Detections
Analytics
CVE-2026-74747
high
Description
In the Linux kernel, the following vulnerability has been resolved: ipvs: revalidate ihl to prevent out-of-bounds access While the outer IP header is already pulled into the skb head, we must be careful and revalidate the embedded headers after reading them from the skb frags to prevent out-of-bounds access. One such place reported by Sashiko is ip_vs_nat_icmp() where local process can change the ihl field and after skb_ensure_writable() we can see larger value which is a problem for the ip_send_check(cih) calls. Add check to drop the packet if the ihl field is changed.
References
https://git.kernel.org/stable/c/f55bb94946fb8ee6304590a731c39c1fbc3b28bc
https://git.kernel.org/stable/c/eb81c8e758f49e04391f77d9470a6232bb5f1c7a
https://git.kernel.org/stable/c/d93660df4dd1d116f608ada4a29a80a5d6f0a6ed
https://git.kernel.org/stable/c/5365f012451fce2453f13a568dcb72ea534c1e4d
https://git.kernel.org/stable/c/2512289cbf58706fd558e8fccea4e28003a2af54
https://git.kernel.org/stable/c/041b2303c8019394735c1f76c5138657bf660a7d