CVE-2026-13595
Publication date 29 June 2026
Last updated 31 August 2026
Ubuntu priority
Medium
Description
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.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| util-linux | 26.04 LTS resolute |
Fixed 2.41.3-3ubuntu2.2
|
| 25.10 questing | Ignored end of life, was needs-triage | |
| 24.04 LTS noble |
Fixed 2.39.3-9ubuntu6.6
|
|
| 22.04 LTS jammy |
Fixed 2.37.2-4ubuntu3.6
|
|
| 20.04 LTS focal |
Needs evaluation
|
|
| 18.04 LTS bionic |
Needs evaluation
|
|
| 16.04 LTS xenial |
Needs evaluation
|
|
| 14.04 LTS trusty |
Needs evaluation
|
Patch details
For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?
| Package | Patch details |
|---|---|
| util-linux |
Severity score breakdown
CVSS version: CVSS v3.0
Base score 6.8 · Medium
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
References
Related Ubuntu Security Notices (USN)
- USN-8702-1
- util-linux vulnerabilities
- 31 August 2026