CVE-2026-68389 (GCVE-0-2026-68389)
Vulnerability from cvelistv5
Published
2026-08-10 12:04
Modified
2026-08-17 05:04
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: hci_qca: Clear memdump state on invalid dump size
qca_controller_memdump() allocates qca->qca_memdump before processing
the first dump packet. For a sequence-zero packet it then disables IBS,
marks memdump collection active, and reads the advertised dump size.
If the controller reports a zero dump size, the error path frees the
local qca_memdump object and returns without clearing qca->qca_memdump
or undoing the collection state. A later memdump work item initializes
its local pointer from qca->qca_memdump and skips allocation when that
pointer is non-NULL, so it can operate on freed memory. The stale
collection and IBS-disabled flags can also leave waiters or later
transmit handling blocked behind an aborted dump.
Clear the saved pointer and memdump state before returning from the
invalid-size path, matching the cleanup used when hci_devcd_init() fails.
A static analysis checker reported the stale memdump state, and manual
source review confirmed the invalid-size failure path.
References
Impacted products
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/bluetooth/hci_qca.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "5a3945e8dea6c9a8ec9e981169ac9487e1d6ad6a",
"status": "affected",
"version": "06d3fdfcdf5cefb06f2024b9d3dad356779399cf",
"versionType": "git"
},
{
"lessThan": "069258d5111eed9ac9586bee42d03d38e2975715",
"status": "affected",
"version": "06d3fdfcdf5cefb06f2024b9d3dad356779399cf",
"versionType": "git"
},
{
"lessThan": "cefb44c367b2b52e50f97bc8526d39df9bcf5e60",
"status": "affected",
"version": "06d3fdfcdf5cefb06f2024b9d3dad356779399cf",
"versionType": "git"
},
{
"lessThan": "2363a757694752426fc47f3eadde15cf5f791fa5",
"status": "affected",
"version": "06d3fdfcdf5cefb06f2024b9d3dad356779399cf",
"versionType": "git"
},
{
"lessThan": "bf587a10c33e5571a299742e45bc18960b9912e7",
"status": "affected",
"version": "06d3fdfcdf5cefb06f2024b9d3dad356779399cf",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/bluetooth/hci_qca.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.6"
},
{
"lessThan": "6.6",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.148",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.101",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.42",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.6",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.148",
"versionStartIncluding": "6.6",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.101",
"versionStartIncluding": "6.6",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.42",
"versionStartIncluding": "6.6",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1.6",
"versionStartIncluding": "6.6",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2",
"versionStartIncluding": "6.6",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"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-\u003eqca_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-\u003eqca_memdump\nor undoing the collection state. A later memdump work item initializes\nits local pointer from qca-\u003eqca_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": {
"baseScore": 8.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"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 \u2014 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\u0027s own heap and authority; no VM escape, IOMMU bypass, or sandbox boundary is crossed.\nC:H - The stale qca-\u003eqca_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."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-17T05:04:36.839Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"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"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-68389",
"datePublished": "2026-08-10T12:04:08.306Z",
"dateReserved": "2026-07-30T09:28:09.388Z",
"dateUpdated": "2026-08-17T05:04:36.839Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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