Vulnerability CVE-2020-36694
Published: 2023-05-21   Modified: 2023-05-22

Description:
An issue was discovered in netfilter in the Linux kernel before 5.10. There can be a use-after-free in the packet processing context, because the per-CPU sequence count is mishandled during concurrent iptables rules replacement. This could be exploited with the CAP_NET_ADMIN capability in an unprivileged namespace. NOTE: cc00bca was reverted in 5.12.

 References:
https://syzkaller.appspot.com/bug?id=0c4fd9c6aa04ec116d01e915d3b186f71a212cb2
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=cc00bcaa589914096edef7fb87ca5cee4a166b5c
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10
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