CVE-2026-74724

Description

In the Linux kernel, the following vulnerability has been resolved: ipvs: avoid out-of-bounds write in ip_vs_nat_icmp Sashiko warns that local attacker can modify the packet while it is processed by IPVS. Some places read the IP ihl field multiple times which can cause out-of-bounds access. One such place is ip_vs_nat_icmp where we can write after the validated area. Fix it by providing ciph argument just like it is done for IPv6 and use ciph->len as offset to the embedded transport header. Modify some IPv4 header checks by reading the ihl field only once.

References

• https://git.kernel.org/stable/c/243d0187ec4c3837b9b0004f18d1068e46115760
• https://git.kernel.org/stable/c/3b8f79af0e98f27b932b0b416e9c52b692d31ff9
• https://git.kernel.org/stable/c/3c779b258c9c3c3567af68d4f45c2f751f35bd0e
• https://git.kernel.org/stable/c/646922a0379496154e8c8faca4f8e2fd9100cacc
• https://git.kernel.org/stable/c/a69a4b3fff5814d079beff9a1e9d369994b2ed47