CVE-2026-46266
A flaw in the Linux kernel lets malicious ICMP packets be processed by raw sockets that use IPPROTO_RAW, potentially causing changes to the kernel’s FNHE cache. The issue has been fixed in the kernel, so updating to a patched version resolves the risk.
An official fix is available, so this entry is kept for 30 days and then removed automatically.
Who is affected
Linux kernel, including all versions such as 2.6.12 and later. Typical users are system administrators and Linux users who run affected kernels.
Real-world impact
An attacker could send crafted ICMP packets that match a raw socket listening on IPPROTO_RAW, leading to changes in the kernel’s FNHE cache. This could affect system stability or performance, potentially causing denial‑of‑service or other disruptions.
Why this severity
The CVSS score of 9.1 reflects that the vulnerability is exploitable over the network, requires no authentication or user interaction, and can compromise both integrity and availability of the system.
What to do about it
- 01Upgrade your Linux kernel to a version that includes the fix for CVE-2026-46266.
- 02Reboot the system to load the new kernel.
NVD-referenced vendor advisory
Timeline
- Jun 3, 2026 · Jun 3, 2026PublishedDisclosed and added to the National Vulnerability Database.
- Jul 22, 2026 · 13d agoAdvisory updatedThe NVD record was last revised.
- Jul 25, 2026 · 10d agoOfficial fix availableA vendor patch or mitigation now exists — see the remediation steps above.