{"id":"CVE-2022-49814","summary":"kcm: close race conditions on sk_receive_queue","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.","modified":"2026-04-02T08:27:57.011179Z","published":"2025-05-01T14:09:38.389Z","related":["SUSE-SU-2025:02334-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49814.json","cna_assigner":"Linux"},"references":[{"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"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49814.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-49814"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"ab7ac4eb9832e32a09f4e8042705484d2fb0aad3"},{"fixed":"22f6b5d47396b4287662668ee3f5c1f766cb4259"},{"fixed":"d9ad4de92e184b19bcae4da10dac0275abf83931"},{"fixed":"ce57d6474ae999a3b2d442314087473a646a65c7"},{"fixed":"4154b6afa2bd639214ff259d912faad984f7413a"},{"fixed":"f7b0e95071bb4be4b811af3f0bfc3e200eedeaa3"},{"fixed":"bf92e54597d842da127c59833b365d6faeeaf020"},{"fixed":"5121197ecc5db58c07da95eb1ff82b98b121a221"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-49814.json"}}],"schema_version":"1.7.5"}