CVE-2023-4622

Summary

CVE-2023-4622 is a use-after-free vulnerability affecting the Linux kernel's af_unix component. This issue can be exploited to achieve local privilege escalation. The unix_stream_sendpage() function in the kernel attempts to add data to the last skb (Socket Buffer) in the peer's receive queue without locking it, leading to a race condition. In this race condition, unix_stream_sendpage() may access an skb locklessly while it is being released during garbage collection, resulting in use-after-free. To mitigate this vulnerability, it is recommended to upgrade past commit 790c2f9d15b594350ae9bca7b236f2b1859de02c.

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