CVE-2024-36286

Name of the Vulnerable Software and Affected Versions Linux kernel versions prior to 6.6.37

Description A vulnerability has been resolved in the Linux kernel related to netfilter: nfnetlink queue, where the function nf reinject() could be called without acquiring rcu read lock(), leading to suspicious RCU usage. This issue was reported by syzbot and is associated with a WARNING message regarding suspicious RCU usage. The vulnerability is related to the instance destroy rcu() function and involves the nfqnl flush() and nfqnl reinject() functions. Technical details include the involvement of rcu lock acquire, rcu do batch, and rcu core functions, as well as spin lock bh and lockdep rcu suspicious functions.

Recommendations To resolve this issue, update the Linux kernel to version 6.6.37 or later. As a temporary workaround, consider restricting access to the nfnetlink queue module to minimize the risk of exploitation until a patch is available.