{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2021-46942","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-02-25T13:45:52.721Z","datePublished":"2024-02-27T18:40:29.280Z","dateUpdated":"2025-05-04T07:00:52.314Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2025-05-04T07:00:52.314Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring: fix shared sqpoll cancellation hangs\n\n[  736.982891] INFO: task iou-sqp-4294:4295 blocked for more than 122 seconds.\n[  736.982897] Call Trace:\n[  736.982901]  schedule+0x68/0xe0\n[  736.982903]  io_uring_cancel_sqpoll+0xdb/0x110\n[  736.982908]  io_sqpoll_cancel_cb+0x24/0x30\n[  736.982911]  io_run_task_work_head+0x28/0x50\n[  736.982913]  io_sq_thread+0x4e3/0x720\n\nWe call io_uring_cancel_sqpoll() one by one for each ctx either in\nsq_thread() itself or via task works, and it's intended to cancel all\nrequests of a specified context. However the function uses per-task\ncounters to track the number of inflight requests, so it counts more\nrequests than available via currect io_uring ctx and goes to sleep for\nthem to appear (e.g. from IRQ), that will never happen.\n\nCancel a bit more than before, i.e. all ctxs that share sqpoll\nand continue to use shared counters. Don't forget that we should not\nremove ctx from the list before running that task_work sqpoll-cancel,\notherwise the function wouldn't be able to find the context and will\nhang."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/io_uring.c"],"versions":[{"version":"37d1e2e3642e2380750d7f35279180826f29660e","lessThan":"cb5e0b3d0f993a6268c1a2c7ede2f9aa0c17ef68","status":"affected","versionType":"git"},{"version":"37d1e2e3642e2380750d7f35279180826f29660e","lessThan":"734551df6f9bedfbefcd113ede665945e9de0b99","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/io_uring.c"],"versions":[{"version":"5.12","status":"affected"},{"version":"0","lessThan":"5.12","status":"unaffected","versionType":"semver"},{"version":"5.12.3","lessThanOrEqual":"5.12.*","status":"unaffected","versionType":"semver"},{"version":"5.13","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.12","versionEndExcluding":"5.12.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.12","versionEndExcluding":"5.13"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/cb5e0b3d0f993a6268c1a2c7ede2f9aa0c17ef68"},{"url":"https://git.kernel.org/stable/c/734551df6f9bedfbefcd113ede665945e9de0b99"}],"title":"io_uring: fix shared sqpoll cancellation hangs","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2024-08-04T05:17:42.981Z"},"title":"CVE Program Container","references":[{"url":"https://git.kernel.org/stable/c/cb5e0b3d0f993a6268c1a2c7ede2f9aa0c17ef68","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/734551df6f9bedfbefcd113ede665945e9de0b99","tags":["x_transferred"]}]},{"metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2021-46942","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2024-09-10T16:01:51.334180Z"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2024-09-11T17:33:54.249Z"}}]}}