{"id":"CVE-2024-26615","summary":"net/smc: fix illegal rmb_desc access in SMC-D connection dump","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: fix illegal rmb_desc access in SMC-D connection dump\n\nA crash was found when dumping SMC-D connections. It can be reproduced\nby following steps:\n\n- run nginx/wrk test:\n  smc_run nginx\n  smc_run wrk -t 16 -c 1000 -d \u003cduration\u003e -H 'Connection: Close' \u003cURL\u003e\n\n- continuously dump SMC-D connections in parallel:\n  watch -n 1 'smcss -D'\n\n BUG: kernel NULL pointer dereference, address: 0000000000000030\n CPU: 2 PID: 7204 Comm: smcss Kdump: loaded Tainted: G\tE      6.7.0+ #55\n RIP: 0010:__smc_diag_dump.constprop.0+0x5e5/0x620 [smc_diag]\n Call Trace:\n  \u003cTASK\u003e\n  ? __die+0x24/0x70\n  ? page_fault_oops+0x66/0x150\n  ? exc_page_fault+0x69/0x140\n  ? asm_exc_page_fault+0x26/0x30\n  ? __smc_diag_dump.constprop.0+0x5e5/0x620 [smc_diag]\n  ? __kmalloc_node_track_caller+0x35d/0x430\n  ? __alloc_skb+0x77/0x170\n  smc_diag_dump_proto+0xd0/0xf0 [smc_diag]\n  smc_diag_dump+0x26/0x60 [smc_diag]\n  netlink_dump+0x19f/0x320\n  __netlink_dump_start+0x1dc/0x300\n  smc_diag_handler_dump+0x6a/0x80 [smc_diag]\n  ? __pfx_smc_diag_dump+0x10/0x10 [smc_diag]\n  sock_diag_rcv_msg+0x121/0x140\n  ? __pfx_sock_diag_rcv_msg+0x10/0x10\n  netlink_rcv_skb+0x5a/0x110\n  sock_diag_rcv+0x28/0x40\n  netlink_unicast+0x22a/0x330\n  netlink_sendmsg+0x1f8/0x420\n  __sock_sendmsg+0xb0/0xc0\n  ____sys_sendmsg+0x24e/0x300\n  ? copy_msghdr_from_user+0x62/0x80\n  ___sys_sendmsg+0x7c/0xd0\n  ? __do_fault+0x34/0x160\n  ? do_read_fault+0x5f/0x100\n  ? do_fault+0xb0/0x110\n  ? __handle_mm_fault+0x2b0/0x6c0\n  __sys_sendmsg+0x4d/0x80\n  do_syscall_64+0x69/0x180\n  entry_SYSCALL_64_after_hwframe+0x6e/0x76\n\nIt is possible that the connection is in process of being established\nwhen we dump it. Assumed that the connection has been registered in a\nlink group by smc_conn_create() but the rmb_desc has not yet been\ninitialized by smc_buf_create(), thus causing the illegal access to\nconn-\u003ermb_desc. So fix it by checking before dump.","modified":"2026-04-02T10:05:02.215202Z","published":"2024-02-29T15:52:18.843Z","related":["ALSA-2024:10939","ALSA-2024:3618","ALSA-2024:3627","SUSE-SU-2024:2802-1","SUSE-SU-2024:2892-1","SUSE-SU-2024:2894-1","SUSE-SU-2024:2896-1","SUSE-SU-2024:2901-1","SUSE-SU-2024:2939-1","SUSE-SU-2024:2940-1","SUSE-SU-2024:2947-1","SUSE-SU-2024:2973-1","SUSE-SU-2025:20008-1","SUSE-SU-2025:20028-1","USN-6818-2","USN-6819-2"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/26xxx/CVE-2024-26615.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/1fea9969b81c67d0cb1611d1b8b7d19049d937be"},{"type":"WEB","url":"https://git.kernel.org/stable/c/27aea64838914c6122db5b8bd4bed865c9736f22"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5fed92ca32eafbfae8b6bee8ca34cca71c6a8b6d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/68b888d51ac82f2b96bf5e077a31d76afcdef25a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6994dba06321e3c48fdad0ba796a063d9d82183a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8f3f9186e5bb96a9c9654c41653210e3ea7e48a6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a164c2922675d7051805cdaf2b07daffe44f20d9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/dbc153fd3c142909e564bb256da087e13fbf239c"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/26xxx/CVE-2024-26615.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-26615"},{"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":"4b1b7d3b30a6d32ac1a1dcede284e76ef8a8542d"},{"fixed":"27aea64838914c6122db5b8bd4bed865c9736f22"},{"fixed":"1fea9969b81c67d0cb1611d1b8b7d19049d937be"},{"fixed":"5fed92ca32eafbfae8b6bee8ca34cca71c6a8b6d"},{"fixed":"68b888d51ac82f2b96bf5e077a31d76afcdef25a"},{"fixed":"6994dba06321e3c48fdad0ba796a063d9d82183a"},{"fixed":"a164c2922675d7051805cdaf2b07daffe44f20d9"},{"fixed":"8f3f9186e5bb96a9c9654c41653210e3ea7e48a6"},{"fixed":"dbc153fd3c142909e564bb256da087e13fbf239c"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-26615.json"}}],"schema_version":"1.7.5"}