CVE-2026-13595

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.

• util-linux 2.42.2-1 https://bugzilla.redhat.com/show_bug.cgi?id=2494101 https://github.com/util-linux/util-linux/commit/c0186f14fbdb02f64c8e0ba701ce727ea764ff4c (master) https://github.com/util-linux/util-linux/commit/60ca8616ac1a223bfb5a713047a37136dd9481ef (v2.42.2) https://github.com/util-linux/util-linux/commit/132d9c8aa15a8efd0a23d8ca7ed8b98f365e84fa (v2.41.5)