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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | — | — |
| Red Hat | Red Hat Cost Management On-Premise 1 | — | — |
| Red Hat | Red Hat Hardened Images | — | — |
| Red Hat | Red Hat Enterprise Linux 7 | — | — |
| Red Hat | Red Hat Enterprise Linux 8 | — | — |
| Red Hat | Red Hat Enterprise Linux 9 | — | — |
| Red Hat | Red Hat OpenShift Container Platform 4 | — | — |
| Red Hat | Red Hat OpenShift Container Platform 5 | — | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | util-linux | 2.42.3-1 | — |
| Debian 13 | util-linux | No fix yet | — |
| Debian 12 | util-linux | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | util-linux | No fix yet | — |
| Ubuntu 26.04 LTS | util-linux | No fix yet | — |
| Ubuntu 24.04 LTS | util-linux | No fix yet | — |
| Ubuntu 18.04 LTS | util-linux | No fix yet | — |
| Ubuntu 14.04 LTS | util-linux | No fix yet | — |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | util-linux | No fix yet | — |
| Ubuntu Pro 16.04 LTS | util-linux | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | uuidd +13 | 2.40.2-18.el10_2.20 | RHSA-2026:93461 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Hardened Images 1 | uuidd +17 | 2.42.2-3.4.hum1 | RHSA-2026:63162 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | uuidd +13 | 2.40.2-18.el10_2.20 | ALSA-2026:93461 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | util-linux | 2.40.2-18.el10_2.20 | RLSA-2026:93461 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | util-linux +2 | 2.41.1-160000.5.1 | SUSE-SU-2026:23870-1, SUSE-SU-2026:23861-1 |
| SLES 16.0 | util-linux +2 | 2.41.1-160000.5.1 | SUSE-SU-2026:23870-1, SUSE-SU-2026:23861-1 |
| SLE Micro 6.2 | util-linux +1 | 2.41.1-160000.5.1 | SUSE-SU-2026:23884-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | util-linux | 2.42.3-1.1 | openSUSE-SU-2026:11870-1 |
| openSUSE Leap 16.0 | util-linux +2 | 2.41.1-160000.5.1 | openSUSE-SU-2026:21905-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | util-linux | 2.42.3-r0 | — |
| Alpine v3.23 | util-linux | 2.41.6-r0 | — |
| Alpine v3.22 | util-linux | 2.41.6-r0 | — |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | util-linux | 2.40.2-6 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | uuidd +13 | 2.40.2-18.0.1.el10_2.20 | ELSA-2026-93461 |
Advisories 11
- RHSA-2026:93461 Red Hat Security Advisory: util-linux security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- WID-SEC-2026-3160 util-linux: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 4, 2026
- RLSA-2026:93461 Important: util-linux security update Rocky Linux Security Advisories · Nov 3, 2026
- ALSA-2026:93461 Important: util-linux security update AlmaLinux Security Advisories · Nov 2, 2026
- ELSA-2026-93461 Important: util-linux security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Nov 2, 2026
- RHSA-2026:63162 Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- SUSE-SU-2026:23884-1 Security update for util-linux SUSE / openSUSE Security Updates · Sep 30, 2026
- SUSE-SU-2026:23870-1 Security update for util-linux SUSE / openSUSE Security Updates · Sep 27, 2026
- SUSE-SU-2026:23861-1 Security update for util-linux SUSE / openSUSE Security Updates · Sep 27, 2026
- openSUSE-SU-2026:21905-1 Security update for util-linux SUSE / openSUSE Security Updates · Sep 25, 2026
- openSUSE-SU-2026:11870-1 libblkid-devel-2.42.3-1.1 on GA media SUSE / openSUSE Security Updates · Sep 24, 2026
References
- RHSA-2026:63162 vendor-advisory
- RHSA-2026:93461 vendor-advisory
- RHSA-2026:95365 vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-78410 vdb-entry
- RHBZ#2522684 issue-tracking
- https://github.com/util-linux/util-linux/security/advisories/GHSA-rh77-686x-2f2m