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Message-ID: <2025050131-CVE-2022-49814-2f30@gregkh> Date: Thu, 1 May 2025 16:10:04 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...nel.org> Subject: CVE-2022-49814: kcm: close race conditions on sk_receive_queue From: Greg Kroah-Hartman <gregkh@...nel.org> 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. The Linux kernel CVE team has assigned CVE-2022-49814 to this issue. Affected and fixed versions =========================== Issue introduced in 4.6 with commit ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 and fixed in 4.14.300 with commit 22f6b5d47396b4287662668ee3f5c1f766cb4259 Issue introduced in 4.6 with commit ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 and fixed in 4.19.267 with commit d9ad4de92e184b19bcae4da10dac0275abf83931 Issue introduced in 4.6 with commit ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 and fixed in 5.4.225 with commit ce57d6474ae999a3b2d442314087473a646a65c7 Issue introduced in 4.6 with commit ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 and fixed in 5.10.156 with commit 4154b6afa2bd639214ff259d912faad984f7413a Issue introduced in 4.6 with commit ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 and fixed in 5.15.80 with commit f7b0e95071bb4be4b811af3f0bfc3e200eedeaa3 Issue introduced in 4.6 with commit ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 and fixed in 6.0.10 with commit bf92e54597d842da127c59833b365d6faeeaf020 Issue introduced in 4.6 with commit ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 and fixed in 6.1 with commit 5121197ecc5db58c07da95eb1ff82b98b121a221 Please see https://www.kernel.org for a full list of currently supported kernel versions by the kernel community. Unaffected versions might change over time as fixes are backported to older supported kernel versions. The official CVE entry at https://cve.org/CVERecord/?id=CVE-2022-49814 will be updated if fixes are backported, please check that for the most up to date information about this issue. Affected files ============== The file(s) affected by this issue are: net/kcm/kcmsock.c Mitigation ========== The Linux kernel CVE team recommends that you update to the latest stable kernel version for this, and many other bugfixes. Individual changes are never tested alone, but rather are part of a larger kernel release. Cherry-picking individual commits is not recommended or supported by the Linux kernel community at all. If however, updating to the latest release is impossible, the individual changes to resolve this issue can be found at these commits: https://git.kernel.org/stable/c/22f6b5d47396b4287662668ee3f5c1f766cb4259 https://git.kernel.org/stable/c/d9ad4de92e184b19bcae4da10dac0275abf83931 https://git.kernel.org/stable/c/ce57d6474ae999a3b2d442314087473a646a65c7 https://git.kernel.org/stable/c/4154b6afa2bd639214ff259d912faad984f7413a https://git.kernel.org/stable/c/f7b0e95071bb4be4b811af3f0bfc3e200eedeaa3 https://git.kernel.org/stable/c/bf92e54597d842da127c59833b365d6faeeaf020 https://git.kernel.org/stable/c/5121197ecc5db58c07da95eb1ff82b98b121a221
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