CVE-2026-13595
MediumCVSS 6.8Exploitation Probability (EPSS)
Low risk3th percentile — higher than 3% of all known CVEs
Summary
A heap use-after-free vulnerability was found in the libblkid library of util-linux. During nested partition probing, a cached pointer to a parent partition entry becomes stale after array reallocation, allowing an attacker to read freed memory.
Risk Assessment
An attacker can trigger this flaw without user interaction by presenting a crafted block device (e.g., via USB or loop-mounted image). Since libblkid runs as root on hot-plug events, this could lead to information disclosure or denial of service.
Recommendation
Immediately update util-linux to a patched version addressing CVE-2026-13595. As a workaround, restrict automatic scanning of untrusted block devices by udev/udisks.
Original NVD description (English source)
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.