HighFix available

Bluetooth: hci: validate codec capability element length

Type: advisorySources: OSV

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci: validate codec capability element length Read Local Codec Capabilities returns a sequence of capability elements. Each element starts with a one-byte length followed by that many payload bytes. hci_read_codec_capabilities() checks that the skb contains the length byte, but then validates only caps->len against the remaining skb length. A malformed controller response with one remaining byte and caps->len set to one passes that check even though the element needs two bytes. The parser then records a two-byte capability and copies one byte beyond the advertised response payload into the codec list. Validate the full element size, including the length byte, before adding it to the accumulated capability length. This preserves all well-formed capability elements and drops only truncated controller responses.

Products: Kernel
Affected versions: Not specified
Fixed versions: 6.1.178, 6.12.97, 6.18.40, 6.6.145, 7.1.5
CVEs: CVE-2026-74300
Confirmed fixed CVEs: Not specified
Updated in this feed: 7 Nov 2026, 01:52 UTC · Revision 1

Source evidence

Bluetooth: hci: validate codec capability element length

core-osv · Original source

Published 15 Aug 2026, 05:58 UTC

osv:CVE-2026-74300

Kernel

Fixed versions: 6.1.178, 6.6.145, 6.12.97, 6.18.40, 7.1.5

Complete source record

{
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  "url": "https://osv.dev/vulnerability/CVE-2026-74300",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Bluetooth: hci: validate codec capability element length",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci: validate codec capability element length Read Local Codec Capabilities returns a sequence of capability elements. Each element starts with a one-byte length followed by that many payload bytes. hci_read_codec_capabilities() checks that the skb contains the length byte, but then validates only caps->len against the remaining skb length. A malformed controller response with one remaining byte and caps->len set to one passes that check even though the element needs two bytes. The parser then records a two-byte capability and copies one byte beyond the advertised response payload into the codec list. Validate the full element size, including the length byte, before adding it to the accumulated capability length. This preserves all well-formed capability elements and drops only truncated controller responses.",
    "evidence": "osv:CVE-2026-74300",
    "products": [
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      "aliases": [
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          "type": "CVSS_V3",
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            "ecosystem": "Linux"
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      ],
      "modified": "2026-10-28T02:30:48.718622138Z",
      "provider": "osv",
      "references": [
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      "provider_metadata": {
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    "severity_evidence": "/severity/0/score"
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  "source_id": "core-osv",
  "document_id": 517130,
  "published_at": "2026-08-15T05:58:03.348+00:00"
}