CVE-2026-13595

Util-linux: util-linux: heap use-after-free in libblkid nested partition probing

CVSS 3.1 6.8 MEDIUMCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-13595

Published

A flaw was found in the libblkid library of util-linux. During nested partition probing, the BSD, Minix, Solaris x86, and UnixWare partition probers cache a raw pointer to a parent partition entry in a dynamically allocated array. When subsequent partition additions cause the array to be reallocated, this pointer becomes stale, leading to a heap use-after-free read. An attacker who can present a crafted block device image (for example, via USB insertion or a loop-mounted disk image) can trigger this flaw without user interaction, as libblkid is invoked automatically by udev/udisks as root on block-device hot-plug events. This could lead to limited information disclosure or denial of service.

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Affected versions, risk and source history

Exploitation and risk

Source status

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Risk history

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Advisory history

8 saved versions

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12 Nov 2026 11:53:18 UTC