CVE-2024-27390: Linux Kernel

Medium severity, CVSS 5.5. EPSS: 0.2% chance of exploitation in the next 30 days.

In the Linux kernel, the following vulnerability has been resolved: ipv6: mcast: remove one synchronize_net() barrier in ipv6_mc_down() As discussed in the past (commit 2d3916f31891 ("ipv6: fix skb drops in igmp6_event_query() and igmp6_event_report()")) I think the synchronize_net() call in ipv6_mc_down() is not needed. Under load, synchronize_net() can last between 200 usec and 5 ms. KASAN seems to agree as well.

Affected products

• Linux Linux Kernel: from 5.13, before 5.15.153 (fixed in 5.15.153); from 5.16, before 6.1.83 (fixed in 6.1.83); from 6.2, before 6.6.23 (fixed in 6.6.23); from 6.7, before 6.7.11 (fixed in 6.7.11); from 6.8, before 6.8.2 (fixed in 6.8.2)

Published 2024-05-01. Last modified 2026-07-24.