Linux Kernel IPVS Out-of-Bounds Write in ip_vs_nat_icmp
CVE-2026-74724 Published on August 22, 2026
ipvs: avoid out-of-bounds write in ip_vs_nat_icmp
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.
Products Associated with CVE-2026-74724
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Affected Versions
Linux:- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 3b8f79af0e98f27b932b0b416e9c52b692d31ff9 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 3c779b258c9c3c3567af68d4f45c2f751f35bd0e is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below be65fa324640c7a95e30b146159a2be5cc73f22e is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below a69a4b3fff5814d079beff9a1e9d369994b2ed47 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 243d0187ec4c3837b9b0004f18d1068e46115760 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 646922a0379496154e8c8faca4f8e2fd9100cacc is affected.
- Version 2.6.12 is affected.
- Before 2.6.12 is unaffected.
- Version 6.1.183, <= 6.1.* is unaffected.
- Version 6.6.152, <= 6.6.* is unaffected.
- Version 6.12.104, <= 6.12.* is unaffected.
- Version 6.18.45, <= 6.18.* is unaffected.
- Version 7.1.9, <= 7.1.* is unaffected.
- Version 7.2, <= * is unaffected.