{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-68389", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-30T09:28:09.388Z", "datePublished": "2026-08-10T12:04:08.306Z", "dateUpdated": "2026-08-17T05:04:36.839Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:04:36.839Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_qca: Clear memdump state on invalid dump size\n\nqca_controller_memdump() allocates qca->qca_memdump before processing\nthe first dump packet. For a sequence-zero packet it then disables IBS,\nmarks memdump collection active, and reads the advertised dump size.\n\nIf the controller reports a zero dump size, the error path frees the\nlocal qca_memdump object and returns without clearing qca->qca_memdump\nor undoing the collection state. A later memdump work item initializes\nits local pointer from qca->qca_memdump and skips allocation when that\npointer is non-NULL, so it can operate on freed memory. The stale\ncollection and IBS-disabled flags can also leave waiters or later\ntransmit handling blocked behind an aborted dump.\n\nClear the saved pointer and memdump state before returning from the\ninvalid-size path, matching the cleanup used when hci_devcd_init() fails.\n\nA static analysis checker reported the stale memdump state, and manual\nsource review confirmed the invalid-size failure path." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:A - The vulnerable memdump packets arrive as QCA vendor HCI events (QCA_SSR_DUMP_HANDLE) emitted by the Bluetooth controller after a firmware crash/SSR, a state a nearby attacker induces or controls by attacking QCA controller firmware over the radio link, matching the CNA convention of scoring controller-event-driven Bluetooth driver bugs as Adjacent.\nAC:L - An attacker controlling the controller-to-host HCI stream deterministically triggers the flaw by sending a sequence-0 memdump packet with dump_size 0 followed by any further memdump packet; there is no race and no attacker-uncontrollable timing or memory-layout precondition.\nPR:N - No host credentials or authentication are needed: the memdump event is consumed unconditionally by qca_recv_event() on the driver receive path with no pairing, bonding, or capability check before qca_controller_memdump() runs.\nUI:N - SSR/memdump handling is fully automatic — qca_controller_memdump_event() queues the work item on receipt, so no local user has to open, mount, or confirm anything.\nS:U - The dangling pointer, use-after-free writes, and double free all occur in the host kernel's own heap and authority; no VM escape, IOMMU bypass, or sandbox boundary is crossed.\nC:H - The stale qca->qca_memdump gives a use-after-free on a kmalloc-16 object that an attacker can reclaim with another kernel allocation, and the freed fields (received_dump/ram_dump_size) then drive hci_devcd_append() length arithmetic, yielding attacker-influenced kernel memory disclosure per UAF exploitation.\nI:H - The reused freed object receives attacker-supplied 32-bit values (ram_dump_size straight from the packet, plus current_seq_no/received_dump) and is later kfree()d again, providing a controlled heap write and double-free primitive usable for arbitrary write and control-flow hijack.\nA:H - Beyond the use-after-free/double-free oops (KASAN slab-use-after-free), the uncleared QCA_MEMDUMP_COLLECTION and QCA_IBS_DISABLED flags leave wait_on_bit_timeout() waiters and the IBS transmit path stalled behind an aborted dump, persistently wedging the Bluetooth device." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/bluetooth/hci_qca.c" ], "versions": [ { "version": "06d3fdfcdf5cefb06f2024b9d3dad356779399cf", "lessThan": "5a3945e8dea6c9a8ec9e981169ac9487e1d6ad6a", "status": "affected", "versionType": "git" }, { "version": "06d3fdfcdf5cefb06f2024b9d3dad356779399cf", "lessThan": "069258d5111eed9ac9586bee42d03d38e2975715", "status": "affected", "versionType": "git" }, { "version": "06d3fdfcdf5cefb06f2024b9d3dad356779399cf", "lessThan": "cefb44c367b2b52e50f97bc8526d39df9bcf5e60", "status": "affected", "versionType": "git" }, { "version": "06d3fdfcdf5cefb06f2024b9d3dad356779399cf", "lessThan": "2363a757694752426fc47f3eadde15cf5f791fa5", "status": "affected", "versionType": "git" }, { "version": "06d3fdfcdf5cefb06f2024b9d3dad356779399cf", "lessThan": "bf587a10c33e5571a299742e45bc18960b9912e7", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/bluetooth/hci_qca.c" ], "versions": [ { "version": "6.6", "status": "affected" }, { "version": "0", "lessThan": "6.6", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.148", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.101", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.42", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.6", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "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": "6.6", "versionEndExcluding": "6.6.148" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.12.101" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.18.42" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "7.1.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/5a3945e8dea6c9a8ec9e981169ac9487e1d6ad6a" }, { "url": "https://git.kernel.org/stable/c/069258d5111eed9ac9586bee42d03d38e2975715" }, { "url": "https://git.kernel.org/stable/c/cefb44c367b2b52e50f97bc8526d39df9bcf5e60" }, { "url": "https://git.kernel.org/stable/c/2363a757694752426fc47f3eadde15cf5f791fa5" }, { "url": "https://git.kernel.org/stable/c/bf587a10c33e5571a299742e45bc18960b9912e7" } ], "title": "Bluetooth: hci_qca: Clear memdump state on invalid dump size", "x_generator": { "engine": "bippy-1.2.0" } } } }