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Vulnerability · Published Sep 10, 2026 · Assigned by redhat

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

Medium 5.6

In plain English

A medium-severity security flaw in Red Hat Enterprise Linux 10 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 2% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.6Medium
Exploit odds (30 days)0.1%top 98.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.24crun1.30.1-r0ALPINE-CVE-2026-88265
Debian:12crunno fix listedDEBIAN-CVE-2026-88265
Debian:13crunno fix listedDEBIAN-CVE-2026-88265
Debian:14crunno fix listedDEBIAN-CVE-2026-88265
Ubuntu:22.04:LTScrunno fix listedUBUNTU-CVE-2026-88265
Ubuntu:24.04:LTScrunno fix listedUBUNTU-CVE-2026-88265
Ubuntu:26.04:LTScrunno fix listedUBUNTU-CVE-2026-88265
Ubuntu:26.10crunno fix listedUBUNTU-CVE-2026-88265

Affected products (as reported)

VendorProductVersions
Red Hat Red Hat Hardened Images see references
Red Hat Red Hat Enterprise Linux 10 see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 9 see references
Red Hat Red Hat OpenShift Container Platform 4 see references
Red Hat Red Hat OpenShift Container Platform 4 see references
Red Hat Red Hat OpenShift Container Platform 4 see references

Weakness: CWE-59 · Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:N

References