QSN-8702-1: util-linux vulnerabilities 2026-08-31 Summary: Several security issues were fixed in util-linux. Details: It was discovered that libblkid in util-linux had a heap use-after-free vulnerability during nested partition probing. An attacker who could present a crafted block device image could possibly use this issue to obtain sensitive information or cause a denial of service. (CVE-2026-13595) It was discovered that the mount utility in util-linux had a time-of-check- time-of-use vulnerability when setting up loop devices. A local attacker could possibly use this issue to obtain unauthorized read access to root- protected files and block devices. (CVE-2026-27456) It was discovered that the login utility in util-linux improperly canonicalized hostnames when invoked with the -h option. A remote attacker could possibly use this issue to bypass host-based access control rules. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-3184) It was discovered that libmount in util-linux had a time-of-check-time-of- use vulnerability in its ownership hook. A local attacker could possibly use this issue to gain elevated privileges. This issue only affected Ubuntu 24.04 LTS and Ubuntu 26.04 LTS. (CVE-2026-53612) It was discovered that libmount in util-linux had a time-of-check-time-of- use vulnerability that allowed target path redirection during mount operations. A local attacker could possibly use this issue to gain elevated privileges. (CVE-2026-53613) It was discovered that libmount in util-linux improperly handled the LIBMOUNT_FORCE_MOUNT2 environment variable in the SUID mount utility. A local attacker could possibly use this issue to bypass nosuid and noexec mount options and gain elevated privileges. This issue only affected Ubuntu 24.04 LTS and Ubuntu 26.04 LTS. (CVE-2026-53614) It was discovered that libblkid in util-linux had an integer overflow vulnerability when parsing DOS partition tables. An attacker who could present a crafted block device image could possibly use this issue to cause a denial of service. (CVE-2026-53615) Affected QuantaStor releases: 6.9.1.001 jammy: bsdextrautils 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.9.1.001 jammy: bsdutils 1:2.37.2-4ubuntu3.4 (fixed in 1:2.37.2-4ubuntu3.6) 6.9.1.001 jammy: eject 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.9.1.001 jammy: fdisk 2.37.2-4ubuntu3.6 (fixed in 2.37.2-4ubuntu3.6) 6.9.1.001 jammy: libblkid1 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.9.1.001 jammy: libfdisk1 2.37.2-4ubuntu3.6 (fixed in 2.37.2-4ubuntu3.6) 6.9.1.001 jammy: libmount1 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.9.1.001 jammy: libsmartcols1 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.9.1.001 jammy: libuuid1 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.9.1.001 jammy: mount 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.9.1.001 jammy: util-linux 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.9.1.001 jammy: uuid-runtime 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.9.0.464 jammy: bsdextrautils 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.9.0.464 jammy: bsdutils 1:2.37.2-4ubuntu3.4 (fixed in 1:2.37.2-4ubuntu3.6) 6.9.0.464 jammy: eject 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.9.0.464 jammy: fdisk 2.37.2-4ubuntu3.6 (fixed in 2.37.2-4ubuntu3.6) 6.9.0.464 jammy: libblkid1 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.9.0.464 jammy: libfdisk1 2.37.2-4ubuntu3.6 (fixed in 2.37.2-4ubuntu3.6) 6.9.0.464 jammy: libmount1 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.9.0.464 jammy: libsmartcols1 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.9.0.464 jammy: libuuid1 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.9.0.464 jammy: mount 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.9.0.464 jammy: util-linux 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.9.0.464 jammy: uuid-runtime 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.6.015 jammy: bsdextrautils 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.6.015 jammy: bsdutils 1:2.37.2-4ubuntu3.4 (fixed in 1:2.37.2-4ubuntu3.6) 6.8.6.015 jammy: eject 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.6.015 jammy: fdisk 2.37.2-4ubuntu3.6 (fixed in 2.37.2-4ubuntu3.6) 6.8.6.015 jammy: libblkid1 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.6.015 jammy: libfdisk1 2.37.2-4ubuntu3.6 (fixed in 2.37.2-4ubuntu3.6) 6.8.6.015 jammy: libmount1 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.6.015 jammy: libsmartcols1 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.6.015 jammy: libuuid1 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.6.015 jammy: mount 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.6.015 jammy: util-linux 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.6.015 jammy: uuid-runtime 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.5.018 jammy: bsdextrautils 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.5.018 jammy: bsdutils 1:2.37.2-4ubuntu3.4 (fixed in 1:2.37.2-4ubuntu3.6) 6.8.5.018 jammy: eject 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.5.018 jammy: fdisk 2.37.2-4ubuntu3.5 (fixed in 2.37.2-4ubuntu3.6) 6.8.5.018 jammy: libblkid1 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.5.018 jammy: libfdisk1 2.37.2-4ubuntu3.5 (fixed in 2.37.2-4ubuntu3.6) 6.8.5.018 jammy: libmount1 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.5.018 jammy: libsmartcols1 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.5.018 jammy: libuuid1 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.5.018 jammy: mount 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.5.018 jammy: util-linux 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.5.018 jammy: uuid-runtime 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.4.038 jammy: bsdextrautils 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.4.038 jammy: bsdutils 1:2.37.2-4ubuntu3.4 (fixed in 1:2.37.2-4ubuntu3.6) 6.8.4.038 jammy: eject 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.4.038 jammy: fdisk 2.37.2-4ubuntu3.5 (fixed in 2.37.2-4ubuntu3.6) 6.8.4.038 jammy: libblkid1 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.4.038 jammy: libfdisk1 2.37.2-4ubuntu3.5 (fixed in 2.37.2-4ubuntu3.6) 6.8.4.038 jammy: libmount1 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.4.038 jammy: libsmartcols1 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.4.038 jammy: libuuid1 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.4.038 jammy: mount 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.4.038 jammy: util-linux 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.4.038 jammy: uuid-runtime 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.3.018 jammy: bsdextrautils 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.3.018 jammy: bsdutils 1:2.37.2-4ubuntu3.4 (fixed in 1:2.37.2-4ubuntu3.6) 6.8.3.018 jammy: eject 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.3.018 jammy: fdisk 2.37.2-4ubuntu3.5 (fixed in 2.37.2-4ubuntu3.6) 6.8.3.018 jammy: libblkid1 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.3.018 jammy: libfdisk1 2.37.2-4ubuntu3.5 (fixed in 2.37.2-4ubuntu3.6) 6.8.3.018 jammy: libmount1 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.3.018 jammy: libsmartcols1 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.3.018 jammy: libuuid1 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.3.018 jammy: mount 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.3.018 jammy: util-linux 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.3.018 jammy: uuid-runtime 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.2.002 jammy: bsdextrautils 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.2.002 jammy: bsdutils 1:2.37.2-4ubuntu3.4 (fixed in 1:2.37.2-4ubuntu3.6) 6.8.2.002 jammy: eject 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.2.002 jammy: fdisk 2.37.2-4ubuntu3.5 (fixed in 2.37.2-4ubuntu3.6) 6.8.2.002 jammy: libblkid1 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.2.002 jammy: libfdisk1 2.37.2-4ubuntu3.5 (fixed in 2.37.2-4ubuntu3.6) 6.8.2.002 jammy: libmount1 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.2.002 jammy: libsmartcols1 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.2.002 jammy: libuuid1 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.2.002 jammy: mount 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.2.002 jammy: util-linux 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.2.002 jammy: uuid-runtime 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.1.007 jammy: bsdextrautils 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.1.007 jammy: bsdutils 1:2.37.2-4ubuntu3.4 (fixed in 1:2.37.2-4ubuntu3.6) 6.8.1.007 jammy: eject 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.1.007 jammy: fdisk 2.37.2-4ubuntu3.5 (fixed in 2.37.2-4ubuntu3.6) 6.8.1.007 jammy: libblkid1 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.1.007 jammy: libfdisk1 2.37.2-4ubuntu3.5 (fixed in 2.37.2-4ubuntu3.6) 6.8.1.007 jammy: libmount1 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.1.007 jammy: libsmartcols1 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.1.007 jammy: libuuid1 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.1.007 jammy: mount 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.1.007 jammy: util-linux 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.1.007 jammy: uuid-runtime 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.0.205 jammy: bsdextrautils 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.0.205 jammy: bsdutils 1:2.37.2-4ubuntu3.4 (fixed in 1:2.37.2-4ubuntu3.6) 6.8.0.205 jammy: eject 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.0.205 jammy: fdisk 2.37.2-4ubuntu3.5 (fixed in 2.37.2-4ubuntu3.6) 6.8.0.205 jammy: libblkid1 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.0.205 jammy: libfdisk1 2.37.2-4ubuntu3.5 (fixed in 2.37.2-4ubuntu3.6) 6.8.0.205 jammy: libmount1 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.0.205 jammy: libsmartcols1 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.0.205 jammy: libuuid1 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.0.205 jammy: mount 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.0.205 jammy: util-linux 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) 6.8.0.205 jammy: uuid-runtime 2.37.2-4ubuntu3.4 (fixed in 2.37.2-4ubuntu3.6) CVEs: CVE-2026-53615, CVE-2026-13595, CVE-2026-53614, CVE-2026-27456, CVE-2026-53612, CVE-2026-3184, CVE-2026-53613 References: https://ubuntu.com/security/notices/USN-8702-1