PT-2026-80505 · Julia · Libmount Jll+1

Published

2026-08-12

·

Updated

2026-08-12

CVSS v3.1

5.3

Medium

VectorAV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:H
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.

Fix

Found an issue in the description? Have something to add? Feel free to write us 👾

Related Identifiers

JLSEC-2026-1263

Affected Products

Libmount Jll
Util Linux Jll