{"schema":"threatline.record/2","record":{"id":"CVE-2026-93783","aliases":[],"summary":"Bluetooth: RFCOMM: validate skb length in rfcomm_recv_frame","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: RFCOMM: validate skb length in rfcomm_recv_frame\n\nrfcomm_recv_frame() casts skb->data to struct rfcomm_hdr and dereferences\nhdr->addr and hdr->ctrl without validating skb->len first. A truncated\nframe with skb->len less than the minimum header size causes an\nout-of-bounds read of uninitialized memory. Additionally, a zero-length\nframe causes skb->len-- to underflow to UINT_MAX, making\nskb_tail_pointer() read far past the buffer.\n\nCommit 23882b828c3c (\"Bluetooth: RFCOMM: validate skb length in MCC\nhandlers\") fixed the same class of missing-length-check bugs in the MCC\nsub-handlers, but the top-level rfcomm_recv_frame() was left unfixed.\nKMSAN reports:\n\n  BUG: KMSAN: uninit-value in rfcomm_run\n  ...\n  Uninit was created at:\n    __alloc_skb+0x474/0xb60\n    vhci_write+0xe9/0x870\n\nFix this by rejecting frames smaller than sizeof(struct rfcomm_hdr) + 1\n(the minimum frame must have a 3-byte header and a 1-byte FCS).","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93783","source_modified_at":"2026-10-03T10:57:18.054Z","fetched_at":"2026-10-23T18:52:38.922436Z","product":"Linux","vendor":"Linux","versions":[{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"fb40eda15122f6b780228639c1ead6820340ff54","status":"affected","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"3829af5fab5a22405bf1e7d69068c2ec0fce46ca","status":"affected","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"b161eacd7fa4a2d765724b5504ac6cc388e48f80","status":"affected","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"30d1d9f3495463f7c026e4c553127f79b486fcd6","status":"affected","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"67dc3b40fae71b6b11c71e7ff69bac0758818c05","status":"affected","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"bbc310caa2b6bf5fe42896ba27da0fbc12e4ac51","status":"affected","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"b230e5bf501c5edaf2eb0991cb862ac142031d4b","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93783","source_modified_at":"2026-10-03T10:57:18.054Z","fetched_at":"2026-10-23T18:52:38.922436Z","product":"Linux","vendor":"Linux","versions":[{"version":"2.6.12","status":"affected"},{"version":"0","lessThan":"2.6.12","status":"unaffected","versionType":"semver"},{"version":"5.10.271","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.222","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.189","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.158","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.111","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.53","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93783","source_modified_at":"2026-10-03T10:57:18.054Z","fetched_at":"2026-10-23T18:52:38.922436Z","package":{"name":"Linux","ecosystem":null},"version":"3829af5fab5a22405bf1e7d69068c2ec0fce46ca","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93783","source_modified_at":"2026-10-03T10:57:18.054Z","fetched_at":"2026-10-23T18:52:38.922436Z","package":{"name":"Linux","ecosystem":null},"version":"30d1d9f3495463f7c026e4c553127f79b486fcd6","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93783","source_modified_at":"2026-10-03T10:57:18.054Z","fetched_at":"2026-10-23T18:52:38.922436Z","package":{"name":"Linux","ecosystem":null},"version":"67dc3b40fae71b6b11c71e7ff69bac0758818c05","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.00173,"percentile":0.06362,"score_date":"2026-10-23"},"published_at":"2026-09-24T16:02:17.149Z","modified_at":"2026-10-03T10:57:18.054Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-93783","fetched_at":"2026-10-23T18:52:38.922436Z","source_modified_at":"2026-10-03T10:57:18.054Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-93783","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/fb40eda15122f6b780228639c1ead6820340ff54"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/3829af5fab5a22405bf1e7d69068c2ec0fce46ca"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/b161eacd7fa4a2d765724b5504ac6cc388e48f80"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/30d1d9f3495463f7c026e4c553127f79b486fcd6"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/67dc3b40fae71b6b11c71e7ff69bac0758818c05"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/bbc310caa2b6bf5fe42896ba27da0fbc12e4ac51"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/b230e5bf501c5edaf2eb0991cb862ac142031d4b"}],"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":"2026-10-03T10:57:18.054Z","content_hash":"168b1ee5e2464875368d1e0017ead1676bdd596a444fe3d4d047d62e999d0684"}}