CVE-2026-62840: Linux Kernel Elevation of Privilege Vulnerability
Linux Kernel Elevation of Privilege Vulnerability. Microsoft rates it Critical; not reported as exploited; not publicly disclosed; exploitability assessment: Exploitation Less Likely. Microsoft publishes a customer-installable fix (see the release notes linked in the advisory).
What you should do
If you run the affected products, install Microsoft's update (see the release notes linked in the advisory); the advisory lists the exact build per product. from Microsoft's advisory data
Why: Microsoft lists a customer-installable fix, so it matters if you run the affected products.
Details
Original Microsoft text
Time-of-check time-of-use (toctou) race condition in Linux Kernel allows an authorized attacker to elevate privileges locally.
- Severity
- Critical
- Type
- Security updates
- Tags
- Linux Kernel, Elevation of Privilege, 2026-Oct
- Microsoft advisory data
- Customer action required: Yes · Exploited: No · Publicly disclosed: No · Exploitation Less Likely · Remediation: update published
- Classification
- Derived from Microsoft's structured advisory fields, not by AI. Severity (Critical) is Microsoft's rating and is not treated as proof that action is needed.