CVE-2026-13595: A flaw was found in the libblkid library of util-linux

Q: How do I fix CVE-2026-13595?

hardened images: mitigate or apply the listed mitigation; openshift container platform: upgrade to newer than 4.22.1; enterprise linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2026-13595 being exploited?

CVE-2026-13595 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-13595 affect?

CVE-2026-13595 affects hardened images, openshift container platform, enterprise linux. Severity is medium (CVSS 6.8). 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 subs

Q: How urgent is CVE-2026-13595?

Priority 30/100. On your watchlist

Routine

MEDIUM 6.8WATCHLISTMITIGATEUPGRADEMITIGATE

CVE-2026-13595 is a medium-severity flaw (CVSS 6.8) affecting hardened images, openshift container platform, enterprise linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 in

Why this priority

On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	6.8 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.1% (top 96%)
CISA exploited list	No
Weakness	CWE-416
Published	2026-06-29
Last modified	2026-10-30

Publisher (CNA): Red Hat, Inc. · Vendor: kernel · redhat

Last updated 2026-10-30 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-29 09:16 UTCPublished CVE record published
2026-10-30 14:17 UTCUpdated Record last modified

redhat hardened images MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy hardened-images || rpm -q hardened-images || hardened-images --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

redhat openshift container platform UPGRADE

Affected: >= 4.0 and <= 4.22.1

Fixed in: newer than 4.22.1

Safe to downgrade to: a release before 4.0

1. Check installed version

apt-cache policy openshift-container-platform || rpm -q openshift-container-platform || openshift-container-platform --version

2. UPGRADE to newer than 4.22.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade openshift-container-platform

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade openshift-container-platform

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 4.0 (Debian / Ubuntu)

apt-cache madison openshift-container-platform sudo apt install openshift-container-platform=<VERSION_BEFORE_4.0> sudo apt-mark hold openshift-container-platform

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list openshift-container-platform sudo dnf downgrade openshift-container-platform-<VERSION_BEFORE_4.0> sudo dnf versionlock add openshift-container-platform

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

redhat enterprise linux MITIGATE

Affected: 7.0 · 8.0 · 9.0 · 10.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 7.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

kernel util-linux UPGRADE

Affected: < 2.42.2

Fixed in: 2.42.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy util-linux || rpm -q util-linux || util-linux --version

2. UPGRADE to 2.42.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade util-linux

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade util-linux

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-13595?

hardened images: mitigate or apply the listed mitigation; openshift container platform: upgrade to newer than 4.22.1; enterprise linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-13595 being exploited?

CVE-2026-13595 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-13595 affect?

CVE-2026-13595 affects hardened images, openshift container platform, enterprise linux. Severity is medium (CVSS 6.8). 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 subs

How urgent is CVE-2026-13595?

Priority 30/100. On your watchlist

Software pages

Linux kernel vulnerabilities · Red Hat OpenShift vulnerabilities

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References

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