{"id":"CVE-2021-47569","state":"PUBLISHED","title":"io_uring: fail cancellation for EXITING tasks","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.","publishedAt":"2024-05-24T15:12:55.394Z","updatedAt":"2026-05-11T13:57:09.623Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"89b263f6d56e683ddcf7643140271ef6e36c72b9","status":"affected","lessThan":"3d2a1e68fd9904fdc1b02f2e7d40ca47df7ba39f","versionType":"git"},{"version":"89b263f6d56e683ddcf7643140271ef6e36c72b9","status":"affected","lessThan":"617a89484debcd4e7999796d693cf0b77d2519de","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/io_uring.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.15","versionType":"semver"},{"version":"5.15.6","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"5.16","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/io_uring.c"]}],"references":["https://git.kernel.org/stable/c/3d2a1e68fd9904fdc1b02f2e7d40ca47df7ba39f","https://git.kernel.org/stable/c/617a89484debcd4e7999796d693cf0b77d2519de"],"weaknesses":[],"ingestedAt":"2026-10-29T19:49:19.404Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/47xxx/CVE-2021-47569.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2021-47569","state":"PUBLISHED","datePublished":"2024-05-24T15:12:55.394Z","dateUpdated":"2026-05-11T13:57:09.623Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-05-24T15:11:00.729Z"},"containers":{"cna":{"title":"io_uring: fail cancellation for EXITING tasks","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"89b263f6d56e683ddcf7643140271ef6e36c72b9","status":"affected","lessThan":"3d2a1e68fd9904fdc1b02f2e7d40ca47df7ba39f","versionType":"git"},{"version":"89b263f6d56e683ddcf7643140271ef6e36c72b9","status":"affected","lessThan":"617a89484debcd4e7999796d693cf0b77d2519de","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/io_uring.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.15","versionType":"semver"},{"version":"5.15.6","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"5.16","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/io_uring.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/3d2a1e68fd9904fdc1b02f2e7d40ca47df7ba39f"},{"url":"https://git.kernel.org/stable/c/617a89484debcd4e7999796d693cf0b77d2519de"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T13:57:09.623Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"5.15.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"5.16"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CVE Program Container","references":[{"url":"https://git.kernel.org/stable/c/3d2a1e68fd9904fdc1b02f2e7d40ca47df7ba39f","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/617a89484debcd4e7999796d693cf0b77d2519de","tags":["x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-04T05:39:59.633Z"}},{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2021-47569","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2024-09-10T15:35:11.017717Z"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2024-09-11T17:32:50.979Z"}}]}}}