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CVE-2026-98078: ipvs: fix reversed sequence option serialization

• Severity: medium (CVSS 4.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-25 · updated 2026-10-19
• Weakness: CWE-125

Description

In the Linux kernel, the following vulnerability has been resolved: ipvs: fix reversed sequence option serialization hton_seq() expects the host-order source first and the unaligned network-order destination second. The version 1 sync sender passes these arguments in reverse for both sequence blocks. This leaves 24 bytes of the kmalloc-backed message unwritten. It may disclose stale heap data and replace the live connection sequence state with values read from the buffer. Pass the connection sequence state as the source and the message payload as the destination for both blocks.

Affected products

• Linux kernel: from 2.6.39 before 6.12.111; from 6.13 before 6.18.53; from 6.19 before 7.2.7; 7.3-rc1, 7.3-rc2 — fixed in 6.12.111, 6.18.53, 7.2.7

How to fix

Upgrade to a fixed version: Linux kernel 6.12.111, 6.18.53, 7.2.7. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/524599714558da83747c04952d378155c69f5b6b
• https://git.kernel.org/stable/c/677ff8ab30a663cde984d8afe86465fd0d81aeef
• https://git.kernel.org/stable/c/ae38b2ae16f709c0193e1b4340bde26ef3e2687d
• https://git.kernel.org/stable/c/b04578b74f2d3755548fe9e829e3b2a6c6f966a1
• https://git.kernel.org/stable/c/bbc68ba258a4eb0a2ca3b3a105550801aa8b00b0
• https://git.kernel.org/stable/c/de6cc6ec7932bc530f2bb92005dac9123d50659c
• https://git.kernel.org/stable/c/e1c9f9446d3eaae323f1689f9e5de3b1ad6e47ec
• https://git.kernel.org/stable/c/f487b5788f15c6c32a219ed1480d25c93fc18d30

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