OESA-2026-3981

See a problem?
Please try reporting it to the source first.

Source

https://www.openeuler.org/en/security/security-bulletins/detail/?id=openEuler-SA-2026-3981

Import Source

https://repo.openeuler.org/security/data/osv/OESA-2026-3981.json

JSON Data

https://api.osv.dev/v1/vulns/OESA-2026-3981

Upstream

CVE (5)

CVE-2026-53612
CVE-2026-53613
CVE-2026-53614
CVE-2026-76642
CVE-2026-78410

Published

2026-09-20T13:23:47Z

Modified

2026-09-20T13:30:28Z

Severity

7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator

Summary

util-linux security update

Details

The util-linux package contains a random collection of files that implements some low-level basic linux utilities.

Security Fix(es):

CVE-2026-53612 has no publicly disclosed vulnerability details yet. It is only indexed by the Snyk data source. Details are pending disclosure.(CVE-2026-53612)

When an /etc/fstab entry is configured with the user or users option, mount(8) validates the target path before performing the mount syscall, creating a Time-of-Check-Time-of-Use (TOCTOU) window. A local unprivileged user with write access to an ancestor directory of the mount target can swap that directory to redirect the mount to an arbitrary root-owned location, potentially escalating privileges to root.(CVE-2026-53613)

A flaw was found in util-linux. The mount(8) SUID binary does not sanitize the LIBMOUNT_FORCE_MOUNT2 environment variable before use. A local unprivileged user can set this variable to force mount(8) to use the legacy two-step mount(2) code path, which applies security restrictions such as nosuid and noexec after the mount is already active. During this window, an attacker can execute a SUID binary from the mounted filesystem, allowing local privilege escalation to root. Affected versions: util-linux v2.39.1 through v2.43-devel (current master).(CVE-2026-53614)

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)

A flaw was found in util-linux. Restricted bind mounts take the source path from fstab but do not pin that source before the privileged mount. A local unprivileged user who can replace the authorized source or a writable ancestor can redirect SUID mount(8) to bind another host directory. If the fstab entry also sets X-mount.owner, X-mount.group, or X-mount.mode, root then changes ownership or mode on that redirected inode.(CVE-2026-78410)

Database specific

{
    "severity":  "High"
}

References

Affected packages

openEuler:24.03-LTS-SP3 / util-linux

Package

Name: util-linux
Purl: pkg:rpm/openEuler/util-linux&distro=openEuler-24.03-LTS-SP3

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

2.39.1-44.oe2403sp3

Ecosystem specific

{
    "aarch64":  [
        "libblkid-2.39.1-44.oe2403sp3.aarch64.rpm",
        "libfdisk-2.39.1-44.oe2403sp3.aarch64.rpm",
        "libmount-2.39.1-44.oe2403sp3.aarch64.rpm",
        "libsmartcols-2.39.1-44.oe2403sp3.aarch64.rpm",
        "libuuid-2.39.1-44.oe2403sp3.aarch64.rpm",
        "python3-libmount-2.39.1-44.oe2403sp3.aarch64.rpm",
        "util-linux-2.39.1-44.oe2403sp3.aarch64.rpm",
        "util-linux-debuginfo-2.39.1-44.oe2403sp3.aarch64.rpm",
        "util-linux-debugsource-2.39.1-44.oe2403sp3.aarch64.rpm",
        "util-linux-devel-2.39.1-44.oe2403sp3.aarch64.rpm",
        "util-linux-user-2.39.1-44.oe2403sp3.aarch64.rpm",
        "uuidd-2.39.1-44.oe2403sp3.aarch64.rpm"
    ],
    "noarch":  [
        "util-linux-help-2.39.1-44.oe2403sp3.noarch.rpm"
    ],
    "src":  [
        "util-linux-2.39.1-44.oe2403sp3.src.rpm"
    ],
    "x86_64":  [
        "libblkid-2.39.1-44.oe2403sp3.x86_64.rpm",
        "libfdisk-2.39.1-44.oe2403sp3.x86_64.rpm",
        "libmount-2.39.1-44.oe2403sp3.x86_64.rpm",
        "libsmartcols-2.39.1-44.oe2403sp3.x86_64.rpm",
        "libuuid-2.39.1-44.oe2403sp3.x86_64.rpm",
        "python3-libmount-2.39.1-44.oe2403sp3.x86_64.rpm",
        "util-linux-2.39.1-44.oe2403sp3.x86_64.rpm",
        "util-linux-debuginfo-2.39.1-44.oe2403sp3.x86_64.rpm",
        "util-linux-debugsource-2.39.1-44.oe2403sp3.x86_64.rpm",
        "util-linux-devel-2.39.1-44.oe2403sp3.x86_64.rpm",
        "util-linux-user-2.39.1-44.oe2403sp3.x86_64.rpm",
        "uuidd-2.39.1-44.oe2403sp3.x86_64.rpm"
    ]
}

Database specific

source

"https://repo.openeuler.org/security/data/osv/OESA-2026-3981.json"