CVE-2026-76642
util-linux libmount Privilege Escalation via Failed Mount Helper
CVE-2026-76642 is fixed in 32 products on 1 platform, first by RHSA-2026:93461, released September 2, 2026. It is not reported as exploited. Patch Radar priority: High.
High
CVSS
8.0
Moderate
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0022
12th percentile
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| libblkid · Fedora 43 | 2.41.6-1.fc43 | FEDORA-2026-B7A077A212 | Nov 7, 2026 |
| libblkid · almalinux 10 | 2.40.2-18.el10_2.20 | ALSA-2026:93461 | Nov 7, 2026 |
| libblkid · ol 10 | 0:2.40.2-18.0.1.el10_2.20 | ELSA-2026-93461 | Nov 7, 2026 |
| libblkid-debuginfo · Fedora 43 | 2.41.6-1.fc43 | FEDORA-2026-B7A077A212 | Nov 7, 2026 |
| libblkid-devel · Fedora 43 | 2.41.6-1.fc43 | FEDORA-2026-B7A077A212 | Nov 7, 2026 |
| libblkid-devel · almalinux 10 | 2.40.2-18.el10_2.20 | ALSA-2026:93461 | Nov 7, 2026 |
| libblkid-devel · ol 10 | 0:2.40.2-18.0.1.el10_2.20 | ELSA-2026-93461 | Nov 7, 2026 |
| libfdisk · Fedora 43 | 2.41.6-1.fc43 | FEDORA-2026-B7A077A212 | Nov 7, 2026 |
| libfdisk · almalinux 10 | 2.40.2-18.el10_2.20 | ALSA-2026:93461 | Nov 7, 2026 |
| libfdisk · ol 10 | 0:2.40.2-18.0.1.el10_2.20 | ELSA-2026-93461 | Nov 7, 2026 |
| libfdisk-debuginfo · Fedora 43 | 2.41.6-1.fc43 | FEDORA-2026-B7A077A212 | Nov 7, 2026 |
| libfdisk-devel · Fedora 43 | 2.41.6-1.fc43 | FEDORA-2026-B7A077A212 | Nov 7, 2026 |
| libfdisk-devel · almalinux 10 | 2.40.2-18.el10_2.20 | ALSA-2026:93461 | Nov 7, 2026 |
| libfdisk-devel · ol 10 | 0:2.40.2-18.0.1.el10_2.20 | ELSA-2026-93461 | Nov 7, 2026 |
| liblastlog2 · Fedora 43 | 2.41.6-1.fc43 | FEDORA-2026-B7A077A212 | Nov 7, 2026 |
| liblastlog2-debuginfo · Fedora 43 | 2.41.6-1.fc43 | FEDORA-2026-B7A077A212 | Nov 7, 2026 |
| liblastlog2-devel · Fedora 43 | 2.41.6-1.fc43 | FEDORA-2026-B7A077A212 | Nov 7, 2026 |
| libmount · Fedora 43 | 2.41.6-1.fc43 | FEDORA-2026-B7A077A212 | Nov 7, 2026 |
| libmount · almalinux 10 | 2.40.2-18.el10_2.20 | ALSA-2026:93461 | Nov 7, 2026 |
| libmount · ol 10 | 0:2.40.2-18.0.1.el10_2.20 | ELSA-2026-93461 | Nov 7, 2026 |
| libmount-debuginfo · Fedora 43 | 2.41.6-1.fc43 | FEDORA-2026-B7A077A212 | Nov 7, 2026 |
| libmount-devel · Fedora 43 | 2.41.6-1.fc43 | FEDORA-2026-B7A077A212 | Nov 7, 2026 |
| libmount-devel · almalinux 10 | 2.40.2-18.el10_2.20 | ALSA-2026:93461 | Nov 7, 2026 |
| libmount-devel · ol 10 | 0:2.40.2-18.0.1.el10_2.20 | ELSA-2026-93461 | Nov 7, 2026 |
| libsmartcols · Fedora 43 | 2.41.6-1.fc43 | FEDORA-2026-B7A077A212 | Nov 7, 2026 |
| libsmartcols · almalinux 10 | 2.40.2-18.el10_2.20 | ALSA-2026:93461 | Nov 7, 2026 |
| libsmartcols · ol 10 | 0:2.40.2-18.0.1.el10_2.20 | ELSA-2026-93461 | Nov 7, 2026 |
| libsmartcols-debuginfo · Fedora 43 | 2.41.6-1.fc43 | FEDORA-2026-B7A077A212 | Nov 7, 2026 |
| libsmartcols-devel · Fedora 43 | 2.41.6-1.fc43 | FEDORA-2026-B7A077A212 | Nov 7, 2026 |
| libsmartcols-devel · almalinux 10 | 2.40.2-18.el10_2.20 | ALSA-2026:93461 | Nov 7, 2026 |
| libsmartcols-devel · ol 10 | 0:2.40.2-18.0.1.el10_2.20 | ELSA-2026-93461 | Nov 7, 2026 |
| libuuid · Fedora 43 | 2.41.6-1.fc43 | FEDORA-2026-B7A077A212 | Nov 7, 2026 |
| libuuid · almalinux 10 | 2.40.2-18.el10_2.20 | ALSA-2026:93461 | Nov 7, 2026 |
| libuuid · ol 10 | 0:2.40.2-18.0.1.el10_2.20 | ELSA-2026-93461 | Nov 7, 2026 |
| libuuid-debuginfo · Fedora 43 | 2.41.6-1.fc43 | FEDORA-2026-B7A077A212 | Nov 7, 2026 |
| libuuid-devel · Fedora 43 | 2.41.6-1.fc43 | FEDORA-2026-B7A077A212 | Nov 7, 2026 |
| libuuid-devel · almalinux 10 | 2.40.2-18.el10_2.20 | ALSA-2026:93461 | Nov 7, 2026 |
| libuuid-devel · ol 10 | 0:2.40.2-18.0.1.el10_2.20 | ELSA-2026-93461 | Nov 7, 2026 |
| python-libmount · opensuse-leap 16.0 | 2.41.1-160000.5.1 | OPENSUSE-SU-2026:21905-1 | Sep 22, 2026 |
| python-libmount · sles 16.0 | 2.41.1-160000.5.1 | SUSE-SU-2026:23870-1 | Sep 22, 2026 |
| python3-libmount · Fedora 43 | 2.41.6-1.fc43 | FEDORA-2026-B7A077A212 | Nov 7, 2026 |
| python3-libmount · almalinux 10 | 2.40.2-18.el10_2.20 | ALSA-2026:93461 | Nov 7, 2026 |
| python3-libmount · ol 10 | 0:2.40.2-18.0.1.el10_2.20 | ELSA-2026-93461 | Nov 7, 2026 |
| python3-libmount-debuginfo · Fedora 43 | 2.41.6-1.fc43 | FEDORA-2026-B7A077A212 | Nov 7, 2026 |
| util-linux · Debian 14 | 2.42.3-1 | DEBIAN-CVE-2026-76642 | Sep 17, 2026 |
| util-linux · Fedora 43 | 2.41.6-1.fc43 | FEDORA-2026-B7A077A212 | Nov 7, 2026 |
| util-linux · RHEL 10 | 2.40.2-18.el10_2.20 | RHSA-2026:93461 | Sep 2, 2026 |
| util-linux · almalinux 10 | 2.40.2-18.el10_2.20 | ALSA-2026:93461 | Nov 7, 2026 |
| util-linux · ol 10 | 0:2.40.2-18.0.1.el10_2.20 | ELSA-2026-93461 | Nov 7, 2026 |
| util-linux · opensuse-leap 16.0 | 2.41.1-160000.5.1 | OPENSUSE-SU-2026:21905-1 | Sep 22, 2026 |
| util-linux · rocky 10 | 0:2.40.2-18.el10_2.20 | RLSA-2026:93461 | Nov 7, 2026 |
| util-linux · sles 16.0 | 2.41.1-160000.5.1 | SUSE-SU-2026:23870-1 | Sep 22, 2026 |
| util-linux-core · Fedora 43 | 2.41.6-1.fc43 | FEDORA-2026-B7A077A212 | Nov 7, 2026 |
| util-linux-core · almalinux 10 | 2.40.2-18.el10_2.20 | ALSA-2026:93461 | Nov 7, 2026 |
| util-linux-core · ol 10 | 0:2.40.2-18.0.1.el10_2.20 | ELSA-2026-93461 | Nov 7, 2026 |
| util-linux-core-debuginfo · Fedora 43 | 2.41.6-1.fc43 | FEDORA-2026-B7A077A212 | Nov 7, 2026 |
| util-linux-debuginfo · Fedora 43 | 2.41.6-1.fc43 | FEDORA-2026-B7A077A212 | Nov 7, 2026 |
| util-linux-debugsource · Fedora 43 | 2.41.6-1.fc43 | FEDORA-2026-B7A077A212 | Nov 7, 2026 |
| util-linux-i18n · Fedora 43 | 2.41.6-1.fc43 | FEDORA-2026-B7A077A212 | Nov 7, 2026 |
| util-linux-script · Fedora 43 | 2.41.6-1.fc43 | FEDORA-2026-B7A077A212 | Nov 7, 2026 |
| util-linux-script-debuginfo · Fedora 43 | 2.41.6-1.fc43 | FEDORA-2026-B7A077A212 | Nov 7, 2026 |
| util-linux-systemd · opensuse-leap 16.0 | 2.41.1-160000.5.1 | OPENSUSE-SU-2026:21905-1 | Sep 22, 2026 |
| util-linux-systemd · sles 16.0 | 2.41.1-160000.5.1 | SUSE-SU-2026:23870-1 | Sep 22, 2026 |
| uuidd · Fedora 43 | 2.41.6-1.fc43 | FEDORA-2026-B7A077A212 | Nov 7, 2026 |
| uuidd · almalinux 10 | 2.40.2-18.el10_2.20 | ALSA-2026:93461 | Nov 7, 2026 |
| uuidd · ol 10 | 0:2.40.2-18.0.1.el10_2.20 | ELSA-2026-93461 | Nov 7, 2026 |
| uuidd-debuginfo · Fedora 43 | 2.41.6-1.fc43 | FEDORA-2026-B7A077A212 | Nov 7, 2026 |
Patch Radar data is free to use with attribution. Terms and how to credit it.
Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.