{"id":"CVE-2021-47012","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/siw: Fix a use after free in siw_alloc_mr\n\nOur code analyzer reported a UAF.\n\nIn siw_alloc_mr(), it calls siw_mr_add_mem(mr,..). In the implementation of\nsiw_mr_add_mem(), mem is assigned to mr-\u003emem and then mem is freed via\nkfree(mem) if xa_alloc_cyclic() failed. Here, mr-\u003emem still point to a\nfreed object. After, the execution continue up to the err_out branch of\nsiw_alloc_mr, and the freed mr-\u003emem is used in siw_mr_drop_mem(mr).\n\nMy patch moves \"mr-\u003emem = mem\" behind the if (xa_alloc_cyclic(..)\u003c0) {}\nsection, to avoid the uaf.","modified":"2026-03-15T14:45:39.431123Z","published":"2024-02-28T09:15:38.753Z","related":["SUSE-SU-2024:0856-1","SUSE-SU-2024:0857-1","SUSE-SU-2024:0926-1"],"references":[{"type":"FIX","url":"https://git.kernel.org/stable/c/3093ee182f01689b89e9f8797b321603e5de4f63"},{"type":"FIX","url":"https://git.kernel.org/stable/c/30b9e92d0b5e5d5dc1101ab856c17009537cbca4"},{"type":"FIX","url":"https://git.kernel.org/stable/c/3e22b88e02c194f6c80867abfef5cc09383461f4"},{"type":"FIX","url":"https://git.kernel.org/stable/c/608a4b90ece039940e9425ee2b39c8beff27e00c"},{"type":"FIX","url":"https://git.kernel.org/stable/c/ad9ce7188432650469a6c7625bf479f5ed0b6155"}],"affected":[{"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-47012.json","unresolved_ranges":[{"events":[{"introduced":"5.3"},{"fixed":"5.4.119"}]},{"events":[{"introduced":"5.5"},{"fixed":"5.10.37"}]},{"events":[{"introduced":"5.11"},{"fixed":"5.11.21"}]},{"events":[{"introduced":"5.12"},{"fixed":"5.12.4"}]}]}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}