{"id":"CVE-2026-46138","state":"PUBLISHED","title":"Bluetooth: hci_event: Fix OOB read and infinite loop in hci_le_create_big_complete_evt","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_event: Fix OOB read and infinite loop in hci_le_create_big_complete_evt\n\nhci_le_create_big_complete_evt() iterates over BT_BOUND connections for\na BIG handle using a while loop, accessing ev->bis_handle[i++] on each\niteration.  However, there is no check that i stays within ev->num_bis\nbefore the array access.\n\nWhen a controller sends a LE_Create_BIG_Complete event with fewer\nbis_handle entries than there are BT_BOUND connections for that BIG,\nor with num_bis=0, the loop reads beyond the valid bis_handle[] flex\narray into adjacent heap memory.  Since the out-of-bounds values\ntypically exceed HCI_CONN_HANDLE_MAX (0x0EFF), hci_conn_set_handle()\nrejects them and the connection remains in BT_BOUND state.  The same\nconnection is then found again by hci_conn_hash_lookup_big_state(),\ncreating an infinite loop with hci_dev_lock held.\n\nFix this by terminating the BIG if in case not all BIS could be setup\nproperly.","publishedAt":"2026-05-28T09:35:54.467Z","updatedAt":"2026-10-19T19:36:52.126Z","severity":{"score":8.1,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"a0bfde167b506423111ddb8cd71930497a40fc54","status":"affected","lessThan":"6cb7f67bc28da787499291a562d49a084d9c90cd","versionType":"git"},{"version":"a0bfde167b506423111ddb8cd71930497a40fc54","status":"affected","lessThan":"22559ad7654f61727fc270ee4893da9f4b70cf17","versionType":"git"},{"version":"a0bfde167b506423111ddb8cd71930497a40fc54","status":"affected","lessThan":"77981a507aa0fc001dc37f0dd6631dd2042fed17","versionType":"git"},{"version":"a0bfde167b506423111ddb8cd71930497a40fc54","status":"affected","lessThan":"665da0baaf0396f9ed3c86ccb3955dcd0b73e774","versionType":"git"},{"version":"a0bfde167b506423111ddb8cd71930497a40fc54","status":"affected","lessThan":"5ddb8014261137cadaf83ab5617a588d80a22586","versionType":"git"},{"version":"b475c1109251e30ec21fb574d72a1c71a4ab0039","status":"affected","versionType":"git"},{"version":"2ccde10127447c1a5caad8469fede945bdb62fdf","status":"affected","versionType":"git"},{"version":"6.4.16","status":"affected","lessThan":"6.5","versionType":"semver"},{"version":"6.5.3","status":"affected","lessThan":"6.6","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/hci_event.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.6","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.6","versionType":"semver"},{"version":"6.6.140","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.88","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.30","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.7","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/hci_event.c"]}],"references":["https://git.kernel.org/stable/c/6cb7f67bc28da787499291a562d49a084d9c90cd","https://git.kernel.org/stable/c/22559ad7654f61727fc270ee4893da9f4b70cf17","https://git.kernel.org/stable/c/77981a507aa0fc001dc37f0dd6631dd2042fed17","https://git.kernel.org/stable/c/665da0baaf0396f9ed3c86ccb3955dcd0b73e774","https://git.kernel.org/stable/c/5ddb8014261137cadaf83ab5617a588d80a22586"],"weaknesses":["CWE-125"],"ingestedAt":"2026-10-29T20:12:07.131Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/46xxx/CVE-2026-46138.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-46138","state":"PUBLISHED","datePublished":"2026-05-28T09:35:54.467Z","dateUpdated":"2026-10-19T19:36:52.126Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-05-13T15:03:33.100Z"},"containers":{"cna":{"title":"Bluetooth: hci_event: Fix OOB read and infinite loop in hci_le_create_big_complete_evt","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_event: Fix OOB read and infinite loop in hci_le_create_big_complete_evt\n\nhci_le_create_big_complete_evt() iterates over BT_BOUND connections for\na BIG handle using a while loop, accessing ev->bis_handle[i++] on each\niteration.  However, there is no check that i stays within ev->num_bis\nbefore the array access.\n\nWhen a controller sends a LE_Create_BIG_Complete event with fewer\nbis_handle entries than there are BT_BOUND connections for that BIG,\nor with num_bis=0, the loop reads beyond the valid bis_handle[] flex\narray into adjacent heap memory.  Since the out-of-bounds values\ntypically exceed HCI_CONN_HANDLE_MAX (0x0EFF), hci_conn_set_handle()\nrejects them and the connection remains in BT_BOUND state.  The same\nconnection is then found again by hci_conn_hash_lookup_big_state(),\ncreating an infinite loop with hci_dev_lock held.\n\nFix this by terminating the BIG if in case not all BIS could be setup\nproperly."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"a0bfde167b506423111ddb8cd71930497a40fc54","status":"affected","lessThan":"6cb7f67bc28da787499291a562d49a084d9c90cd","versionType":"git"},{"version":"a0bfde167b506423111ddb8cd71930497a40fc54","status":"affected","lessThan":"22559ad7654f61727fc270ee4893da9f4b70cf17","versionType":"git"},{"version":"a0bfde167b506423111ddb8cd71930497a40fc54","status":"affected","lessThan":"77981a507aa0fc001dc37f0dd6631dd2042fed17","versionType":"git"},{"version":"a0bfde167b506423111ddb8cd71930497a40fc54","status":"affected","lessThan":"665da0baaf0396f9ed3c86ccb3955dcd0b73e774","versionType":"git"},{"version":"a0bfde167b506423111ddb8cd71930497a40fc54","status":"affected","lessThan":"5ddb8014261137cadaf83ab5617a588d80a22586","versionType":"git"},{"version":"b475c1109251e30ec21fb574d72a1c71a4ab0039","status":"affected","versionType":"git"},{"version":"2ccde10127447c1a5caad8469fede945bdb62fdf","status":"affected","versionType":"git"},{"version":"6.4.16","status":"affected","lessThan":"6.5","versionType":"semver"},{"version":"6.5.3","status":"affected","lessThan":"6.6","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/hci_event.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.6","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.6","versionType":"semver"},{"version":"6.6.140","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.88","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.30","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.7","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/hci_event.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/6cb7f67bc28da787499291a562d49a084d9c90cd"},{"url":"https://git.kernel.org/stable/c/22559ad7654f61727fc270ee4893da9f4b70cf17"},{"url":"https://git.kernel.org/stable/c/77981a507aa0fc001dc37f0dd6631dd2042fed17"},{"url":"https://git.kernel.org/stable/c/665da0baaf0396f9ed3c86ccb3955dcd0b73e774"},{"url":"https://git.kernel.org/stable/c/5ddb8014261137cadaf83ab5617a588d80a22586"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","baseScore":8.1,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:A - The vulnerable handler is in the Bluetooth ISO/BIS stack; per kernel CNA convention Bluetooth subsystem bugs are reachable by an attacker within Bluetooth radio range, i.e. the adjacent vector.\nAC:L - An event with num_bis=0 (or fewer bis_handle entries than bound connections) deterministically triggers the OOB read and the infinite loop; the OOB heap values reliably exceed HCI_CONN_HANDLE_MAX, so no uncontrolled condition is required.\nPR:N - Exploitation requires no privileges or credentials on the target host; the malformed BIG-complete event is processed without any authentication gate.\nUI:N - No victim interaction is needed at exploit time — the device merely has to be operating as a BIS broadcaster, which is a configuration state, not a per-attack user action.\nS:U - The OOB read and the hang are confined to the kernel's own security authority; no boundary such as a VM/hypervisor or IOMMU is crossed.\nC:H - The loop reads the bis_handle[] flex array out of bounds into adjacent heap memory (up to ~512 bytes), well beyond a few bounded bytes, which under kernel guidance is scored High.\nI:N - The bug path performs only an out-of-bounds read and a spinning lookup; there is no out-of-bounds write or memory corruption that modifies kernel state.\nA:H - The OOB values keep the connection in BT_BOUND, producing an infinite loop while hci_dev_lock is held, which hangs the HCI device and causes a denial of service."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-05T12:30:00.334Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"6.6.140"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"6.12.88"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"6.18.30"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"7.0.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"7.1"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.4.16"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.5.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-46138","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2026-10-16T15:20:20.651932Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-125","lang":"en","type":"CWE","description":"CWE-125 Out-of-bounds Read"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-19T19:36:52.126Z"}}]}}}