Security Checks	Local	high
375063	Photon OS 5.0: Util PHSA-2026-5.0-91-0999	Nessus	PhotonOS Local Security Checks	Local	high
374940	RHEL 10 : util-linux (RHSA-2026:93461)	Nessus	Red Hat Local Security Checks	Local	high
372906	Fedora 43 : util-linux (2026-b7a077a212)	Nessus	Fedora Local Security Checks	Local	high
372892	Fedora 44 : util-linux (2026-7f54b8305d)	Nessus	Fedora Local Security Checks	Local	high
459544	Echo: util-linux: security update to 2.41.5-0+deb13u1+e2	Tenable Cloud Security	Echo Local Security Checks	Local	high
459544	Echo: util-linux: security update to 2.41.5-0+deb13u1+e2	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	high
350831	SUSE SLES16: lastlog2 / libblkid-devel / libblkid-devel-static / libblkid1 / etc (SUSE-SU-2026:23870-1)	Nessus	SuSE Local Security Checks	Local	high
350149	openSUSE 16: lastlog2 / libblkid-devel / libblkid-devel-static / libblkid1 / etc (openSUSE-SU-2026:21905-1)	Nessus	SuSE Local Security Checks	Local	high
345717	TencentOS Server 4: util-linux (TSSA-2026:0999)	Nessus	Tencent Local Security Checks	Local	high
343408	Slackware Linux 15.0 / current util-linux Multiple Vulnerabilities (SSA:2026-249-03)	Nessus	Slackware Local Security Checks	Local	high
342409	Linux Distros Unpatched Vulnerability : CVE-2026-76642	Nessus	Misc.	Local	high

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