{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-98456", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.350Z", "datePublished": "2026-10-18T15:15:05.909Z", "dateUpdated": "2026-10-24T14:08:55.253Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-24T14:08:55.253Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: mgmt: fix race in read_unconf_index_list()\n\nread_unconf_index_list() counts unconfigured controllers before allocating\nits response, then checks the device flags again while filling it.\n\nhci_dev_list_lock stabilizes list membership, but it does not serialize the\nper-device flags. During asynchronous controller setup, the worker can set\nHCI_UNCONFIGURED and clear HCI_SETUP between the two passes. A controller\nomitted from the allocation count can then become eligible for the fill\npass, causing an out-of-bounds write to rp->index[].\n\nAllocate space for every device on hci_dev_list. Since list membership\ncannot change while hci_dev_list_lock is held, the response remains large\nenough regardless of flag transitions. The reported count and response\nlength still include only eligible unconfigured controllers." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - sendmsg() on a local PF_BLUETOOTH/BTPROTO_HCI socket bound to HCI_CHANNEL_CONTROL reaches hci_sock_sendmsg()->hci_mgmt_cmd()->read_unconf_index_list(). No over-the-air Bluetooth message supplies this management command or the corrupted data.\nAC:H - The overwrite requires the setup worker to set HCI_UNCONFIGURED and clear HCI_SETUP between read_unconf_index_list()'s sizing and filling walks. An untrusted management-socket caller cannot initiate or synchronize that controller-setup transition, so success depends on external timing.\nPR:L - mgmt_handlers[] marks MGMT_OP_READ_UNCONF_INDEX_LIST with HCI_MGMT_UNTRUSTED, and hci_sock_bind() permits HCI_CHANNEL_CONTROL binding without CAP_NET_ADMIN. Therefore any local user can issue the zero-length command.\nUI:N - The attacker can repeatedly send the management command without another user opening data or approving an operation; asynchronous controller setup is system state rather than required user interaction.\nS:U - The allocation and rp->index[] overwrite occur in read_unconf_index_list() within the host kernel heap, and no VM, IOMMU, or other security-authority boundary is crossed.\nC:H - When a newly eligible controller exceeds the allocation basis, rp->index[count++] writes 16-bit IDs past the kmalloc buffer and corrupts adjacent kernel heap storage; exploitable heap corruption can expose arbitrary kernel data.\nI:H - rp->index[count++] performs an out-of-bounds heap write for each newly eligible controller, allowing adjacent kernel objects to be modified and potentially enabling control-flow hijacking.\nA:H - The out-of-bounds writes can corrupt allocator or adjacent-object state and cause a kernel oops or panic, resulting in complete host availability loss." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/bluetooth/mgmt.c" ], "versions": [ { "version": "73d1df2a7a1036a1f000e5f0ece6ade3e082b854", "lessThan": "524e0450dd9a396f99a81b045219b0e2ea0dab57", "status": "affected", "versionType": "git" }, { "version": "73d1df2a7a1036a1f000e5f0ece6ade3e082b854", "lessThan": "8ddf962c76432a10a6cb80042875cbc48a9c056b", "status": "affected", "versionType": "git" }, { "version": "73d1df2a7a1036a1f000e5f0ece6ade3e082b854", "lessThan": "416546cd6a54e9b68f2b91bc680b1ee17dcd77a1", "status": "affected", "versionType": "git" }, { "version": "73d1df2a7a1036a1f000e5f0ece6ade3e082b854", "lessThan": "2e8bba0360d1379bfa8da47c8f5dadbb10a3fba1", "status": "affected", "versionType": "git" }, { "version": "73d1df2a7a1036a1f000e5f0ece6ade3e082b854", "lessThan": "b5dbb41b212c50c095a4dbee3017a84fe94f033b", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/bluetooth/mgmt.c" ], "versions": [ { "version": "3.17", "status": "affected" }, { "version": "0", "lessThan": "3.17", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.158", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.112", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.55", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.9", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.17", "versionEndExcluding": "6.6.158" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.17", "versionEndExcluding": "6.12.112" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.17", "versionEndExcluding": "6.18.55" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.17", "versionEndExcluding": "7.2.9" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.17", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/524e0450dd9a396f99a81b045219b0e2ea0dab57" }, { "url": "https://git.kernel.org/stable/c/8ddf962c76432a10a6cb80042875cbc48a9c056b" }, { "url": "https://git.kernel.org/stable/c/416546cd6a54e9b68f2b91bc680b1ee17dcd77a1" }, { "url": "https://git.kernel.org/stable/c/2e8bba0360d1379bfa8da47c8f5dadbb10a3fba1" }, { "url": "https://git.kernel.org/stable/c/b5dbb41b212c50c095a4dbee3017a84fe94f033b" } ], "title": "Bluetooth: mgmt: fix race in read_unconf_index_list()", "x_generator": { "engine": "bippy-1.2.0" } } } }