www.akamai.com Critical Linux Kernel Flaw CVE-2026-99999 Requires Immediate Patching
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- •CVE-2026-99999 is a critical Linux kernel vulnerability with a CVSS score of 9.3.
- •Patching is urgent for multi-tenant hosts, especially those running VMs or containers.
- •No public exploits exist yet, but the researcher anticipates they will emerge soon.
CVE-2026-99999, known as PwnEscape, is a critical Linux kernel vulnerability affecting all common distributions since 2008. It allows a guest virtual machine to escape and attack the host, potentially leading to memory leaks and code execution as root. The flaw was disclosed on October 15, 2026, and has a CVSS score of 9.3. While patches have been released by Red Hat, AlmaLinux, and Debian, Ubuntu has not yet provided a fix. The vulnerability cannot be exploited remotely alone; an attacker must have access to a guest VM or container. Akamai has patched its hypervisors, but the risk remains for multi-tenant environments. The researcher expects exploits to emerge within weeks. Currently, no public exploits have been reported, and CISA has not listed it in the KEV catalog.
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