CVE-2024-26910: Linux Kernel

Medium severity, CVSS 4.7. EPSS: 0.2% chance of exploitation in the next 30 days.

In the Linux kernel, the following vulnerability has been resolved: netfilter: ipset: fix performance regression in swap operation The patch "netfilter: ipset: fix race condition between swap/destroy and kernel side add/del/test", commit 28628fa9 fixes a race condition. But the synchronize_rcu() added to the swap function unnecessarily slows it down: it can safely be moved to destroy and use call_rcu() instead. Eric Dumazet pointed out that simply calling the destroy functions as rcu callback does not work: sets with timeout use garbage collectors which need cancelling at destroy which can wait. Therefore the destroy functions are split into two: cancelling garbage collectors safely at executing the command received by netlink and moving the remaining part only into the rcu callback.

Affected products

• Linux Linux Kernel: before 5.4.269 (fixed in 5.4.269); from 5.5, before 5.10.210 (fixed in 5.10.210); from 5.11, before 5.15.149 (fixed in 5.15.149); from 5.16, before 6.1.79 (fixed in 6.1.79); from 6.2, before 6.6.18 (fixed in 6.6.18); from 6.7, before 6.7.6 (fixed in 6.7.6)

Published 2024-04-17. Last modified 2026-06-17.