{"id":"CVE-2023-53111","summary":"loop: Fix use-after-free issues","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nloop: Fix use-after-free issues\n\ndo_req_filebacked() calls blk_mq_complete_request() synchronously or\nasynchronously when using asynchronous I/O unless memory allocation fails.\nHence, modify loop_handle_cmd() such that it does not dereference 'cmd' nor\n'rq' after do_req_filebacked() finished unless we are sure that the request\nhas not yet been completed. This patch fixes the following kernel crash:\n\nUnable to handle kernel NULL pointer dereference at virtual address 0000000000000054\nCall trace:\n css_put.42938+0x1c/0x1ac\n loop_process_work+0xc8c/0xfd4\n loop_rootcg_workfn+0x24/0x34\n process_one_work+0x244/0x558\n worker_thread+0x400/0x8fc\n kthread+0x16c/0x1e0\n ret_from_fork+0x10/0x20","modified":"2026-04-03T13:14:30.023605Z","published":"2025-05-02T15:55:51.029Z","related":["SUSE-SU-2025:01918-1","SUSE-SU-2025:01966-1","SUSE-SU-2025:02173-1","SUSE-SU-2025:02262-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53111.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/407badf73ec9fb0d5744bf2ca1745c1818aa222f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6917395c4667cfb607ed8bf1826205a59414657c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9b0cb770f5d7b1ff40bea7ca385438ee94570eec"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e3fda704903f6d1fc351412f1bc6620333959ada"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53111.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-53111"},{"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":"bc07c10a3603a5ab3ef01ba42b3d41f9ac63d1b6"},{"fixed":"407badf73ec9fb0d5744bf2ca1745c1818aa222f"},{"fixed":"e3fda704903f6d1fc351412f1bc6620333959ada"},{"fixed":"6917395c4667cfb607ed8bf1826205a59414657c"},{"fixed":"9b0cb770f5d7b1ff40bea7ca385438ee94570eec"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-53111.json"}}],"schema_version":"1.7.5"}