Medium [CVE-2026-88265] /dev/null symlink follow during stdio reopen allows host bind-mount write and chown
This medium-severity Red Hat Linux advisory covers CVE-2026-88265 affecting Red Hat Hardened Images.
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Summary
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. This Moderate flaw in crun allows a non-root container process to write to and change ownership of a host bind-mounted file.
Exploitation requires a malicious container image to replace /dev/null with a symlink while /dev is not mounted within the container, indicating specific preconditions for successful attack. Red Hat severity: Moderate — CVSS 5.6 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:N).
Weakness: CWE-59. Affected Red Hat products: Red Hat Hardened Images.
Red Hat does not currently list a fixing RHSA for this CVE.
- 1.29.1
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
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