{"schema_version":"1.7.2","id":"OESA-2026-2211","modified":"2026-05-09T12:30:48Z","published":"2026-05-09T12:30:48Z","upstream":["CVE-2026-27456"],"summary":"util-linux security update","details":"The util-linux package contains a random collection of files that implements some low-level basic linux utilities.\r\n\r\nSecurity Fix(es):\n\nutil-linux is a random collection of Linux utilities. Prior to version 2.41.4, a TOCTOU (Time-of-Check-Time-of-Use) vulnerability has been identified in the SUID binary /usr/bin/mount from util-linux. The mount binary, when setting up loop devices, validates the source file path with user privileges via fork() + setuid() + realpath(), but subsequently re-canonicalizes and opens it with root privileges (euid=0) without verifying that the path has not been replaced between both operations. Neither O_NOFOLLOW, nor inode comparison, nor post-open fstat() are employed. This allows a local unprivileged user to replace the source file with a symlink pointing to any root-owned file or device during the race window, causing the SUID binary to open and mount it as root. Exploitation requires an /etc/fstab entry with user,loop options whose path points to a directory where the attacker has write permission, and that /usr/bin/mount has the SUID bit set (the default configuration on virtually all Linux distributions). The impact is unauthorized read access to root-protected files and block devices, including backup images, disk volumes, and any file containing a valid filesystem. This issue has been patched in version 2.41.4.(CVE-2026-27456)","affected":[{"package":{"ecosystem":"openEuler:20.03-LTS-SP4","name":"util-linux","purl":"pkg:rpm/openEuler/util-linux&distro=openEuler-20.03-LTS-SP4"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.35.2-29.oe2003sp4"}]}],"ecosystem_specific":{"aarch64":["libblkid-2.35.2-29.oe2003sp4.aarch64.rpm","libfdisk-2.35.2-29.oe2003sp4.aarch64.rpm","libmount-2.35.2-29.oe2003sp4.aarch64.rpm","libsmartcols-2.35.2-29.oe2003sp4.aarch64.rpm","libuuid-2.35.2-29.oe2003sp4.aarch64.rpm","python-libmount-2.35.2-29.oe2003sp4.aarch64.rpm","util-linux-2.35.2-29.oe2003sp4.aarch64.rpm","util-linux-debuginfo-2.35.2-29.oe2003sp4.aarch64.rpm","util-linux-debugsource-2.35.2-29.oe2003sp4.aarch64.rpm","util-linux-devel-2.35.2-29.oe2003sp4.aarch64.rpm","util-linux-user-2.35.2-29.oe2003sp4.aarch64.rpm","uuidd-2.35.2-29.oe2003sp4.aarch64.rpm"],"noarch":["util-linux-help-2.35.2-29.oe2003sp4.noarch.rpm"],"src":["util-linux-2.35.2-29.oe2003sp4.src.rpm"],"x86_64":["libblkid-2.35.2-29.oe2003sp4.x86_64.rpm","libfdisk-2.35.2-29.oe2003sp4.x86_64.rpm","libmount-2.35.2-29.oe2003sp4.x86_64.rpm","libsmartcols-2.35.2-29.oe2003sp4.x86_64.rpm","libuuid-2.35.2-29.oe2003sp4.x86_64.rpm","python-libmount-2.35.2-29.oe2003sp4.x86_64.rpm","util-linux-2.35.2-29.oe2003sp4.x86_64.rpm","util-linux-debuginfo-2.35.2-29.oe2003sp4.x86_64.rpm","util-linux-debugsource-2.35.2-29.oe2003sp4.x86_64.rpm","util-linux-devel-2.35.2-29.oe2003sp4.x86_64.rpm","util-linux-user-2.35.2-29.oe2003sp4.x86_64.rpm","uuidd-2.35.2-29.oe2003sp4.x86_64.rpm"]}},{"package":{"ecosystem":"openEuler:22.03-LTS-SP4","name":"util-linux","purl":"pkg:rpm/openEuler/util-linux&distro=openEuler-22.03-LTS-SP4"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.37.2-52.oe2203sp4"}]}],"ecosystem_specific":{"aarch64":["libblkid-2.37.2-52.oe2203sp4.aarch64.rpm","libfdisk-2.37.2-52.oe2203sp4.aarch64.rpm","libmount-2.37.2-52.oe2203sp4.aarch64.rpm","libsmartcols-2.37.2-52.oe2203sp4.aarch64.rpm","libuuid-2.37.2-52.oe2203sp4.aarch64.rpm","python3-libmount-2.37.2-52.oe2203sp4.aarch64.rpm","util-linux-2.37.2-52.oe2203sp4.aarch64.rpm","util-linux-debuginfo-2.37.2-52.oe2203sp4.aarch64.rpm","util-linux-debugsource-2.37.2-52.oe2203sp4.aarch64.rpm","util-linux-devel-2.37.2-52.oe2203sp4.aarch64.rpm","util-linux-user-2.37.2-52.oe2203sp4.aarch64.rpm","uuidd-2.37.2-52.oe2203sp4.aarch64.rpm"],"noarch":["util-linux-help-2.37.2-52.oe2203sp4.noarch.rpm"],"src":["util-linux-2.37.2-52.oe2203sp4.src.rpm"],"x86_64":["libblkid-2.37.2-52.oe2203sp4.x86_64.rpm","libfdisk-2.37.2-52.oe2203sp4.x86_64.rpm","libmount-2.37.2-52.oe2203sp4.x86_64.rpm","libsmartcols-2.37.2-52.oe2203sp4.x86_64.rpm","libuuid-2.37.2-52.oe2203sp4.x86_64.rpm","python3-libmount-2.37.2-52.oe2203sp4.x86_64.rpm","util-linux-2.37.2-52.oe2203sp4.x86_64.rpm","util-linux-debuginfo-2.37.2-52.oe2203sp4.x86_64.rpm","util-linux-debugsource-2.37.2-52.oe2203sp4.x86_64.rpm","util-linux-devel-2.37.2-52.oe2203sp4.x86_64.rpm","util-linux-user-2.37.2-52.oe2203sp4.x86_64.rpm","uuidd-2.37.2-52.oe2203sp4.x86_64.rpm"]}},{"package":{"ecosystem":"openEuler:24.03-LTS","name":"util-linux","purl":"pkg:rpm/openEuler/util-linux&distro=openEuler-24.03-LTS"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.39.1-38.oe2403sp3"}]}],"ecosystem_specific":{"aarch64":["libblkid-2.39.1-38.oe2403.aarch64.rpm","libfdisk-2.39.1-38.oe2403.aarch64.rpm","libmount-2.39.1-38.oe2403.aarch64.rpm","libsmartcols-2.39.1-38.oe2403.aarch64.rpm","libuuid-2.39.1-38.oe2403.aarch64.rpm","python3-libmount-2.39.1-38.oe2403.aarch64.rpm","util-linux-2.39.1-38.oe2403.aarch64.rpm","util-linux-debuginfo-2.39.1-38.oe2403.aarch64.rpm","util-linux-debugsource-2.39.1-38.oe2403.aarch64.rpm","util-linux-devel-2.39.1-38.oe2403.aarch64.rpm","util-linux-user-2.39.1-38.oe2403.aarch64.rpm","uuidd-2.39.1-38.oe2403.aarch64.rpm","libblkid-2.39.1-38.oe2403sp1.aarch64.rpm","libfdisk-2.39.1-38.oe2403sp1.aarch64.rpm","libmount-2.39.1-38.oe2403sp1.aarch64.rpm","libsmartcols-2.39.1-38.oe2403sp1.aarch64.rpm","libuuid-2.39.1-38.oe2403sp1.aarch64.rpm","python3-libmount-2.39.1-38.oe2403sp1.aarch64.rpm","util-linux-2.39.1-38.oe2403sp1.aarch64.rpm","util-linux-debuginfo-2.39.1-38.oe2403sp1.aarch64.rpm","util-linux-debugsource-2.39.1-38.oe2403sp1.aarch64.rpm","util-linux-devel-2.39.1-38.oe2403sp1.aarch64.rpm","util-linux-user-2.39.1-38.oe2403sp1.aarch64.rpm","uuidd-2.39.1-38.oe2403sp1.aarch64.rpm","libblkid-2.39.1-38.oe2403sp3.aarch64.rpm","libfdisk-2.39.1-38.oe2403sp3.aarch64.rpm","libmount-2.39.1-38.oe2403sp3.aarch64.rpm","libsmartcols-2.39.1-38.oe2403sp3.aarch64.rpm","libuuid-2.39.1-38.oe2403sp3.aarch64.rpm","python3-libmount-2.39.1-38.oe2403sp3.aarch64.rpm","util-linux-2.39.1-38.oe2403sp3.aarch64.rpm","util-linux-debuginfo-2.39.1-38.oe2403sp3.aarch64.rpm","util-linux-debugsource-2.39.1-38.oe2403sp3.aarch64.rpm","util-linux-devel-2.39.1-38.oe2403sp3.aarch64.rpm","util-linux-user-2.39.1-38.oe2403sp3.aarch64.rpm","uuidd-2.39.1-38.oe2403sp3.aarch64.rpm"],"noarch":["util-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zh/security/security-bulletins/detail/?id=openEuler-SA-2026-2211"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-27456"}],"database_specific":{"severity":"Medium"}}