CVE-2022-49561: netfilter: conntrack: re-fetch conntrack after insertion
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 Software
Event History
Frequently Asked Questions
What is the severity of CVE-2022-49561?
CVE-2022-49561 has been classified with a severity rating that indicates it could potentially allow for privilege escalation due to mishandling of conntrack entries.
How do I fix CVE-2022-49561?
To fix CVE-2022-49561, update your Linux kernel to a version that includes the relevant patches beyond the affected versions.
What versions of the Linux kernel are affected by CVE-2022-49561?
CVE-2022-49561 affects Linux kernel versions from 4.7 to 5.18.2, excluding patched releases.
What is the impact of CVE-2022-49561 on Linux systems?
CVE-2022-49561 may lead to improper handling of network packets, potentially allowing attackers to bypass security mechanisms.
Has CVE-2022-49561 been resolved?
Yes, CVE-2022-49561 has been resolved in subsequent kernel releases where the vulnerability has been patched.