CVE-2026-74300
Bluetooth: hci: validate codec capability element length
Description
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.
INFO
Published Date :
Aug. 15, 2026, 6:22 a.m.
Last Modified :
Aug. 15, 2026, 6:22 a.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products
The following products are affected by CVE-2026-74300
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Apply the Linux kernel patch for Bluetooth.
- Validate element length including the length byte.
- Ensure full element size is checked.
- Drop truncated controller responses.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-74300.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-74300 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-74300
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-74300 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-74300 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 15, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '8961987f3f5fa2f2618e72304d013c8dd5e604a6', 'lessThan': 'fc97fc8cf7f53fd3619db63e09050d20a3a0c4b1', 'versionType': 'git'}, {'status': 'affected', 'version': '8961987f3f5fa2f2618e72304d013c8dd5e604a6', 'lessThan': '290b36f9d1eb9b2f72b40d826f26b4a182ab15f7', 'versionType': 'git'}, {'status': 'affected', 'version': '8961987f3f5fa2f2618e72304d013c8dd5e604a6', 'lessThan': 'f2ad01f55e07f9531efcea736087e6b8658a3440', 'versionType': 'git'}, {'status': 'affected', 'version': '8961987f3f5fa2f2618e72304d013c8dd5e604a6', 'lessThan': 'ec4d352747a62c1082f16c11a74b37d6eb85a5a3', 'versionType': 'git'}, {'status': 'affected', 'version': '8961987f3f5fa2f2618e72304d013c8dd5e604a6', 'lessThan': '4bc16db0f11918e07edf9fdcda4a30cf4c9df45c', 'versionType': 'git'}, {'status': 'affected', 'version': '8961987f3f5fa2f2618e72304d013c8dd5e604a6', 'lessThan': 'c38fbcdc407925c7088f7e5f11c1fff73d2d35a2', 'versionType': 'git'}], 'programFiles': ['net/bluetooth/hci_codec.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.16'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.16', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/bluetooth/hci_codec.c'], 'defaultStatus': 'affected'}] Added Description 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. Added Reference https://git.kernel.org/stable/c/290b36f9d1eb9b2f72b40d826f26b4a182ab15f7 Added Reference https://git.kernel.org/stable/c/4bc16db0f11918e07edf9fdcda4a30cf4c9df45c Added Reference https://git.kernel.org/stable/c/c38fbcdc407925c7088f7e5f11c1fff73d2d35a2 Added Reference https://git.kernel.org/stable/c/ec4d352747a62c1082f16c11a74b37d6eb85a5a3 Added Reference https://git.kernel.org/stable/c/f2ad01f55e07f9531efcea736087e6b8658a3440 Added Reference https://git.kernel.org/stable/c/fc97fc8cf7f53fd3619db63e09050d20a3a0c4b1