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QSN-8702-1: util-linux vulnerabilities

August 31, 2026

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

ReleasePlatformPackageExposureShipped versionFixed versionStatus
6.9.1.001Ubuntu 22.04 LTSbsdextrautilsInternally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.9.1.001Ubuntu 22.04 LTSbsdutilsInternally-facing1:2.37.2-4ubuntu3.41:2.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.9.1.001Ubuntu 22.04 LTSejectInternally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.9.1.001Ubuntu 22.04 LTSfdiskInternally-facing2.37.2-4ubuntu3.62.37.2-4ubuntu3.6Fixed in this release
6.9.1.001Ubuntu 22.04 LTSlibblkid1Externally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.9.1.001Ubuntu 22.04 LTSlibfdisk1Internally-facing2.37.2-4ubuntu3.62.37.2-4ubuntu3.6Fixed in this release
6.9.1.001Ubuntu 22.04 LTSlibmount1Externally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.9.1.001Ubuntu 22.04 LTSlibsmartcols1Internally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.9.1.001Ubuntu 22.04 LTSlibuuid1Externally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.9.1.001Ubuntu 22.04 LTSmountInternally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.9.1.001Ubuntu 22.04 LTSutil-linuxInternally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.9.1.001Ubuntu 22.04 LTSuuid-runtimeInternally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.9.0.464Ubuntu 22.04 LTSbsdextrautilsInternally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.9.0.464Ubuntu 22.04 LTSbsdutilsInternally-facing1:2.37.2-4ubuntu3.41:2.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.9.0.464Ubuntu 22.04 LTSejectInternally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.9.0.464Ubuntu 22.04 LTSfdiskInternally-facing2.37.2-4ubuntu3.62.37.2-4ubuntu3.6Fixed in this release
6.9.0.464Ubuntu 22.04 LTSlibblkid1Externally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.9.0.464Ubuntu 22.04 LTSlibfdisk1Internally-facing2.37.2-4ubuntu3.62.37.2-4ubuntu3.6Fixed in this release
6.9.0.464Ubuntu 22.04 LTSlibmount1Externally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.9.0.464Ubuntu 22.04 LTSlibsmartcols1Internally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.9.0.464Ubuntu 22.04 LTSlibuuid1Externally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.9.0.464Ubuntu 22.04 LTSmountInternally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.9.0.464Ubuntu 22.04 LTSutil-linuxInternally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.9.0.464Ubuntu 22.04 LTSuuid-runtimeInternally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.6.015Ubuntu 22.04 LTSbsdextrautilsInternally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.6.015Ubuntu 22.04 LTSbsdutilsInternally-facing1:2.37.2-4ubuntu3.41:2.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.6.015Ubuntu 22.04 LTSejectInternally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.6.015Ubuntu 22.04 LTSfdiskInternally-facing2.37.2-4ubuntu3.62.37.2-4ubuntu3.6Fixed in this release
6.8.6.015Ubuntu 22.04 LTSlibblkid1Externally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.6.015Ubuntu 22.04 LTSlibfdisk1Internally-facing2.37.2-4ubuntu3.62.37.2-4ubuntu3.6Fixed in this release
6.8.6.015Ubuntu 22.04 LTSlibmount1Externally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.6.015Ubuntu 22.04 LTSlibsmartcols1Internally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.6.015Ubuntu 22.04 LTSlibuuid1Externally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.6.015Ubuntu 22.04 LTSmountInternally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.6.015Ubuntu 22.04 LTSutil-linuxInternally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.6.015Ubuntu 22.04 LTSuuid-runtimeInternally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.5.018Ubuntu 22.04 LTSbsdextrautilsInternally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.5.018Ubuntu 22.04 LTSbsdutilsInternally-facing1:2.37.2-4ubuntu3.41:2.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.5.018Ubuntu 22.04 LTSejectInternally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.5.018Ubuntu 22.04 LTSfdiskInternally-facing2.37.2-4ubuntu3.52.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.5.018Ubuntu 22.04 LTSlibblkid1Externally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.5.018Ubuntu 22.04 LTSlibfdisk1Internally-facing2.37.2-4ubuntu3.52.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.5.018Ubuntu 22.04 LTSlibmount1Externally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.5.018Ubuntu 22.04 LTSlibsmartcols1Internally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.5.018Ubuntu 22.04 LTSlibuuid1Externally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.5.018Ubuntu 22.04 LTSmountInternally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.5.018Ubuntu 22.04 LTSutil-linuxInternally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.5.018Ubuntu 22.04 LTSuuid-runtimeInternally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.4.038Ubuntu 22.04 LTSbsdextrautilsInternally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.4.038Ubuntu 22.04 LTSbsdutilsInternally-facing1:2.37.2-4ubuntu3.41:2.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.4.038Ubuntu 22.04 LTSejectInternally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.4.038Ubuntu 22.04 LTSfdiskInternally-facing2.37.2-4ubuntu3.52.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.4.038Ubuntu 22.04 LTSlibblkid1Externally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.4.038Ubuntu 22.04 LTSlibfdisk1Internally-facing2.37.2-4ubuntu3.52.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.4.038Ubuntu 22.04 LTSlibmount1Externally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.4.038Ubuntu 22.04 LTSlibsmartcols1Internally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.4.038Ubuntu 22.04 LTSlibuuid1Externally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.4.038Ubuntu 22.04 LTSmountInternally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.4.038Ubuntu 22.04 LTSutil-linuxInternally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.4.038Ubuntu 22.04 LTSuuid-runtimeInternally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.3.018Ubuntu 22.04 LTSbsdextrautilsInternally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.3.018Ubuntu 22.04 LTSbsdutilsInternally-facing1:2.37.2-4ubuntu3.41:2.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.3.018Ubuntu 22.04 LTSejectInternally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.3.018Ubuntu 22.04 LTSfdiskInternally-facing2.37.2-4ubuntu3.52.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.3.018Ubuntu 22.04 LTSlibblkid1Externally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.3.018Ubuntu 22.04 LTSlibfdisk1Internally-facing2.37.2-4ubuntu3.52.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.3.018Ubuntu 22.04 LTSlibmount1Externally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.3.018Ubuntu 22.04 LTSlibsmartcols1Internally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.3.018Ubuntu 22.04 LTSlibuuid1Externally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.3.018Ubuntu 22.04 LTSmountInternally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.3.018Ubuntu 22.04 LTSutil-linuxInternally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.3.018Ubuntu 22.04 LTSuuid-runtimeInternally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.2.002Ubuntu 22.04 LTSbsdextrautilsInternally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.2.002Ubuntu 22.04 LTSbsdutilsInternally-facing1:2.37.2-4ubuntu3.41:2.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.2.002Ubuntu 22.04 LTSejectInternally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.2.002Ubuntu 22.04 LTSfdiskInternally-facing2.37.2-4ubuntu3.52.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.2.002Ubuntu 22.04 LTSlibblkid1Externally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.2.002Ubuntu 22.04 LTSlibfdisk1Internally-facing2.37.2-4ubuntu3.52.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.2.002Ubuntu 22.04 LTSlibmount1Externally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.2.002Ubuntu 22.04 LTSlibsmartcols1Internally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.2.002Ubuntu 22.04 LTSlibuuid1Externally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.2.002Ubuntu 22.04 LTSmountInternally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.2.002Ubuntu 22.04 LTSutil-linuxInternally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.2.002Ubuntu 22.04 LTSuuid-runtimeInternally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.1.007Ubuntu 22.04 LTSbsdextrautilsInternally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.1.007Ubuntu 22.04 LTSbsdutilsInternally-facing1:2.37.2-4ubuntu3.41:2.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.1.007Ubuntu 22.04 LTSejectInternally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.1.007Ubuntu 22.04 LTSfdiskInternally-facing2.37.2-4ubuntu3.52.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.1.007Ubuntu 22.04 LTSlibblkid1Externally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.1.007Ubuntu 22.04 LTSlibfdisk1Internally-facing2.37.2-4ubuntu3.52.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.1.007Ubuntu 22.04 LTSlibmount1Externally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.1.007Ubuntu 22.04 LTSlibsmartcols1Internally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.1.007Ubuntu 22.04 LTSlibuuid1Externally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.1.007Ubuntu 22.04 LTSmountInternally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.1.007Ubuntu 22.04 LTSutil-linuxInternally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.1.007Ubuntu 22.04 LTSuuid-runtimeInternally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.0.205Ubuntu 22.04 LTSbsdextrautilsInternally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.0.205Ubuntu 22.04 LTSbsdutilsInternally-facing1:2.37.2-4ubuntu3.41:2.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.0.205Ubuntu 22.04 LTSejectInternally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.0.205Ubuntu 22.04 LTSfdiskInternally-facing2.37.2-4ubuntu3.52.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.0.205Ubuntu 22.04 LTSlibblkid1Externally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.0.205Ubuntu 22.04 LTSlibfdisk1Internally-facing2.37.2-4ubuntu3.52.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.0.205Ubuntu 22.04 LTSlibmount1Externally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.0.205Ubuntu 22.04 LTSlibsmartcols1Internally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.0.205Ubuntu 22.04 LTSlibuuid1Externally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.0.205Ubuntu 22.04 LTSmountInternally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.0.205Ubuntu 22.04 LTSutil-linuxInternally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update
6.8.0.205Ubuntu 22.04 LTSuuid-runtimeInternally-facing2.37.2-4ubuntu3.42.37.2-4ubuntu3.6Fixed by QuantaStor security update

Internally-facing: only accessible when logged into the QuantaStor console/ssh as the qadmin administrative sudo user; generally lower priority. Externally-facing: part of a service the storage platform presents on the network (or the kernel), so potentially reachable over the network.

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

https://nvd.nist.gov/vuln/detail/CVE-2026-53615

https://nvd.nist.gov/vuln/detail/CVE-2026-13595

https://nvd.nist.gov/vuln/detail/CVE-2026-53614

https://nvd.nist.gov/vuln/detail/CVE-2026-27456

https://nvd.nist.gov/vuln/detail/CVE-2026-53612

https://nvd.nist.gov/vuln/detail/CVE-2026-3184

https://nvd.nist.gov/vuln/detail/CVE-2026-53613

Update

Fixes marked Fixed by QuantaStor security update are applied by upgrading QuantaStor with security patches included (Upgrade Manager). Fixed package versions:

PlatformPackageVersion
Ubuntu 22.04 LTSutil-linux2.37.2-4ubuntu3.6
Ubuntu 24.04 LTSutil-linux2.39.3-9ubuntu6.6
resoluteutil-linux2.41.3-3ubuntu2.2