What’s Vulnerable › Vulnerabilities

CVE-2026-88265: Crun: crun: /dev/null symlink follow during stdio reopen allows host bind-mount write and chown

• Severity: medium (CVSS 5.6 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-10 · updated 2026-10-02
• Weakness: CWE-59

Description

A flaw was found in crun. After pivot_root, reopening /dev/null for stdio can follow a symlink and attach a host file to container stdio, then change that file's ownership. Affected versions are crun 1.29.1 and earlier. Default configurations that mount a fresh /dev are not exposed. No fixed release is available yet.

Affected products

• Red Hat OpenShift Container Platform 4.18: all versions
• Red Hat Enterprise Linux 10: all versions
• Red Hat Enterprise Linux 8: all versions
• Red Hat Enterprise Linux 9: all versions
• Red Hat Hardened Images: all versions — fixed in 1.30-1.hum1

How to fix

Upgrade to a fixed version: Red Hat Hardened Images 1.30-1.hum1. Check the vendor advisory for mitigations.

References

• https://access.redhat.com/errata/RHSA-2026:71668
• https://access.redhat.com/security/cve/CVE-2026-88265
• https://bugzilla.redhat.com/show_bug.cgi?id=2531224
• https://github.com/containers/crun/

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