Medium severity · published Sep 10, 2026
CVE-2026-88265
Crun: crun: /dev/null symlink follow during stdio reopen allows host bind-mount write and chown
5.6
CVSS
0.1%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:N
Attack vector
Local
Complexity
High
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
High
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 2% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RH
Red Hat Enterprise Linux 10 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Enterprise Linux 8 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Enterprise Linux 9 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Hardened Images · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat OpenShift Container Platform 4 · Red Hat
All versions, or not specified · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-88265
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-88265
vendor-advisory
https://access.redhat.com/errata/RHSA-2026:71668
vdb-entry
https://access.redhat.com/security/cve/CVE-2026-88265
issue-tracking
https://bugzilla.redhat.com/show_bug.cgi?id=2531224
github.com
https://github.com/containers/crun/
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