CVE-2026-74724

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 3b8f79af0e98f27b932b0b416e9c52b692d31ff9affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 3c779b258c9c3c3567af68d4f45c2f751f35bd0eaffected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < be65fa324640c7a95e30b146159a2be5cc73f22eaffected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < a69a4b3fff5814d079beff9a1e9d369994b2ed47affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 243d0187ec4c3837b9b0004f18d1068e46115760affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 646922a0379496154e8c8faca4f8e2fd9100caccaffected
LinuxLinux2.6.12affected
LinuxLinux0 < 2.6.12unaffected
LinuxLinux6.1.183 <= 6.1.*unaffected
LinuxLinux6.6.152 <= 6.6.*unaffected
LinuxLinux6.12.104 <= 6.12.*unaffected
LinuxLinux6.18.45 <= 6.18.*unaffected
LinuxLinux7.1.9 <= 7.1.*unaffected
LinuxLinux7.2 <= *unaffected

Weaknesses

References