CVE-2026-74724

ipvs: avoid out-of-bounds write in ip_vs_nat_icmp

State: Published
Severity: 7.8 High
Published: Aug 22, 2026
Updated: Oct 16, 2026
Reserved: Aug 15, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 3b8f79af0e98f27b932b0b416e9c52b692d31ff9Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 3c779b258c9c3c3567af68d4f45c2f751f35bd0eAffected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before be65fa324640c7a95e30b146159a2be5cc73f22eAffected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before a69a4b3fff5814d079beff9a1e9d369994b2ed47Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 243d0187ec4c3837b9b0004f18d1068e46115760Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 646922a0379496154e8c8faca4f8e2fd9100caccAffected
LinuxLinux	2.6.12Affected before 2.6.12Not affected 6.1.183 through 6.1.Not affected 6.6.152 through 6.6.Not affected 6.12.104 through 6.12.Not affected 6.18.45 through 6.18.Not affected 7.1.9 through 7.1.*Not affected 7.2 and laterNot affected

Product

Versions

LinuxLinux

1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 3b8f79af0e98f27b932b0b416e9c52b692d31ff9Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 3c779b258c9c3c3567af68d4f45c2f751f35bd0eAffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before be65fa324640c7a95e30b146159a2be5cc73f22eAffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before a69a4b3fff5814d079beff9a1e9d369994b2ed47Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 243d0187ec4c3837b9b0004f18d1068e46115760Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 646922a0379496154e8c8faca4f8e2fd9100caccAffected

LinuxLinux

2.6.12Affected
before 2.6.12Not affected
6.1.183 through 6.1.*Not affected
6.6.152 through 6.6.*Not affected
6.12.104 through 6.12.*Not affected
6.18.45 through 6.18.*Not affected
7.1.9 through 7.1.*Not affected
7.2 and laterNot affected

References

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