Fedora 43 util-linux Important SUID Symlink Attack CVE-2026-27456
fedora
April 10, 2026
upstream update, fixes security-related bugs CVE-2026-27456 - mount(8) TOCTOU symlink attack via loop device
Summary
The util-linux package contains a large variety of low-level system
utilities that are necessary for a Linux system to function. Among
others, util-linux contains the fdisk configuration tool and the login
program.
Update Information:
upstream update, fixes security-related bugs CVE-2026-27456 - mount(8) TOCTOU symlink attack via loop device. The SUID mount follows symlinks when resolving loop backing file paths. On systems where non-root users are permitted to mount loop devices (via 'user' option in fstab), this allows access to arbitrary files. CWE-190 - Integer overflow in libblkid parse_dos_extended(). A crafted MBR disk image can cause uint32_t wraparound in EBR chain processing, causing reported partitions to not match the on-disk layout. Tools like udisks may then register a partition at logical sector 0.
Change Log
* Wed Apr 1 2026 Karel Zak
References
Fedora Update Notification
FEDORA-2026-840b40ef4c
2026-04-10 00:59:15.834457+00:00
Name : util-linux
Product : Fedora 43
Version : 2.41.4
Release : 7.fc43
URL : https://en.wikipedia.org/wiki/Util-linux
Summary : Collection of basic system utilities
Description :
The util-linux package contains a large variety of low-level system
utilities that are necessary for a Linux system to function. Among
others, util-linux contains the fdisk configuration tool and the login
program.
Update Instructions
This update can be installed with the "dnf" update program. Use su -c 'dnf upgrade --advisory FEDORA-2026-840b40ef4c' at the command line. For more information, refer to the dnf documentation available at http://dnf.readthedocs.io/en/latest/command_ref.html#upgrade-command-label
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Name: util-linux
Product: Fedora 43
Version: 2.41.4
Release: 7.fc43
Summary: Collection of basic system utilities
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