THREAT OPS › Threat News › How Cloudflare responded to the “Copy Fail” Linux vulnerability
How Cloudflare responded to the “Copy Fail” Linux vulnerability
<p>On April 29, 2026, a Linux kernel local privilege escalation vulnerability was publicly disclosed under the name "Copy Fail" (<a href="https://security-tracker.debian.org/tracker/CVE-2026-31431"><span style="text-decoration: underline;">CVE-2026-31431</span></a>). Cloudflare’s Security and Engineering teams began assessing the vulnerability as soon as it was disclosed. We reviewed the
MITRE ATT&CK techniques
- VulnerabilitiesT1588.006
Indicators of compromise
- CVE-2026-31431cve
- https://security-tracker.debian.org/tracker/CVE-2026-31431url
- https://xint.io/blog/copy-fail-linux-distributionsurl
- https://copy.fail/url