{"schema":"threatline.record/2","record":{"id":"CVE-2026-98773","aliases":[],"summary":"USB: cdc-acm: skip URB restart in port_shutdown if disconnected","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nUSB: cdc-acm: skip URB restart in port_shutdown if disconnected\n\nacm_port_shutdown() is called from the tty-port machinery whenever the\nlast user closes the port.  acm_disconnect() sets acm->disconnected and\ncalls tty_port_tty_vhangup(), which eventually triggers port_shutdown().\nAt that point acm_disconnect() has already called acm_poison_urbs() and\nis about to free the control and read URBs.\n\nHowever, acm_port_shutdown() unconditionally calls acm_unpoison_urbs()\nand, when the ALWAYS_POLL_CTRL quirk is set, immediately re-submits the\nctrlurb and all read URBs.  If the concurrent acm_disconnect() then\nfrees those URBs and their DMA buffers while they are in-flight, the\nresult is a use-after-free in acm_ctrl_irq() or acm_read_bulk_callback()\naccessing the freed DMA memory.\n\nFix by checking acm->disconnected after draining the delayed anchor and\nreturning early: if we are in a disconnect path the URBs must remain\npoisoned and must not be resubmitted.\n\nThe early return is placed after the delayed-anchor drain loop because\nthat loop only cancels write-side accounting (wb->use = false and\nautopm counter) and does not touch the hardware path.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98773","source_modified_at":"2026-10-21T12:56:48.532Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"8fb82e3555a7d56a05d8ef0edee9859f889c0860","lessThan":"d86775e79838d7d2e38ccf506a7d0f8e2dd4d5d0","status":"affected","versionType":"git"},{"version":"603d5a7110832e10165d21f9a1486399457177de","lessThan":"9742905d9ed5bf23ebe4c100dec80b6bc50fb522","status":"affected","versionType":"git"},{"version":"5d29d7ff8679e5a525f22da467ba33c042e8029b","lessThan":"a0ed07b5bbb2d8fcef86810453216070691816e7","status":"affected","versionType":"git"},{"version":"f58752ebcb35e156c85cd1a82d6579c7af3b9023","lessThan":"420ca35af891d33522cc08504768ccd60a4c450a","status":"affected","versionType":"git"},{"version":"f58752ebcb35e156c85cd1a82d6579c7af3b9023","lessThan":"dc614d6bc991740d41d5a99ac7765c4b675dda88","status":"affected","versionType":"git"},{"version":"d826061aa64cb28089bf4c73e301dd7928662b84","status":"affected","versionType":"git"},{"version":"283f8162cc3c82086537cbc7dc01870dbeb07a91","status":"affected","versionType":"git"},{"version":"f77f10bc76c2da86b4248269472f6d971e37828b","status":"affected","versionType":"git"},{"version":"6.6.136","lessThan":"6.6.160","status":"affected","versionType":"semver"},{"version":"6.12.83","lessThan":"6.12.113","status":"affected","versionType":"semver"},{"version":"6.18.24","lessThan":"6.18.56","status":"affected","versionType":"semver"},{"version":"6.1.175","lessThan":"6.2","status":"affected","versionType":"semver"},{"version":"6.19.14","lessThan":"6.20","status":"affected","versionType":"semver"},{"version":"7.0.1","lessThan":"7.1","status":"affected","versionType":"semver"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98773","source_modified_at":"2026-10-21T12:56:48.532Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"7.1","status":"affected"},{"version":"0","lessThan":"7.1","status":"unaffected","versionType":"semver"},{"version":"6.6.160","lessThanOrEqual":"6.6.*","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-2026-98773","source_modified_at":"2026-10-21T12:56:48.532Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"9742905d9ed5bf23ebe4c100dec80b6bc50fb522","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98773","source_modified_at":"2026-10-21T12:56:48.532Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"420ca35af891d33522cc08504768ccd60a4c450a","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98773","source_modified_at":"2026-10-21T12:56:48.532Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"6.6.160","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98773","source_modified_at":"2026-10-21T12:56:48.532Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"6.12.113","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98773","source_modified_at":"2026-10-21T12:56:48.532Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"6.18.56","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98773","source_modified_at":"2026-10-21T12:56:48.532Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"6.2","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98773","source_modified_at":"2026-10-21T12:56:48.532Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"6.20","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98773","source_modified_at":"2026-10-21T12:56:48.532Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"7.1","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.00168,"percentile":0.05748,"score_date":"2026-10-23"},"published_at":"2026-10-18T15:48:09.093Z","modified_at":"2026-10-21T12:56:48.532Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-98773","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-21T12:56:48.532Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-98773","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/d86775e79838d7d2e38ccf506a7d0f8e2dd4d5d0"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/9742905d9ed5bf23ebe4c100dec80b6bc50fb522"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/a0ed07b5bbb2d8fcef86810453216070691816e7"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/420ca35af891d33522cc08504768ccd60a4c450a"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/dc614d6bc991740d41d5a99ac7765c4b675dda88"}],"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":"2026-10-21T12:56:48.532Z","content_hash":"55fe6f0b399007f88305aaf78d87576583f2f5931fe73e28852361a19ee50aec"}}