CVE-2026-13595
MediumCVSS 6.8Exploitation Probability (EPSS)
Low risk1th percentile - higher than 1% 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 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 inserting a crafted USB device or mounting a disk image. Since libblkid runs automatically as root via udev/udisks on block-device 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.
Other vulnerabilities in util-linux
See all- CVE-2014-9114High
Blkid in util-linux before version 2.26rc-1 allows local users to execute arbitrary code.
- CVE-2016-2779High
CVE-2016-2779 vulnerability in runuser in util-linux allows local users to escape to the parent session via a crafted TIOCSTI ioctl call, which pushes characters to the terminal's input buffer.
- CVE-2015-5224Critical
The mkostemp function in login-utils in util-linux, when used incorrectly, allows remote attackers to cause file name collision and possibly other attacks.
- CVE-2026-27456Medium
In util-linux prior to version 2.41.4, a TOCTOU vulnerability has been identified in the SUID binary /usr/bin/mount. When setting up loop devices, mount validates the source file path with user privileges but later re-canonicalizes and opens it with root privileges without verifying that the path has not been replaced. A local unprivileged user can replace the source file with a symlink pointing to any root-owned file or device.
- CVE-2026-3184Low
A flaw was found in util-linux. Improper hostname canonicalization in the `login(1)` utility, when invoked with the `-h` option, can modify the supplied remote hostname before setting `PAM_RHOST`. A remote attacker could exploit this by providing a specially crafted hostname, potentially bypassing host-based PAM access control rules that rely on fully qualified domain names.
- CVE-2025-14104Medium
A flaw was found in util-linux that allows a heap buffer overread when processing 256-byte usernames in the `setpwnam()` function. This affects SUID login-utils utilities that write to the password database.
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.