CVE-2026-84042 crun - Privilege Escalation

crun >= 1.29 contains a privilege escalation caused by executing attacker-controlled payload from container image with host root privileges when built with libkrun and rootful passt networking, letting attackers gain host root privileges, exploit requires rootful container with passt networking enabled.

CVSS base score 7.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.10% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Privilege Escalation
Impact
Privilege Escalation, Remote Code Execution
CVSS vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Published
10 September 2026
Updated
15 October 2026
Weakness
CWE-269

Vendor fix

Update to a version later than 1.29 or the latest available version.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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