{"schema":"threatline.record/2","record":{"id":"CVE-2026-98858","aliases":[],"summary":"io_uring: fix task_work add use-after-free with SQPOLL","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring: fix task_work add use-after-free with SQPOLL\n\nFor SQPOLL, the sqpoll thread runs task_work off its own list and\ndoesn't need to be told about it, so it can pop and complete a request\nas soon as mpscq_push() has published it. If that was the last request\nholding the ring alive, io_ring_exit_work() then frees the ctx, stops\nthe thread, and with it the tctx, while io_req_normal_work_add() is\nstill looking at both after the push:\n\n  BUG: KASAN: slab-use-after-free in io_req_normal_work_add+0x439/0x510\n  Read of size 4 at addr ff11000000ca0000 by task repro/55\n  (...)\n  BUG: KASAN: slab-use-after-free in queue_work_on+0x25/0x70\n  Write of size 8 at addr ff11000000c3bd00 by task repro/55\n\nHold an RCU read lock across the add, like io_req_local_work_add() already\ndoes, and have io_ring_exit_work() wait for a grace period for SQPOLL rings\nas well before freeing the ctx.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98858","source_modified_at":"2026-10-19T09:26:52.852Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"af5d68f8892f8ee8f137648b79ceb2abc153a19b","lessThan":"42b3332efacfd2140be4cd0dedad4fb96b8ae90e","status":"affected","versionType":"git"},{"version":"af5d68f8892f8ee8f137648b79ceb2abc153a19b","lessThan":"891bd8335a0de3bb15c3b797ce3026bbb0dbef6c","status":"affected","versionType":"git"},{"version":"af5d68f8892f8ee8f137648b79ceb2abc153a19b","lessThan":"395b25968fe854d4efaa19a8e9b7a5b6d1b3eea3","status":"affected","versionType":"git"},{"version":"af5d68f8892f8ee8f137648b79ceb2abc153a19b","lessThan":"a92193c91e8839fe5fc209616ea95465ae4b919d","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98858","source_modified_at":"2026-10-19T09:26:52.852Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"6.9","status":"affected"},{"version":"0","lessThan":"6.9","status":"unaffected","versionType":"semver"},{"version":"6.12.113","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.56","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.10","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98858","source_modified_at":"2026-10-19T09:26:52.852Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"42b3332efacfd2140be4cd0dedad4fb96b8ae90e","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98858","source_modified_at":"2026-10-19T09:26:52.852Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"891bd8335a0de3bb15c3b797ce3026bbb0dbef6c","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98858","source_modified_at":"2026-10-19T09:26:52.852Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"395b25968fe854d4efaa19a8e9b7a5b6d1b3eea3","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.00157,"percentile":0.04452,"score_date":"2026-10-23"},"published_at":"2026-10-18T15:51:19.578Z","modified_at":"2026-10-19T09:26:52.852Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-98858","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-19T09:26:52.852Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-98858","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/42b3332efacfd2140be4cd0dedad4fb96b8ae90e"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/891bd8335a0de3bb15c3b797ce3026bbb0dbef6c"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/395b25968fe854d4efaa19a8e9b7a5b6d1b3eea3"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/a92193c91e8839fe5fc209616ea95465ae4b919d"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-19T09:26:52.852Z","content_hash":"3e5dd5d87a504f413f6f1c30e7a9e09fc8ed4711dd70ada6dd19c718dcf59289"}}