{"schema":"threatline.record/2","record":{"id":"CVE-2026-98821","aliases":[],"summary":"block: reject polled dio with user integrity metadata","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nblock: reject polled dio with user integrity metadata\n\nIOCB_HAS_METADATA leaves iocb->private as a uio_meta, while\niocb_bio_iopoll() expects a bio. Since 2729a60bbfb9, metadata I/O\nalways uses __blkdev_direct_IO(), which never publishes the bio for\npolling, so IOPOLL calls bio_poll() on the uio_meta.\n\nReproducer: io_uring IOPOLL plus a PI attribute on an integrity device\n(scsi_debug dif=1 dix=1). KASAN reports:\n\n  Oops: general protection fault, probably for non-canonical\n  address 0xdffffc0000000004\n  KASAN: null-ptr-deref in range\n  [0x0000000000000020-0x0000000000000027]\n  RIP: 0010:bio_poll+0x9d/0x4b0\n  Call Trace:\n   iocb_bio_iopoll+0x5b/0x80\n   io_uring_classic_poll+0xf3/0x140\n   io_do_iopoll+0x4e3/0xc00\n   io_iopoll_check+0x275/0x560\n   __do_sys_io_uring_enter+0x2e5/0x720\n\nReturn -EOPNOTSUPP when HIPRI is combined with user metadata.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98821","source_modified_at":"2026-10-19T09:26:14.186Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"2729a60bbfb9215997f25372ebe9b7964f038296","lessThan":"c97ef13ad96be0e08af38dfa2ed40cded0b53e1b","status":"affected","versionType":"git"},{"version":"2729a60bbfb9215997f25372ebe9b7964f038296","lessThan":"dd33c03cefccdfcb223e9e6262643d64f8c1ae20","status":"affected","versionType":"git"},{"version":"2729a60bbfb9215997f25372ebe9b7964f038296","lessThan":"2a42e6fe1293f2e2d579c9fe5bbab056dd8b880e","status":"affected","versionType":"git"},{"version":"17ecefc9fdd8c554e0d03e5a990daef19f930add","status":"affected","versionType":"git"},{"version":"6.16.8","lessThan":"6.17","status":"affected","versionType":"semver"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98821","source_modified_at":"2026-10-19T09:26:14.186Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"6.17","status":"affected"},{"version":"0","lessThan":"6.17","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-2026-98821","source_modified_at":"2026-10-19T09:26:14.186Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"2a42e6fe1293f2e2d579c9fe5bbab056dd8b880e","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98821","source_modified_at":"2026-10-19T09:26:14.186Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"6.17","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.00166,"percentile":0.05526,"score_date":"2026-10-23"},"published_at":"2026-10-18T15:49:13.154Z","modified_at":"2026-10-19T09:26:14.186Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-98821","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-19T09:26:14.186Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-98821","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/c97ef13ad96be0e08af38dfa2ed40cded0b53e1b"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/dd33c03cefccdfcb223e9e6262643d64f8c1ae20"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/2a42e6fe1293f2e2d579c9fe5bbab056dd8b880e"}],"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":"2026-10-19T09:26:14.186Z","content_hash":"eddec7a54917430b91498d73822dbb7bc666b52b1724624b0220d611dc8a9828"}}