ghsa-v49w-m7p6-cj8x
Vulnerability from github
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.
{ "affected": [], "aliases": [ "CVE-2022-49814" ], "database_specific": { "cwe_ids": [], "github_reviewed": false, "github_reviewed_at": null, "nvd_published_at": "2025-05-01T15:16:04Z", "severity": null }, "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nkcm: close race conditions on sk_receive_queue\n\nsk-\u003esk_receive_queue is protected by skb queue lock, but for KCM\nsockets its RX path takes mux-\u003erx_lock to protect more than just\nskb queue. However, kcm_recvmsg() still only grabs the skb queue\nlock, so race conditions still exist.\n\nWe can teach kcm_recvmsg() to grab mux-\u003erx_lock too but this would\nintroduce a potential performance regression as struct kcm_mux can\nbe shared by multiple KCM sockets.\n\nSo we have to enforce skb queue lock in requeue_rx_msgs() and handle\nskb peek case carefully in kcm_wait_data(). Fortunately,\nskb_recv_datagram() already handles it nicely and is widely used by\nother sockets, we can just switch to skb_recv_datagram() after\ngetting rid of the unnecessary sock lock in kcm_recvmsg() and\nkcm_splice_read(). Side note: SOCK_DONE is not used by KCM sockets,\nso it is safe to get rid of this check too.\n\nI ran the original syzbot reproducer for 30 min without seeing any\nissue.", "id": "GHSA-v49w-m7p6-cj8x", "modified": "2025-05-01T15:31:48Z", "published": "2025-05-01T15:31:48Z", "references": [ { "type": "ADVISORY", "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49814" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/22f6b5d47396b4287662668ee3f5c1f766cb4259" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/4154b6afa2bd639214ff259d912faad984f7413a" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/5121197ecc5db58c07da95eb1ff82b98b121a221" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/bf92e54597d842da127c59833b365d6faeeaf020" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/ce57d6474ae999a3b2d442314087473a646a65c7" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/d9ad4de92e184b19bcae4da10dac0275abf83931" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/f7b0e95071bb4be4b811af3f0bfc3e200eedeaa3" } ], "schema_version": "1.4.0", "severity": [] }
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