CVE-2022-49697

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix request_sock leak in sk lookup helpers A customer reported a request_socket leak in a Calico cloud environment. We found that a BPF program was doing a socket lookup with takes a refcnt on the socket and that it was finding the request_socket but returning the parent LISTEN socket via sk_to_full_sk() without decrementing the child request socket 1st, resulting in request_sock slab object leak. This patch retains the existing behaviour of returning full socks to the caller but it also decrements the child request_socket if one is present before doing so to prevent the leak. Thanks to Curtis Taylor for all the help in diagnosing and testing this. And thanks to Antoine Tenart for the reproducer and patch input. v2 of this patch contains, refactor as per Daniel Borkmann's suggestions to validate RCU flags on the listen socket so that it balances with bpf_sk_release() and update comments as per Martin KaFai Lau's suggestion. One small change to Daniels suggestion, put "sk = sk2" under "if (sk2 != sk)" to avoid an extra instruction.

The following products are affected by CVE-2022-49697 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2022-49697.

URL	Resource
https://git.kernel.org/stable/c/3046a827316c0e55fc563b4fb78c93b9ca5c7c37
https://git.kernel.org/stable/c/516760f1d2979903eaad5b437256913c5cd98416
https://git.kernel.org/stable/c/5a62b5ba4c0ce8315b6382cd4ace81b48cd121cd
https://git.kernel.org/stable/c/8ffe2e50e9678c8373027492035f094b130437f1
https://git.kernel.org/stable/c/b03607437ea81b850599f705096b05b85e7a4a71
https://lore.kernel.org/linux-cve-announce/2025022628-CVE-2022-49697-db0b@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2022-49697
https://www.cve.org/CVERecord?id=CVE-2022-49697