Crun: crun: /dev/null symlink follow during stdio reopen allows host bind-mount write and chown
Summary
| CVE | CVE-2026-88265 |
|---|---|
| State | PUBLISHED |
| Assigner | redhat |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-09-10 09:17:03 UTC |
| Updated | 2026-09-10 18:18:14 UTC |
| 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. |
Risk And Classification
Primary CVSS: v3.1 5.6 MEDIUM from [email protected]
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:N
EPSS: 0.001190000 probability, percentile 0.020070000 (date 2026-09-10)
Problem Types: CWE-59 | CWE-59 Improper Link Resolution Before File Access ('Link Following')
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Secondary | 5.6 | MEDIUM | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:N |
| 3.1 | CNA | CVSS | 5.6 | MEDIUM | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:N |
CVSS v3.1 Breakdown
Attack Vector
LocalAttack Complexity
HighPrivileges Required
LowUser Interaction
NoneScope
ChangedConfidentiality
NoneIntegrity
HighAvailability
NoneCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:N
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Red Hat | Red Hat Hardened Images | Not specified | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| github.com/containers/crun | [email protected] | github.com | |
| access.redhat.com/security/cve/CVE-2026-88265 | [email protected] | access.redhat.com | |
| bugzilla.redhat.com/show_bug.cgi | [email protected] | bugzilla.redhat.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| CNA | 2026-09-09T16:44:11.725Z | Reported to Red Hat. |
| CNA | 2026-09-09T00:00:00.000Z | Made public. |
Workarounds
CNA: 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.
There are currently no legacy QID mappings associated with this CVE.