CVE-2024-21626

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.

Notes