Linux Kernel Heap‑Based Buffer Overflow (CVE‑2022‑0185) Enables Privilege Escalation
What It Is — A heap‑based buffer overflow in the legacy_parse_param function of the Linux kernel’s Filesystem Context code can be triggered by mounting a specially crafted filesystem that does not implement the Filesystem Context API.
Exploitability — CVSS v3.1 base score 7.8 (High). No public exploit has been released, but the vulnerability is exploitable locally and could be leveraged by an attacker with user‑level access to obtain root privileges.
Affected Products — All Linux distributions shipping kernel versions 5.10 through 5.15 that include the vulnerable legacy_parse_param implementation.
Why It Matters for Trust & Control Assurance
- Access‑control hygiene: Privilege‑escalation flaws directly test an organization’s ability to enforce least‑privilege and separation‑of‑duties controls.
- Continuous evidence: Demonstrating that kernel patches are applied and verified provides audit‑ready evidence of due‑diligence.
- Defensible posture: In regulated environments, showing a documented patch‑management process satisfies multiple framework requirements (e.g., NIST CSF 2.0 Identify & Protect functions).
Recommended Actions
- Identify all assets running an affected kernel version.
- Apply the upstream kernel patches released by the distribution (or upgrade to a fixed version).
- Verify the patch status with a trusted configuration‑management tool and retain evidence for audit.
- Monitor system logs for abnormal filesystem mount attempts that could indicate exploitation attempts.
- Update your vulnerability‑management program to include this CVE in regular scans.
Source: CISA KEV – CVE‑2022‑0185