runc is a CLI tool for spawning and running containers on Linux according to the OCI specification. In runc 1.1.11 and earlier, due to an internal file descriptor leak, an attacker could cause a newly-spawned container process (from runc exec) to have a working directory in the host filesystem namespace, allowing for a container escape by giving access to the host filesystem ("attack 2"). The same attack could be used by a malicious image to allow a container process to gain access to the host filesystem through runc run ("attack 1"). Variants of attacks 1 and 2 could be also be used to overwrite semi-arbitrary host binaries, allowing for complete container escapes ("attack 3a" and "attack 3b"). runc 1.1.12 includes patches for this issue.

Published: 2024-01-31

CVSS: 8.6

CVSS Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Download Exploit for CVE-2024-21626 here:

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Check our team here:

https://tatramed.sk/exploit-1109-cve-2023-28539/

https://tatramed.sk/exploit-12-cve-2024-0057/

https://tatramed.sk/exploit-598-cve-2025-58457/

https://tatramed.sk/exploit-334-cve-2025-27533/