vulnerability
Ubuntu: (CVE-2022-49814): linux vulnerability
Severity | CVSS | Published | Added | Modified |
---|---|---|---|---|
4 | (AV:L/AC:M/Au:S/C:N/I:N/A:C) | May 1, 2025 | May 6, 2025 | Jun 12, 2025 |
Description
In the Linux kernel, the following vulnerability has been resolved:
kcm: close race conditions on sk_receive_queue
sk->sk_receive_queue is protected by skb queue lock, but for KCM
sockets its RX path takes mux->rx_lock to protect more than just
skb queue. However, kcm_recvmsg() still only grabs the skb queue
lock, so race conditions still exist.
We can teach kcm_recvmsg() to grab mux->rx_lock too but this would
introduce a potential performance regression as struct kcm_mux can
be shared by multiple KCM sockets.
So we have to enforce skb queue lock in requeue_rx_msgs() and handle
skb peek case carefully in kcm_wait_data(). Fortunately,
skb_recv_datagram() already handles it nicely and is widely used by
other sockets, we can just switch to skb_recv_datagram() after
getting rid of the unnecessary sock lock in kcm_recvmsg() and
kcm_splice_read(). Side note: SOCK_DONE is not used by KCM sockets,
so it is safe to get rid of this check too.
I ran the original syzbot reproducer for 30 min without seeing any
issue.
Solution(s)
References
- CVE-2022-49814
- https://attackerkb.com/topics/CVE-2022-49814
- URL-https://git.kernel.org/linus/5121197ecc5db58c07da95eb1ff82b98b121a221
- URL-https://git.kernel.org/stable/c/22f6b5d47396b4287662668ee3f5c1f766cb4259
- URL-https://git.kernel.org/stable/c/4154b6afa2bd639214ff259d912faad984f7413a
- URL-https://git.kernel.org/stable/c/5121197ecc5db58c07da95eb1ff82b98b121a221
- URL-https://git.kernel.org/stable/c/bf92e54597d842da127c59833b365d6faeeaf020
- URL-https://git.kernel.org/stable/c/ce57d6474ae999a3b2d442314087473a646a65c7
- URL-https://git.kernel.org/stable/c/d9ad4de92e184b19bcae4da10dac0275abf83931
- URL-https://git.kernel.org/stable/c/f7b0e95071bb4be4b811af3f0bfc3e200eedeaa3
- URL-https://www.cve.org/CVERecord?id=CVE-2022-49814

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