{"id":"CVE-2026-72491","summary":"net/9p: fix race condition on rdma-\u003estate in trans_rdma.c","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/9p: fix race condition on rdma-\u003estate in trans_rdma.c\n\nThe rdma-\u003estate field is modified without holding req_lock in both\nrecv_done() and p9_cm_event_handler(), while rdma_request() accesses\nthe same field under the req_lock spinlock. This inconsistent locking\ncreates a race condition:\n\n- recv_done() running in softirq completion context sets\n  rdma-\u003estate = P9_RDMA_FLUSHING without acquiring req_lock\n\n- p9_cm_event_handler() modifies rdma-\u003estate at multiple points\n  (ADDR_RESOLVED, ROUTE_RESOLVED, ESTABLISHED, CLOSED) without\n  req_lock\n\n- rdma_request() uses spin_lock_irqsave(&rdma-\u003ereq_lock, flags) to\n  protect the read-modify-write of rdma-\u003estate\n\nThe race can cause lost state transitions: recv_done() or the CM\nevent handler could set state to FLUSHING/CLOSED while rdma_request()\nis concurrently checking or modifying state under the lock, leading to\nthe FLUSHING transition being silently overwritten by CLOSING. This\ncorrupts the connection state machine and can cause use-after-free on\nRDMA request objects during teardown.\n\nFix by adding req_lock protection to all rdma-\u003estate modifications in\nrecv_done() and p9_cm_event_handler(), matching the pattern already\nused in rdma_request(). Use spin_lock_irqsave/spin_unlock_irqrestore\nin the CM event handler since it can race with recv_done() which runs\nin softirq context.\n\nTested with a kernel module that races two threads (simulating\nrdma_request and recv_done/CM handler) on rdma-\u003estate with proper\nlocking: 5.5M+ FLUSHING writes over 27M iterations with 0 lost\ntransitions.","modified":"2026-08-18T03:56:26.824637853Z","published":"2026-08-15T05:57:26.281Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72491.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/13bf9879b778b2f4b260b45bed18f31806120d1e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/151f8cf5b23d8a534d884432a82a6d54d5a61989"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3970a19a80de530b801b6256354d4a529a9a2d6c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4cee2b8766045059d5e0b8114837b4a8efe827ac"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5424138848eb7d7d8a7196676e90a2cbf2142454"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7d54894a1ee265a72d70f7cae1da6cc774cccc71"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8aadc136d8e8d8fc95d7982d213cfe2234dfcf2b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ebbcbe5c0db215feecc17def06178da443f4eea6"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72491.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72491"},{"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":"473c7dd1d7b59ff8f88a5154737e3eac78a96e5b"},{"fixed":"4cee2b8766045059d5e0b8114837b4a8efe827ac"},{"fixed":"5424138848eb7d7d8a7196676e90a2cbf2142454"},{"fixed":"3970a19a80de530b801b6256354d4a529a9a2d6c"},{"fixed":"8aadc136d8e8d8fc95d7982d213cfe2234dfcf2b"},{"fixed":"151f8cf5b23d8a534d884432a82a6d54d5a61989"},{"fixed":"13bf9879b778b2f4b260b45bed18f31806120d1e"},{"fixed":"ebbcbe5c0db215feecc17def06178da443f4eea6"},{"fixed":"7d54894a1ee265a72d70f7cae1da6cc774cccc71"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"3479b3c35e82ed10aa0ca2ee9e78c4eded06ba62"},{"last_affected":"c01ddaa54d7411e964ffd250c018d8469c5852f2"},{"last_affected":"9e69c673fe077b8dc491cd8406c9bdcb1f76dee2"},{"last_affected":"e48e7e27e4dfd00c81e0381e7cee610cce021452"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4.4.185"},{"fixed":"4.5"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4.9.185"},{"fixed":"4.10"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4.14.132"},{"fixed":"4.15"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4.19.57"},{"fixed":"4.20"}]}],"versions":["v4.4.184","v4.9.184","v4.14.131","v4.19.56","v4.14.130","v4.9.183","v4.4.183","v4.14.129","v4.19.55","v4.19.54","v4.4.182","v4.9.182","v4.14.128","v4.19.53","v4.14.127","v4.19.52","v4.4.181","v4.9.181","v4.14.126","v4.19.51","v4.14.125","v4.19.50","v4.4.180","v4.9.180","v4.14.124","v4.19.49","v4.14.123","v4.19.48","v4.19.47","v4.9.179","v4.14.122","v4.19.46","v4.9.178","v4.14.121","v4.19.45","v4.19.44","v4.14.120","v4.9.177","v4.4.179","v4.9.176","v4.14.119","v4.19.43","v4.9.175","v4.14.118","v4.19.42","v4.19.41","v4.14.117","v4.9.174","v4.19.40","v4.14.116","v4.9.173","v4.19.39","v4.19.38","v4.14.115","v4.9.172","v4.19.37","v4.14.114","v4.9.171","v4.19.36","v4.14.113","v4.9.170","v4.4.178","v4.19.35","v4.14.112","v4.9.169","v4.19.34","v4.14.111","v4.9.168","v4.19.33","v4.14.110","v4.9.167","v4.19.32","v4.14.109","v4.9.166","v4.4.177","v4.19.31","v4.14.108","v4.9.165","v4.19.30","v4.14.107","v4.9.164","v4.4.176","v4.9.163","v4.14.106","v4.19.29","v4.9.162","v4.14.105","v4.19.28","v4.19.27","v4.19.26","v4.14.104","v4.9.161","v4.19.25","v4.14.103","v4.9.160","v4.19.24","v4.14.102","v4.9.159","v4.4.175","v4.19.23","v4.14.101","v4.9.158","v4.4.174","v4.19.22","v4.14.100","v4.9.157","v4.19.21","v4.14.99","v4.9.156","v4.19.20","v4.14.98","v4.9.155","v4.4.173","v4.4.172","v4.9.154","v4.14.97","v4.19.19","v4.19.18","v4.14.96","v4.9.153","v4.4.171","v4.9.152","v4.14.95","v4.19.17","v4.9.151","v4.14.94","v4.19.16","v4.19","v4.4.170","v4.9.150","v4.14.93","v4.19.15","v4.4.169","v4.9.149","v4.14.92","v4.19.14","v4.19.13","v4.14.91","v4.9.148","v4.9.147","v4.14.90","v4.19.12","v4.19.11","v4.14.89","v4.9.146","v4.4.168","v4.19.10","v4.4.167","v4.9.145","v4.14.88","v4.19.9","v4.4.166","v4.9.144","v4.14.87","v4.19.8","v4.9.143","v4.14.86","v4.19.7","v4.9.142","v4.14.85","v4.19.6","v4.4.165","v4.9.141","v4.14.84","v4.19.5","v4.19.4","v4.14.83","v4.9.140","v4.4.164","v4.9.139","v4.9.138","v4.14.82","v4.19.3","v4.4.163","v4.9.137","v4.14.81","v4.19.2","v4.9.136","v4.14.80","v4.19.1","v4.14.79","v4.9.135","v4.4.162","v4.14.78","v4.19-rc2","v4.19-rc8","v4.19-rc4","v4.4.161","v4.9.134","v4.14.77","v4.19-rc1","v4.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