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.
| Software | From | Fixed in |
|---|---|---|
github.com/opencontainers/runc
|
1.0.0-rc3 | 1.2.8 |
github.com/opencontainers/runc
|
1.3.0-rc.1 | 1.3.3 |
github.com/opencontainers/runc
|
1.4.0-rc.1 | 1.4.0-rc.3 |
| linuxfoundation / runc | 1.0.1 | 1.2.8 |
| linuxfoundation / runc | 1.3.0 | 1.3.3 |
| linuxfoundation / runc | 1.0.0-rc3 | 1.0.0-rc3.x |
| linuxfoundation / runc | 1.0.0-rc4 | 1.0.0-rc4.x |
| linuxfoundation / runc | 1.0.0-rc5 | 1.0.0-rc5.x |
| linuxfoundation / runc | 1.0.0-rc6 | 1.0.0-rc6.x |
| linuxfoundation / runc | 1.0.0-rc7 | 1.0.0-rc7.x |
| linuxfoundation / runc | 1.0.0-rc8 | 1.0.0-rc8.x |
| linuxfoundation / runc | 1.0.0-rc9 | 1.0.0-rc9.x |
| linuxfoundation / runc | 1.0.0-rc90 | 1.0.0-rc90.x |
| linuxfoundation / runc | 1.0.0-rc91 | 1.0.0-rc91.x |
| linuxfoundation / runc | 1.0.0-rc92 | 1.0.0-rc92.x |
| linuxfoundation / runc | 1.0.0-rc93 | 1.0.0-rc93.x |
| linuxfoundation / runc | 1.0.0-rc94 | 1.0.0-rc94.x |
| linuxfoundation / runc | 1.0.0-rc95 | 1.0.0-rc95.x |
| linuxfoundation / runc | 1.4.0-rc1 | 1.4.0-rc1.x |
| linuxfoundation / runc | 1.4.0-rc2 | 1.4.0-rc2.x |
A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.
CVSS (Common Vulnerability Scoring System) estimates technical severity, but it doesn't automatically equal business risk. Prioritize using context like internet exposure, affected asset criticality, known exploitation (proof-of-concept or in-the-wild), and whether compensating controls exist. A "Medium" CVSS on an exposed, production system can be more urgent than a "Critical" on an isolated, non-production host.
A vulnerability is the underlying weakness. An exploit is the method or code used to take advantage of it. A zero-day is a vulnerability that is unknown to the vendor or has no publicly available fix when attackers begin using it. In practice, risk increases sharply when exploitation becomes reliable or widespread.
Recurring findings usually come from incomplete Asset Discovery, inconsistent patch management, inherited images, and configuration drift. In modern environments, you also need to watch the software supply chain: dependencies, containers, build pipelines, and third-party services can reintroduce the same weakness even after you patch a single host. Unknown or unmanaged assets (often called Shadow IT) are a common reason the same issues resurface.
Use a simple, repeatable triage model: focus first on externally exposed assets, high-value systems (identity, VPN, email, production), vulnerabilities with known exploits, and issues that enable remote code execution or privilege escalation. Then enforce patch SLAs and track progress using consistent metrics so remediation is steady, not reactive.
SynScan combines attack surface monitoring and continuous security auditing to keep your inventory current, flag high-impact vulnerabilities early, and help you turn raw findings into a practical remediation plan.