Linux Kernel Race Condition (CVE‑2016‑5195 “Dirty COW”) Enables Local Privilege Escalation
What It Is – A race‑condition bug in mm/gup.c of the Linux kernel permits an unprivileged local user to write to read‑only memory, effectively granting root privileges.
Exploitability – Public exploit code exists and works against unpatched kernels from 2.6.22 through 4.9 (and later releases). CVSS v3.0 base score 7.8 (High).
Affected Products – All Linux distributions shipping the vulnerable kernel versions, including Ubuntu, Debian, Red Hat, SUSE, and cloud‑hosted Linux instances.
Why It Matters for Trust & Control Assurance
- Demonstrates the need for continuous patch management as a core control evidence point for auditors.
- Highlights gaps in identity and access controls; a local privilege escalation bypasses OS‑level separation of duties.
- Reinforces the importance of real‑time monitoring to capture anomalous privilege‑escalation activity for a defensible audit trail.
Recommended Actions
- Verify kernel version on all Linux assets; apply the latest security patches immediately.
- Enable automated patch‑management tools and maintain an inventory of kernel versions for continuous compliance evidence.
- Deploy host‑based intrusion detection to alert on suspicious
dirty_cow‑style activity. - Document the remediation steps in your control‑assessment repository to support audit readiness.
Source: CISA KEV – CVE‑2016‑5195