CVE-2026-74507 (GCVE-0-2026-74507)
Vulnerability from cvelistv5
Published
2026-08-15 12:27
Modified
2026-08-19 16:38
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: HIDP: validate numbered report payloads
When hidp_get_raw_report() waits for a numbered report,
hidp_process_data() compares the expected report number with skb->data[0].
A connected HIDP peer can reply with only a DATA transaction header,
leaving the skb empty after the header is removed.
KMSAN reports an uninitialized-value use in hidp_session_run(), with the
value originating in __alloc_skb() through vhci_write(). The transaction
header checks remove the empty-frame reports, but this report remains until
the payload check is added.
The comparison can also consume a peer-controlled byte beyond the declared
L2CAP PDU. A DATA | FEATURE response followed by an extra 0x01 byte made
the current code accept that byte as report ID 1 and complete
HIDIOCGFEATURE with a zero-byte result. With this change the malformed
response is rejected with -EIO, while a subsequent valid response still
succeeds.
Require a payload byte before comparing a numbered report ID. Unnumbered
reports continue to accept an empty payload.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 0ff1731a1ae51e8e48cd559d70db536281c47f8e Version: 0ff1731a1ae51e8e48cd559d70db536281c47f8e Version: 0ff1731a1ae51e8e48cd559d70db536281c47f8e Version: 0ff1731a1ae51e8e48cd559d70db536281c47f8e Version: 0ff1731a1ae51e8e48cd559d70db536281c47f8e Version: 0ff1731a1ae51e8e48cd559d70db536281c47f8e Version: 0ff1731a1ae51e8e48cd559d70db536281c47f8e Version: 0ff1731a1ae51e8e48cd559d70db536281c47f8e |
||
{
"containers": {
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"programFiles": [
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"vendor": "Linux",
"versions": [
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"version": "2.6.39"
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"status": "unaffected",
"version": "0",
"versionType": "semver"
},
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"status": "unaffected",
"version": "5.10.265",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "5.15.216",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.183",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.6.151",
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},
{
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"status": "unaffected",
"version": "6.12.103",
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{
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"status": "unaffected",
"version": "6.18.44",
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},
{
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"status": "unaffected",
"version": "7.1.8",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"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: validate numbered report payloads\n\nWhen hidp_get_raw_report() waits for a numbered report,\nhidp_process_data() compares the expected report number with skb-\u003edata[0].\nA connected HIDP peer can reply with only a DATA transaction header,\nleaving the skb empty after the header is removed.\n\nKMSAN reports an uninitialized-value use in hidp_session_run(), with the\nvalue originating in __alloc_skb() through vhci_write(). The transaction\nheader checks remove the empty-frame reports, but this report remains until\nthe payload check is added.\n\nThe comparison can also consume a peer-controlled byte beyond the declared\nL2CAP PDU. A DATA | FEATURE response followed by an extra 0x01 byte made\nthe current code accept that byte as report ID 1 and complete\nHIDIOCGFEATURE with a zero-byte result. With this change the malformed\nresponse is rejected with -EIO, while a subsequent valid response still\nsucceeds.\n\nRequire a payload byte before comparing a numbered report ID. Unnumbered\nreports continue to accept an empty payload."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.1,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:A - The flaw is reached when a connected Bluetooth HIDP peer sends crafted DATA frames over the established L2CAP control channel; Bluetooth is an adjacent wireless vector, not local syscall/ioctl or physical USB access.\nAC:L - The malicious peer receives the host GET_REPORT and can deterministically reply with a header-only DATA frame or a malformed numbered-report payload; no race or rare layout conditions beyond an active HIDP session are required.\nPR:N - Exploitation is performed by the remote Bluetooth HIDP peer sending malicious protocol data; the attacker needs no local account, capabilities, or init-namespace root on the victim host.\nUI:N - Once a HIDP session exists, the peer can trigger the bug by answering host-initiated GET_REPORT requests from HIDIOCGFEATURE or kernel HID probe I/O without any additional victim action at exploit time.\nS:U - Impact is confined to kernel Bluetooth HIDP/hidraw handling on the victim host; it does not cross a VM, container, or IOMMU security boundary to affect a separate authority.\nC:H - With numbered reports, hidp_process_data() reads skb-\u003edata[0] when skb-\u003elen is zero or beyond the declared L2CAP PDU, causing an out-of-bounds/uninitialized heap read that may contain stale kernel memory.\nI:L - Accepting malformed numbered-report responses can complete HIDIOCGFEATURE with incorrect zero-length or attacker-chosen report-ID data, causing limited integrity impact on returned HID feature-report contents.\nA:N - The defect is an invalid payload-length check and uninitialized/OOB read during report matching; it does not cause a documented kernel oops, panic, hang, or repeatable denial of service."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-19T16:38:05.065Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/011bf4350d941f1995b2bd4b815ee206cacf2b8e"
},
{
"url": "https://git.kernel.org/stable/c/689d8bb7fee96b7196b572b015b6055c6616ce0c"
},
{
"url": "https://git.kernel.org/stable/c/c73beb320f5705e508bf7d385b8cc5ef8d9c8b69"
},
{
"url": "https://git.kernel.org/stable/c/b7ad105d46acd828e424454815e4cd31069e047a"
},
{
"url": "https://git.kernel.org/stable/c/7e7162427659b70ea17cd41b1f79e2e64c246690"
},
{
"url": "https://git.kernel.org/stable/c/27cc0e603355c585f1e5da8398faa4d36d498188"
},
{
"url": "https://git.kernel.org/stable/c/9c841f59e10b5d75c398a3fc6b2da448d2a2276b"
},
{
"url": "https://git.kernel.org/stable/c/34f53d27b81a16a02828c8fdfa4e02badc326f17"
}
],
"title": "Bluetooth: HIDP: validate numbered report payloads",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-74507",
"datePublished": "2026-08-15T12:27:30.683Z",
"dateReserved": "2026-08-15T05:44:03.908Z",
"dateUpdated": "2026-08-19T16:38:05.065Z",
"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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