{"cve":"CVE-2021-47569","nvd":{"published":"2024-05-24T15:15:22.203","modified":"2026-06-17T04:17:47.360","status":"Analyzed","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring: fail cancellation for EXITING tasks\n\nWARNING: CPU: 1 PID: 20 at fs/io_uring.c:6269 io_try_cancel_userdata+0x3c5/0x640 fs/io_uring.c:6269\nCPU: 1 PID: 20 Comm: kworker/1:0 Not tainted 5.16.0-rc1-syzkaller #0\nWorkqueue: events io_fallback_req_func\nRIP: 0010:io_try_cancel_userdata+0x3c5/0x640 fs/io_uring.c:6269\nCall Trace:\n <TASK>\n io_req_task_link_timeout+0x6b/0x1e0 fs/io_uring.c:6886\n io_fallback_req_func+0xf9/0x1ae fs/io_uring.c:1334\n process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298\n worker_thread+0x658/0x11f0 kernel/workqueue.c:2445\n kthread+0x405/0x4f0 kernel/kthread.c:327\n ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295\n </TASK>\n\nWe need original task's context to do cancellations, so if it's dying\nand the callback is executed in a fallback mode, fail the cancellation\nattempt.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":[],"references":["https://git.kernel.org/stable/c/3d2a1e68fd9904fdc1b02f2e7d40ca47df7ba39f","https://git.kernel.org/stable/c/617a89484debcd4e7999796d693cf0b77d2519de","https://git.kernel.org/stable/c/3d2a1e68fd9904fdc1b02f2e7d40ca47df7ba39f","https://git.kernel.org/stable/c/617a89484debcd4e7999796d693cf0b77d2519de"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T21:50:30.954589733+00:00"},"epss":{"cve":"CVE-2021-47569","score":0.00181,"percentile":0.0766,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}