Red Hat libblkid use after free

CVSS Meta Temp Score
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CTI Interest Score
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5.9$0-$5k2.34+

Summaryinfo

A vulnerability was found in Red Hat. It has been classified as critical. This impacts an unknown function of the component libblkid. The manipulation leads to use after free. This vulnerability is listed as CVE-2026-13595. The attack must be carried out locally. There is no available exploit. To fix this issue, it is recommended to deploy a patch.

Detailsinfo

A vulnerability was found in Red Hat (unknown version) and classified as critical. This issue affects an unknown code block of the component libblkid. The manipulation with an unknown input leads to a use after free vulnerability. Using CWE to declare the problem leads to CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at access.redhat.com. The identification of this vulnerability is CVE-2026-13595 since 06/29/2026. The exploitation is known to be easy. Attacking locally is a requirement. The technical details are unknown and an exploit is not publicly available.

Applying the patch c0186f14fbdb02f64c8e0ba701ce727ea764ff4c is able to eliminate this problem. The bugfix is ready for download at github.com.

The vulnerability is also documented in the vulnerability database at CERT Bund (WID-SEC-2026-2121). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Affected

  • Open Source util-linux

Productinfo

Name

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.0
VulDB Meta Temp Score: 5.9

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 6.8
CNA Vector (redhat): 🔒

CVSSv2info

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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔒

Patch: c0186f14fbdb02f64c8e0ba701ce727ea764ff4c

Timelineinfo

06/29/2026 Advisory disclosed
06/29/2026 +0 days CVE reserved
06/29/2026 +0 days VulDB entry created
06/29/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: access.redhat.com
Status: Confirmed

CVE: CVE-2026-13595 (🔒)
GCVE (CVE): GCVE-0-2026-13595
GCVE (VulDB): GCVE-100-374603
CERT Bund: WID-SEC-2026-2121 - util-linux: Schwachstelle ermöglicht Denial of Service und Offenlegung von Informationen

Entryinfo

Created: 06/29/2026 14:15
Updated: 06/29/2026 16:00
Changes: 06/29/2026 14:15 (63), 06/29/2026 16:00 (7)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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