{"id":"CVE-2026-74395","summary":"RDMA/mlx5: Fix devx subscribe-event unwind NULL dereference","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/mlx5: Fix devx subscribe-event unwind NULL dereference\n\nMLX5_IB_METHOD_DEVX_SUBSCRIBE_EVENT() links event_sub into sub_list\nbefore initializing the fields used by the shared error path.\n\nIf eventfd_ctx_fdget() then fails, the unwind path dereferences\nevent_sub-\u003eev_file in uverbs_uobject_put() and calls\nsubscribe_event_xa_dealloc() with an unset xa_key_level1.\n\nsubscribe_event_xa_alloc() creates the XA entry exactly once for a given\nkey_level1, on the first occurrence of that key. The unwind path must\ntherefore call subscribe_event_xa_dealloc() exactly once for it as well.\n\nEnforce that by adding devx_key_in_sub_list() and calling\nsubscribe_event_xa_dealloc() only when the last matching pending entry is\nbeing cleaned up.","modified":"2026-08-18T03:31:28.534532334Z","published":"2026-08-15T05:59:07.798Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74395.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/1025dc2f7ba29b04b8687790fa91f9cd1a53141e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/43f8f7946814c8e5f464518246fdbc69b6e32326"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5100febf8e9d6c8c5ba8dc6534c6a5e3376e5989"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6e15b770461eeaa0ff73934922cb670a6a9db04e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/78b9589fda266c71f0f9d0c858d4fa7381a890a5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7921821fc2b19c01588311f6e7468ae5b68b1f61"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9be9aca28424228586fe9211c373ebdb826ebb6c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f345e744b6b087188cde2377da5cbe9713b61353"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74395.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74395"},{"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":"7597385371425febdaa8c6a1da3625d4ffff16f5"},{"fixed":"6e15b770461eeaa0ff73934922cb670a6a9db04e"},{"fixed":"9be9aca28424228586fe9211c373ebdb826ebb6c"},{"fixed":"f345e744b6b087188cde2377da5cbe9713b61353"},{"fixed":"1025dc2f7ba29b04b8687790fa91f9cd1a53141e"},{"fixed":"7921821fc2b19c01588311f6e7468ae5b68b1f61"},{"fixed":"5100febf8e9d6c8c5ba8dc6534c6a5e3376e5989"},{"fixed":"78b9589fda266c71f0f9d0c858d4fa7381a890a5"},{"fixed":"43f8f7946814c8e5f464518246fdbc69b6e32326"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74395.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.3.0"},{"fixed":"5.10.261"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.212"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.178"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.145"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.97"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.40"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.5"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74395.json"}}],"schema_version":"1.9.0"}