# CVE-2026-78410: Util-linux: util-linux: restricted bind mounts do not pin the source, allowing x-mount.owner/group/mode redirection CVE-2026-78410 is fixed in 16 products on 1 platform, first by RHSA-2026:93461, released September 2, 2026. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2026-78410 - Priority: High - CVSS: 8.0 (Important) - EPSS: 0.0020 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Sep 2, 2026 - Weakness: Time-of-check Time-of-use (TOCTOU) Race Condition - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78410 ## Description 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. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | libblkid almalinux 10 | 2.40.2-18.el10_2.20 | [ALSA-2026:93461](https://patchblox.com/security/data/fix/linux/alsa-2026-93461.md) | Nov 7, 2026 | | Linux | libblkid ol 10 | 0:2.40.2-18.0.1.el10_2.20 | [ELSA-2026-93461](https://patchblox.com/security/data/fix/linux/elsa-2026-93461.md) | Nov 7, 2026 | | Linux | libblkid-devel almalinux 10 | 2.40.2-18.el10_2.20 | [ALSA-2026:93461](https://patchblox.com/security/data/fix/linux/alsa-2026-93461.md) | Nov 7, 2026 | | Linux | libblkid-devel ol 10 | 0:2.40.2-18.0.1.el10_2.20 | [ELSA-2026-93461](https://patchblox.com/security/data/fix/linux/elsa-2026-93461.md) | Nov 7, 2026 | | Linux | libfdisk almalinux 10 | 2.40.2-18.el10_2.20 | [ALSA-2026:93461](https://patchblox.com/security/data/fix/linux/alsa-2026-93461.md) | Nov 7, 2026 | | Linux | libfdisk ol 10 | 0:2.40.2-18.0.1.el10_2.20 | [ELSA-2026-93461](https://patchblox.com/security/data/fix/linux/elsa-2026-93461.md) | Nov 7, 2026 | | Linux | libfdisk-devel almalinux 10 | 2.40.2-18.el10_2.20 | [ALSA-2026:93461](https://patchblox.com/security/data/fix/linux/alsa-2026-93461.md) | Nov 7, 2026 | | Linux | libfdisk-devel ol 10 | 0:2.40.2-18.0.1.el10_2.20 | [ELSA-2026-93461](https://patchblox.com/security/data/fix/linux/elsa-2026-93461.md) | Nov 7, 2026 | | Linux | libmount almalinux 10 | 2.40.2-18.el10_2.20 | [ALSA-2026:93461](https://patchblox.com/security/data/fix/linux/alsa-2026-93461.md) | Nov 7, 2026 | | Linux | libmount ol 10 | 0:2.40.2-18.0.1.el10_2.20 | [ELSA-2026-93461](https://patchblox.com/security/data/fix/linux/elsa-2026-93461.md) | Nov 7, 2026 | | Linux | libmount-devel almalinux 10 | 2.40.2-18.el10_2.20 | [ALSA-2026:93461](https://patchblox.com/security/data/fix/linux/alsa-2026-93461.md) | Nov 7, 2026 | | Linux | libmount-devel ol 10 | 0:2.40.2-18.0.1.el10_2.20 | [ELSA-2026-93461](https://patchblox.com/security/data/fix/linux/elsa-2026-93461.md) | Nov 7, 2026 | | Linux | libsmartcols almalinux 10 | 2.40.2-18.el10_2.20 | [ALSA-2026:93461](https://patchblox.com/security/data/fix/linux/alsa-2026-93461.md) | Nov 7, 2026 | | Linux | libsmartcols ol 10 | 0:2.40.2-18.0.1.el10_2.20 | [ELSA-2026-93461](https://patchblox.com/security/data/fix/linux/elsa-2026-93461.md) | Nov 7, 2026 | | Linux | libsmartcols-devel almalinux 10 | 2.40.2-18.el10_2.20 | [ALSA-2026:93461](https://patchblox.com/security/data/fix/linux/alsa-2026-93461.md) | Nov 7, 2026 | | Linux | libsmartcols-devel ol 10 | 0:2.40.2-18.0.1.el10_2.20 | [ELSA-2026-93461](https://patchblox.com/security/data/fix/linux/elsa-2026-93461.md) | Nov 7, 2026 | | Linux | libuuid almalinux 10 | 2.40.2-18.el10_2.20 | [ALSA-2026:93461](https://patchblox.com/security/data/fix/linux/alsa-2026-93461.md) | Nov 7, 2026 | | Linux | libuuid ol 10 | 0:2.40.2-18.0.1.el10_2.20 | [ELSA-2026-93461](https://patchblox.com/security/data/fix/linux/elsa-2026-93461.md) | Nov 7, 2026 | | Linux | libuuid-devel almalinux 10 | 2.40.2-18.el10_2.20 | [ALSA-2026:93461](https://patchblox.com/security/data/fix/linux/alsa-2026-93461.md) | Nov 7, 2026 | | Linux | libuuid-devel ol 10 | 0:2.40.2-18.0.1.el10_2.20 | [ELSA-2026-93461](https://patchblox.com/security/data/fix/linux/elsa-2026-93461.md) | Nov 7, 2026 | | Linux | python-libmount opensuse-leap 16.0 | 2.41.1-160000.5.1 | [OPENSUSE-SU-2026:21905-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21905-1.md) | Sep 22, 2026 | | Linux | python-libmount sles 16.0 | 2.41.1-160000.5.1 | [SUSE-SU-2026:23870-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23870-1.md) | Sep 22, 2026 | | Linux | python3-libmount almalinux 10 | 2.40.2-18.el10_2.20 | [ALSA-2026:93461](https://patchblox.com/security/data/fix/linux/alsa-2026-93461.md) | Nov 7, 2026 | | Linux | python3-libmount ol 10 | 0:2.40.2-18.0.1.el10_2.20 | [ELSA-2026-93461](https://patchblox.com/security/data/fix/linux/elsa-2026-93461.md) | Nov 7, 2026 | | Linux | util-linux Debian 14 | 2.42.3-1 | [DEBIAN-CVE-2026-78410](https://patchblox.com/security/data/fix/linux/debian-cve-2026-78410.md) | Sep 17, 2026 | | Linux | util-linux RHEL 10 | 2.40.2-18.el10_2.20 | [RHSA-2026:93461](https://patchblox.com/security/data/fix/linux/rhsa-2026-93461.md) | Sep 2, 2026 | | Linux | util-linux almalinux 10 | 2.40.2-18.el10_2.20 | [ALSA-2026:93461](https://patchblox.com/security/data/fix/linux/alsa-2026-93461.md) | Nov 7, 2026 | | Linux | util-linux ol 10 | 0:2.40.2-18.0.1.el10_2.20 | [ELSA-2026-93461](https://patchblox.com/security/data/fix/linux/elsa-2026-93461.md) | Nov 7, 2026 | | Linux | util-linux opensuse-leap 16.0 | 2.41.1-160000.5.1 | [OPENSUSE-SU-2026:21905-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21905-1.md) | Sep 22, 2026 | | Linux | util-linux rocky 10 | 0:2.40.2-18.el10_2.20 | [RLSA-2026:93461](https://patchblox.com/security/data/fix/linux/rlsa-2026-93461.md) | Nov 7, 2026 | | Linux | util-linux sles 16.0 | 2.41.1-160000.5.1 | [SUSE-SU-2026:23870-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23870-1.md) | Sep 22, 2026 | | Linux | util-linux-core almalinux 10 | 2.40.2-18.el10_2.20 | [ALSA-2026:93461](https://patchblox.com/security/data/fix/linux/alsa-2026-93461.md) | Nov 7, 2026 | | Linux | util-linux-core ol 10 | 0:2.40.2-18.0.1.el10_2.20 | [ELSA-2026-93461](https://patchblox.com/security/data/fix/linux/elsa-2026-93461.md) | Nov 7, 2026 | | Linux | util-linux-systemd opensuse-leap 16.0 | 2.41.1-160000.5.1 | [OPENSUSE-SU-2026:21905-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21905-1.md) | Sep 22, 2026 | | Linux | util-linux-systemd sles 16.0 | 2.41.1-160000.5.1 | [SUSE-SU-2026:23870-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23870-1.md) | Sep 22, 2026 | | Linux | uuidd almalinux 10 | 2.40.2-18.el10_2.20 | [ALSA-2026:93461](https://patchblox.com/security/data/fix/linux/alsa-2026-93461.md) | Nov 7, 2026 | | Linux | uuidd ol 10 | 0:2.40.2-18.0.1.el10_2.20 | [ELSA-2026-93461](https://patchblox.com/security/data/fix/linux/elsa-2026-93461.md) | Nov 7, 2026 | --- Data as of 2026-11-09T13:31:49Z UTC. 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