{"id":"CVE-2026-90218","summary":"RDMA/cma: Fix WARNING in res_to_rt","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/cma: Fix WARNING in res_to_rt\n\nsyzbot reported a WARN_ON(!res-\u003edev) in res_to_rt() triggered via\naddr_handler() during asynchronous address resolution:\n\n\"\nWARNING: drivers/infiniband/core/restrack.c:138 at res_to_rt+0x1c4/0x230\nCPU#1: kworker/u8:4/59\nModules linked in:\nCPU: 1 UID: 0 PID: 59 Comm: kworker/u8:4 Not tainted syzkaller #0 PREEMPT(full)\nHardware name: Google Compute Engine, BIOS Google 07/24/2026\nWorkqueue: ib_addr process_one_req\nRIP: 0010:res_to_rt+0x1c4/0x230 drivers/infiniband/core/restrack.c:138\nRSP: 0018:ffffc9000201f850 EFLAGS: 00010293\nRAX: ffffffff88d00ce5 RBX: ffff88807f0fd4f8 RCX: ffff88801e6e0000\nRDX: 0000000000000000 RSI: ffffffff8fd996f0 RDI: 0000000000000003\nRBP: 0000000000000000 R08: ffff88801e6e0000 R09: 000000000000000a\nR10: 0000000000000009 R11: 0000000000000000 R12: dffffc0000000000\nR13: 1ffff1100fe1fa9f R14: 0000000000000000 R15: 0000000000000003\nFS:  0000000000000000(0000) GS:ffff888125012000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00001d559c3d2000 CR3: 0000000077c4c000 CR4: 00000000003526f0\nCall Trace:\n \u003cTASK\u003e\n rdma_restrack_add+0x5a/0x8a0 drivers/infiniband/core/restrack.c:236\n addr_handler+0x41a/0x5a0 drivers/infiniband/core/cma.c:3534\n process_one_req+0x2eb/0x540 drivers/infiniband/core/addr.c:624\n process_one_work kernel/workqueue.c:3375 [inline]\n process_scheduled_works+0xc4e/0x1630 kernel/workqueue.c:3458\n worker_thread+0xa47/0xfb0 kernel/workqueue.c:3539\n kthread+0x388/0x470 kernel/kthread.c:436\n ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158\n ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245\n \u003c/TASK\u003e\n\"\n\nIn addr_handler(), cma_acquire_dev_by_src_ip() is called to populate\nid_priv-\u003ecma_dev and bind the associated ib_device to id_priv-\u003eid.device.\nIf cma_acquire_dev_by_src_ip() returns an error (non-zero status), the ID\nremains unassociated with any RDMA device.\n\nPreviously, rdma_restrack_add(&id_priv-\u003eres) was invoked unconditionally\neven when cma_acquire_dev_by_src_ip() failed, passing a resource with a\nNULL dev pointer and triggering the WARN_ON assertion in res_to_rt().\n\nFix this by only adding the resource to restrack when acquiring the device\nsucceeds.","modified":"2026-09-18T03:48:36.546036053Z","published":"2026-09-17T16:07:30.076Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90218.json"},"references":[{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"},{"type":"WEB","url":"https://git.kernel.org/stable/c/1d7e55ea64dd15769318ba2e0fe0956db82ba3c3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2a63cb9ea862ac7d947952b497eef6520853538c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/39e83bb77fc92344cd62a373b311f096d812e548"},{"type":"WEB","url":"https://git.kernel.org/stable/c/544e40805dbb6cfe64916bd4c8b238fec585ac2a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/64a2bd4cfc16c24f0a0e6321a2fd00ffde3e0a5b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9c80273d663959504957606b9a24fe901ee2a4a1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c6d1ec4fbe56492bb88987d577f04a5fb6955f26"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f72957e0b31f2962f4c1089a9223f1206aa26983"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90218.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90218"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"c5ebaca402f5c5bd61ac8316feb2aa3a0be4d4a8"},{"fixed":"1d7e55ea64dd15769318ba2e0fe0956db82ba3c3"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"cb5cd0ea4eb3ce338a593a5331ddb4986ae20faa"},{"fixed":"39e83bb77fc92344cd62a373b311f096d812e548"},{"fixed":"9c80273d663959504957606b9a24fe901ee2a4a1"},{"fixed":"2a63cb9ea862ac7d947952b497eef6520853538c"},{"fixed":"f72957e0b31f2962f4c1089a9223f1206aa26983"},{"fixed":"544e40805dbb6cfe64916bd4c8b238fec585ac2a"},{"fixed":"64a2bd4cfc16c24f0a0e6321a2fd00ffde3e0a5b"},{"fixed":"c6d1ec4fbe56492bb88987d577f04a5fb6955f26"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"073fdf539d4c022162db3d77a5afca1710f0de2d"},{"last_affected":"fa37a461bd6d9ee86e891ba3e4074a450e44c881"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.10.37"},{"fixed":"5.10.270"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.11.21"},{"fixed":"5.12"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.12.4"},{"fixed":"5.13"}]}],"versions":["v5.10.269","v5.10.268","v5.10.267","v5.10.266","v5.10.265","v5.10.264","v5.10.263","v5.10.262","v5.10.261","v5.10.260","v5.10.259","v5.10.258","v5.10.257","v5.10.256","v5.10.255","v5.10.254","v5.10.253","v5.10.252","v5.10.251","v5.10.250","v5.10.249","v5.10.248","v5.10.247","v5.10.246","v5.10.245","v5.10.244","v5.10.243","v5.10.242","v5.10.241","v5.10.240","v5.10.239","v5.10.238","v5.10.237","v5.10.236","v5.10.235","v5.10.234","v5.10.233","v5.10.232","v5.10.231","v5.10.230","v5.10.229","v5.10.228","v5.10.227","v5.10.226","v5.10.225","v5.10.224","v5.10.223","v5.10.222","v5.10.221","v5.10.220","v5.10.219","v5.10.218","v5.10.217","v5.10.216","v5.10.215","v5.10.214","v5.10.213","v5.10.212","v5.10.211","v5.10.210","v5.10.209","v5.10.208","v5.10.207","v5.10.206","v5.10.205","v5.10.204","v5.10.203","v5.10.202","v5.10.201","v5.10.200","v5.10.199","v5.10.198","v5.10.197","v5.10.196","v5.10.195","v5.10.194","v5.10.193","v5.10.192","v5.10.191","v5.10.190","v5.10.189","v5.10.188","v5.10.187","v5.10.186","v5.10.185","v5.10.184","v5.10.183","v5.10.182","v5.10.181","v5.10.180","v5.10.179","v5.10.178","v5.10.177","v5.10.176","v5.10.175","v5.10.174","v5.10.173","v5.10.172","v5.10.171","v5.10.170","v5.10.169","v5.10.168","v5.10.167","v5.10.166","v5.10.165","v5.10.164","v5.10.163","v5.10.162","v5.10.161","v5.10.160","v5.10.159","v5.10.158","v5.10.157","v5.10.156","v5.10.155","v5.10.154","v5.10.153","v5.10.152","v5.10.151","v5.10.150","v5.10.149","v5.10.148","v5.10.147","v5.10.146","v5.10.145","v5.10.144","v5.10.143","v5.10.142","v5.10.141","v5.10.140","v5.10.139","v5.10.138","v5.10.137","v5.10.136","v5.10.135","v5.10.134","v5.10.133","v5.10.132","v5.10.131","v5.10.130","v5.10.129","v5.10.128","v5.10.127","v5.10.126","v5.10.125","v5.10.124","v5.10.123","v5.10.122","v5.10.121","v5.10.120","v5.10.119","v5.10.118","v5.10.117","v5.10.116","v5.10.115","v5.10.114","v5.10.113","v5.10.112","v5.10.111","v5.10.110","v5.10.109","v5.10.108","v5.10.107","v5.10.106","v5.10.105","v5.10.104","v5.10.103","v5.10.102","v5.10.101","v5.10.100","v5.10.99","v5.10.98","v5.10.97","v5.10.96","v5.10.95","v5.10.94","v5.10.93","v5.10.92","v5.10.91","v5.10.90","v5.10.89","v5.10.88","v5.10.87","v5.10.86","v5.10.85","v5.10.84","v5.10.83","v5.10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