CVE-2022-49561: Linux Kernel

Medium severity, CVSS 5.5. EPSS: 0.8% chance of exploitation in the next 30 days.

In the Linux kernel, the following vulnerability has been resolved: netfilter: conntrack: re-fetch conntrack after insertion In case the conntrack is clashing, insertion can free skb->_nfct and set skb->_nfct to the already-confirmed entry. This wasn't found before because the conntrack entry and the extension space used to free'd after an rcu grace period, plus the race needs events enabled to trigger.

Affected products

• Linux Linux Kernel: from 4.7, before 4.14.282 (fixed in 4.14.282); from 4.15, before 4.19.246 (fixed in 4.19.246); from 4.20, before 5.4.197 (fixed in 5.4.197); from 5.5, before 5.10.120 (fixed in 5.10.120); from 5.11, before 5.15.45 (fixed in 5.15.45); from 5.16, before 5.17.13 (fixed in 5.17.13); …

Published 2025-02-26. Last modified 2026-08-04.