runc is a CLI tool for spawning and running containers according to the OCI specification. Versions 1.0.0-rc3 through 1.2.7, 1.3.0-rc.1 through 1.3.2, and 1.4.0-rc.1 through 1.4.0-rc.2, due to insufficient checks when bind-mounting `/dev/pts/$n` to `/dev/console` inside the container, an attacker can trick runc into bind-mounting paths which would normally be made read-only or be masked onto a path that the attacker can write to. This attack is very similar in concept and application to CVE-2025-31133, except that it attacks a similar vulnerability in a different target (namely, the bind-mount of `/dev/pts/$n` to `/dev/console` as configured for all containers that allocate a console). This happens after `pivot_root(2)`, so this cannot be used to write to host files directly -- however, as with CVE-2025-31133, this can load to denial of service of the host or a container breakout by providing the attacker with a writable copy of `/proc/sysrq-trigger` or `/proc/sys/kernel/core_pattern` (respectively). This issue is fixed in versions 1.2.8, 1.3.3 and 1.4.0-rc.3.
2025-11-06T20:15:49.240
2025-12-03T18:33:33.357
Analyzed
CVSSv3.1: 7.5 (HIGH)
| Type | Vendor | Product | Version/Range | Vulnerable? |
|---|---|---|---|---|
| Application | linuxfoundation | runc | < 1.2.8 | Yes |
| Application | linuxfoundation | runc | < 1.3.3 | Yes |
| Application | linuxfoundation | runc | 1.0.0 | Yes |
| Application | linuxfoundation | runc | 1.0.0 | Yes |
| Application | linuxfoundation | runc | 1.0.0 | Yes |
| Application | linuxfoundation | runc | 1.0.0 | Yes |
| Application | linuxfoundation | runc | 1.0.0 | Yes |
| Application | linuxfoundation | runc | 1.0.0 | Yes |
| Application | linuxfoundation | runc | 1.0.0 | Yes |
| Application | linuxfoundation | runc | 1.0.0 | Yes |
| Application | linuxfoundation | runc | 1.0.0 | Yes |
| Application | linuxfoundation | runc | 1.0.0 | Yes |
| Application | linuxfoundation | runc | 1.0.0 | Yes |
| Application | linuxfoundation | runc | 1.0.0 | Yes |
| Application | linuxfoundation | runc | 1.0.0 | Yes |
| Application | linuxfoundation | runc | 1.4.0 | Yes |
| Application | linuxfoundation | runc | 1.4.0 | Yes |