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.
How to fix
- Linux Linux3b8f79af0e98f27b932b0b416e9c52b692d31ff9, 3c779b258c9c3c3567af68d4f45c2f751f35bd0e, be65fa324640c7a95e30b146159a2be5cc73f22e, a69a4b3fff5814d079beff9a1e9d369994b2ed47, 243d0187ec4c3837b9b0004f18d1068e46115760, 646922a0379496154e8c8faca4f8e2fd9100cacc or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ≤ v < 3b8f79af0e98f27b932b0b416e9c52b692d31ff9, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ≤ v < 3c779b258c9c3c3567af68d4f45c2f751f35bd0e, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ≤ v < be65fa324640c7a95e30b146159a2be5cc73f22e, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ≤ v < a69a4b3fff5814d079beff9a1e9d369994b2ed47, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ≤ v < 243d0187ec4c3837b9b0004f18d1068e46115760, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ≤ v < 646922a0379496154e8c8faca4f8e2fd9100cacc, 2.6.12 | 3b8f79af0e98f27b932b0b416e9c52b692d31ff9, 3c779b258c9c3c3567af68d4f45c2f751f35bd0e, be65fa324640c7a95e30b146159a2be5cc73f22e, a69a4b3fff5814d079beff9a1e9d369994b2ed47, 243d0187ec4c3837b9b0004f18d1068e46115760, 646922a0379496154e8c8faca4f8e2fd9100cacc |
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