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CVE-2026-13595— Util-linux: util-linux: heap use-after-free in libblkid nested partition probing

Quick assessment

Affected
Red Hat Red Hat Hardened Images
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

util-linux是util-linux组织开源的一个软件包。 util-linux存在资源管理错误漏洞，该漏洞源于在嵌套分区探测过程中，BSD、Minix、Solaris x86和UnixWare分区探测程序在动态分配的数组中缓存指向父分区条目的原始指针，当后续分区添加导致数组重新分配时，该指针失效，导致堆释放后重用读取。攻击者可以通过呈现特制块设备映像（如通过USB插入或循环挂载的磁盘映像）触发此漏洞，可能导致有限的信息泄露或拒绝服务。以下版本受到影响：Red Hat Enterprise Linu

CVSS 6.8 · Medium EPSS 0.17% · P6

Affected Version Matrix 7

VendorProduct Version RangeStatus
Red Hat Red Hat Enterprise Linux 10 any affected
Red Hat Red Hat Enterprise Linux 7 any affected
Red Hat Red Hat Enterprise Linux 8 any affected
Red Hat Red Hat Enterprise Linux 9 any affected
Red Hat Red Hat Hardened Images 2.42.2-1.hum1< * unaffected
Red Hat Red Hat OpenShift Container Platform 4 any affected
any affected
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I. Basic Information for CVE-2026-13595

Vulnerability Information
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Vulnerability Title
Util-linux: util-linux: heap use-after-free in libblkid nested partition probing
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
util-linux 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
util-linux是util-linux组织开源的一个软件包。 util-linux存在资源管理错误漏洞，该漏洞源于在嵌套分区探测过程中，BSD、Minix、Solaris x86和UnixWare分区探测程序在动态分配的数组中缓存指向父分区条目的原始指针，当后续分区添加导致数组重新分配时，该指针失效，导致堆释放后重用读取。攻击者可以通过呈现特制块设备映像（如通过USB插入或循环挂载的磁盘映像）触发此漏洞，可能导致有限的信息泄露或拒绝服务。以下版本受到影响：Red Hat Enterprise Linu
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Hardened Images 2.42.2-1.hum1 ~ * cpe:/a:redhat:hummingbird:1
Red Hat Red Hat Enterprise Linux 10 - cpe:/o:redhat:enterprise_linux:10
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9
Red Hat Red Hat OpenShift Container Platform 4 - cpe:/a:redhat:openshift:4
Red Hat Red Hat OpenShift Container Platform 4 - cpe:/a:redhat:openshift:4

II. Public POCs for CVE-2026-13595

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III. Intelligence Information for CVE-2026-13595

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Patches & Fixes for CVE-2026-13595 (1)

Vendor Advisories for CVE-2026-13595 (3)

Same Patch Batch · Red Hat · 2026-06-29 · 7 CVEs total

CVE-2026-12856 8.8 HIGH Vscode-java: vscode: command injection vulnerability in the javadoc hover provider of the
CVE-2026-12912 7.3 HIGH Libtiff: libtiff: heap-based buffer overflow via crafted pixarlog-compressed tiff image
CVE-2026-13601 7.1 HIGH Yelp: yelp-xsl: overly permissive content security policy in yelp allows host file disclos
CVE-2026-13757 6.2 MEDIUM P11-kit: stack exhaustion via unbounded recursion in rpc attribute parsing
CVE-2026-57965 5.1 MEDIUM Spice-vdagent: integer overflow in udscs_write() leading to heap buffer overflow
CVE-2026-57966 4.4 MEDIUM Spice-vdagent: path traversal in file transfer via unsanitized filename

IV. Related Vulnerabilities

Same product: Red Hat Hardened Images
Same vendor: Red Hat
Same weakness: CWE-416

V. Comments for CVE-2026-13595

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