CVE-2026-74508 (GCVE-0-2026-74508)
Vulnerability from cvelistv5
Published
2026-08-15 12:27
Modified
2026-08-23 12:47
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: HIDP: reject frames without a transaction header
hidp_recv_ctrl_frame() and hidp_recv_intr_frame() read skb->data[0]
before checking that the L2CAP SDU contains a transaction header. A
connected HIDP peer can send an empty basic-mode SDU and make both paths
use an uninitialized byte from skb tailroom.
KMSAN reports the use in hidp_session_run(), with the uninitialized value
originating in __alloc_skb() through vhci_write(). The control path
produces two reports and the interrupt path produces one.
The byte can also be controlled by a malformed lower-layer packet. If an
HCI ACL packet contains an L2CAP PDU with a declared zero-length payload
followed by an extra 0x15 byte, l2cap_recv_acldata() reduces skb->len to
the declared PDU length before dispatch. The current HIDP path nevertheless
consumes the extra byte as HIDP_TRANS_HID_CONTROL |
HIDP_CTRL_VIRTUAL_CABLE_UNPLUG and terminates the HIDP session. With this
change, the same packet is discarded and a subsequent feature report
request succeeds.
Pull the transaction header with skb_pull_data() and discard frames that
do not contain it.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 |
||
{
"containers": {
"cna": {
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"product": "Linux",
"programFiles": [
"net/bluetooth/hidp/core.c"
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"versions": [
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"vendor": "Linux",
"versions": [
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"version": "2.6.12"
},
{
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"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "5.10.266",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.216",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.183",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.151",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.103",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.44",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "7.1.8",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
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"nodes": [
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}
],
"negate": false,
"operator": "OR"
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],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: HIDP: reject frames without a transaction header\n\nhidp_recv_ctrl_frame() and hidp_recv_intr_frame() read skb-\u003edata[0]\nbefore checking that the L2CAP SDU contains a transaction header. A\nconnected HIDP peer can send an empty basic-mode SDU and make both paths\nuse an uninitialized byte from skb tailroom.\n\nKMSAN reports the use in hidp_session_run(), with the uninitialized value\noriginating in __alloc_skb() through vhci_write(). The control path\nproduces two reports and the interrupt path produces one.\n\nThe byte can also be controlled by a malformed lower-layer packet. If an\nHCI ACL packet contains an L2CAP PDU with a declared zero-length payload\nfollowed by an extra 0x15 byte, l2cap_recv_acldata() reduces skb-\u003elen to\nthe declared PDU length before dispatch. The current HIDP path nevertheless\nconsumes the extra byte as HIDP_TRANS_HID_CONTROL |\nHIDP_CTRL_VIRTUAL_CABLE_UNPLUG and terminates the HIDP session. With this\nchange, the same packet is discarded and a subsequent feature report\nrequest succeeds.\n\nPull the transaction header with skb_pull_data() and discard frames that\ndo not contain it."
}
],
"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 - Malicious or malformed Bluetooth L2CAP SDUs reach hidp_recv_ctrl_frame()/hidp_recv_intr_frame() from a radio-adjacent peer via hci_acl_packet() -\u003e l2cap_recv_acldata() -\u003e l2cap_recv_frame() -\u003e l2cap_sock_recv_cb() -\u003e hidp_session_run().\nAC:L - A connected HIDP peer reliably triggers the bug by sending empty basic-mode SDUs or zero-length L2CAP PDUs with trailing bytes; the attacker controls both sides of the malformed-packet condition without races or rare kernel configs.\nPR:N - Exploitation requires only delivering crafted Bluetooth ACL/L2CAP traffic as the connected peer; the victim attacker does not need local accounts, capabilities, or CAP_NET_ADMIN on the target host.\nUI:N - Once a normal Bluetooth HID session is active (typical paired keyboard/mouse/headset use), the attacker can send malicious frames without any additional victim interaction during exploitation.\nS:U - The flaw affects kernel Bluetooth HIDP session handling only and does not cross VM, container, or IOMMU security boundaries; impact stays within the kernel Bluetooth/HID authority.\nC:H - On zero-length SDUs, hidp_recv_*_frame() reads skb-\u003edata[0] from uninitialized skb tailroom (KMSAN via vhci_write/__alloc_skb), leaking kernel heap bytes that drive subsequent protocol parsing.\nI:H - Attacker-controlled header bytes (e.g., malformed PDU trailing 0x15 = HIDP_TRANS_HID_CONTROL|HIDP_CTRL_VIRTUAL_CABLE_UNPLUG) force hidp_process_hid_control() to tear down sessions and can misroute other transaction types through handshake/data handlers.\nA:H - Forged virtual-cable-unplug and related control-path handling forcibly terminates active HIDP sessions, completely denying Bluetooth HID input/output on phones, laptops, kiosks, and embedded systems until reconnect."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-23T12:47:28.838Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/24c64ccd5c1fc9934b427335b0d976c7f2b1a7d8"
},
{
"url": "https://git.kernel.org/stable/c/238c333bc4b3f245c626632e8bfa3c9dab97f51b"
},
{
"url": "https://git.kernel.org/stable/c/567a2a0a633f2ea5fdccaf3517c09f22c9d860c7"
},
{
"url": "https://git.kernel.org/stable/c/46ca5ab39737d7c6f9ca77ecf714cdcfa6caaeec"
},
{
"url": "https://git.kernel.org/stable/c/97b61241ab45bfa5b0526cb0f3978942493bc811"
},
{
"url": "https://git.kernel.org/stable/c/2ebf63aa557a69990b4e9ea22be224d58aabce96"
},
{
"url": "https://git.kernel.org/stable/c/854194494a6f726a60b90b76059148bf08df023d"
},
{
"url": "https://git.kernel.org/stable/c/47778d2c2087b5d192398f6fddf692d16a5431cf"
}
],
"title": "Bluetooth: HIDP: reject frames without a transaction header",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-74508",
"datePublished": "2026-08-15T12:27:31.288Z",
"dateReserved": "2026-08-15T05:44:03.908Z",
"dateUpdated": "2026-08-23T12:47:28.838Z",
"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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