CVE-2026-88265
Crun: crun: /dev/null symlink follow during stdio reopen allows host bind-mount write and chown
- State
- Published
- Severity
- 5.6 Medium
- Published
- Sep 10, 2026
- Updated
- Oct 2, 2026
- Reserved
- Sep 10, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 5.6 Medium | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:N | redhat |
Weaknesses
- CWE-59 Improper Link Resolution Before File Access ('Link Following')
Affected Products
| Product | Versions |
|---|---|
Red Hat Hardened ImagesRed Hat |
|
Red Hat Enterprise Linux 10Red Hat | |
Red Hat Enterprise Linux 8Red Hat | |
Red Hat Enterprise Linux 9Red Hat | |
Red Hat OpenShift Container Platform 4Red Hat | |
Red Hat OpenShift Container Platform 4Red Hat | |
Red Hat OpenShift Container Platform 4Red Hat |
References
- RHSA-2026:71668vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-88265vdb-entry
- RHBZ#2531224issue-tracking
- https://github.com/containers/crun/
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