ipvs: fix reversed sequence option serialization

Summary

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.

Timeline

1. Sep 25, 2026, 10:24 AM UTCCVE published
2. Oct 19, 2026, 9:13 AM UTCRecord last updated

Affected versions

• Linux Linux

  From 986a075795339c5ea1122ce9290dfd5504252eb0 · fixed in ae38b2ae16f709c0193e1b4340bde26ef3e2687d; From 986a075795339c5ea1122ce9290dfd5504252eb0 · fixed in bbc68ba258a4eb0a2ca3b3a105550801aa8b00b0; From 986a075795339c5ea1122ce9290dfd5504252eb0 · fixed in f487b5788f15c6c32a219ed1480d25c93fc18d30; From 986a075795339c5ea1122ce9290dfd5504252eb0 · fixed in 677ff8ab30a663cde984d8afe86465fd0d81aeef; From 986a075795339c5ea1122ce9290dfd5504252eb0 · fixed in e1c9f9446d3eaae323f1689f9e5de3b1ad6e47ec; From 986a075795339c5ea1122ce9290dfd5504252eb0 · fixed in 524599714558da83747c04952d378155c69f5b6b; From 986a075795339c5ea1122ce9290dfd5504252eb0 · fixed in de6cc6ec7932bc530f2bb92005dac9123d50659c; From 986a075795339c5ea1122ce9290dfd5504252eb0 · fixed in b04578b74f2d3755548fe9e829e3b2a6c6f966a1

• Linux Linux

  2.6.39

• KernelLinux

  From 2.6.39 · fixed in 5.10.271; From 5.11.0 · fixed in 5.15.222; From 5.16.0 · fixed in 6.1.189; From 6.2.0 · fixed in 6.6.158; From 6.7.0 · fixed in 6.12.111; From 6.13.0 · fixed in 6.18.53; From 6.19.0 · fixed in 7.2.7

References 8