{"id":"CVE-2021-47124","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring: fix link timeout refs\n\nWARNING: CPU: 0 PID: 10242 at lib/refcount.c:28 refcount_warn_saturate+0x15b/0x1a0 lib/refcount.c:28\nRIP: 0010:refcount_warn_saturate+0x15b/0x1a0 lib/refcount.c:28\nCall Trace:\n __refcount_sub_and_test include/linux/refcount.h:283 [inline]\n __refcount_dec_and_test include/linux/refcount.h:315 [inline]\n refcount_dec_and_test include/linux/refcount.h:333 [inline]\n io_put_req fs/io_uring.c:2140 [inline]\n io_queue_linked_timeout fs/io_uring.c:6300 [inline]\n __io_queue_sqe+0xbef/0xec0 fs/io_uring.c:6354\n io_submit_sqe fs/io_uring.c:6534 [inline]\n io_submit_sqes+0x2bbd/0x7c50 fs/io_uring.c:6660\n __do_sys_io_uring_enter fs/io_uring.c:9240 [inline]\n __se_sys_io_uring_enter+0x256/0x1d60 fs/io_uring.c:9182\n\nio_link_timeout_fn() should put only one reference of the linked timeout\nrequest, however in case of racing with the master request's completion\nfirst io_req_complete() puts one and then io_put_req_deferred() is\ncalled.","modified":"2026-03-15T22:43:05.282693Z","published":"2024-03-15T21:15:07.260Z","references":[{"type":"FIX","url":"https://git.kernel.org/stable/c/ff4a96ba5c8f9b266706280ff8021d2ef3f17e86"},{"type":"FIX","url":"https://git.kernel.org/stable/c/0b2a990e5d2f76d020cb840c456e6ec5f0c27530"},{"type":"FIX","url":"https://git.kernel.org/stable/c/6f5d7a45f58d3abe3a936de1441b8d6318f978ff"},{"type":"FIX","url":"https://git.kernel.org/stable/c/876808dba2ff7509bdd7f230c4f374a0caf4f410"},{"type":"FIX","url":"https://git.kernel.org/stable/c/a298232ee6b9a1d5d732aa497ff8be0d45b5bd82"}],"affected":[{"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-47124.json","unresolved_ranges":[{"events":[{"introduced":"5.10.26"},{"fixed":"5.10.43"}]},{"events":[{"introduced":"5.10.44"},{"fixed":"5.10.55"}]},{"events":[{"introduced":"5.12"},{"fixed":"5.12.10"}]},{"events":[{"introduced":"5.12.11"},{"fixed":"5.12.19"}]},{"events":[{"introduced":"0"},{"last_affected":"5.13-rc1"}]}]}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}