CVE-2026-74300

Out-of-bounds read via truncated codec capability

Published Aug 15, 2026 · Updated Aug 15, 2026

An out-of-bounds read in affected Linux kernel versions allows attackers to copy data beyond a malformed Bluetooth controller response. hci_read_codec_capabilities() compares only caps->len with the remaining skb length, omitting the element's one-byte length field before recording and copying the element. Reachability requires control of a Bluetooth controller response; the parser copies one byte beyond the advertised payload into the codec list.

CVSS severity8.8
High
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

An out-of-bounds read in affected Linux kernel versions allows attackers to copy data beyond a malformed Bluetooth controller response. hci_read_codec_capabilities() compares only caps->len with the remaining skb length, omitting the element's one-byte length field before recording and copying the element. Reachability requires control of a Bluetooth controller response; the parser copies one byte beyond the advertised payload into the codec list.

The record

CVE
CVE-2026-74300
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.16
  2. Affected versionversion=8961987f3f5fa2f2618e72304d013c8dd5e604a6 <290b36f9d1eb9b2f72b40d826f26b4a182ab15f7
  3. Affected versionversion=8961987f3f5fa2f2618e72304d013c8dd5e604a6 <4bc16db0f11918e07edf9fdcda4a30cf4c9df45c
  4. Affected versionversion=8961987f3f5fa2f2618e72304d013c8dd5e604a6 <c38fbcdc407925c7088f7e5f11c1fff73d2d35a2
  5. Affected versionversion=8961987f3f5fa2f2618e72304d013c8dd5e604a6 <ec4d352747a62c1082f16c11a74b37d6eb85a5a3
  6. Affected versionversion=8961987f3f5fa2f2618e72304d013c8dd5e604a6 <f2ad01f55e07f9531efcea736087e6b8658a3440
  7. Affected versionversion=8961987f3f5fa2f2618e72304d013c8dd5e604a6 <fc97fc8cf7f53fd3619db63e09050d20a3a0c4b1

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.16; version=8961987f3f5fa2f2618e72304d013c8dd5e604a6 <290b36f9d1eb9b2f72b40d826f26b4a182ab15f7; version=8961987f3f5fa2f2618e72304d013c8dd5e604a6 <4bc16db0f11918e07edf9fdcda4a30cf4c9df45c; version=8961987f3f5fa2f2618e72304d013c8dd5e604a6 <c38fbcdc407925c7088f7e5f11c1fff73d2d35a2; version=8961987f3f5fa2f2618e72304d013c8dd5e604a6 <ec4d352747a62c1082f16c11a74b37d6eb85a5a3; version=8961987f3f5fa2f2618e72304d013c8dd5e604a6 <f2ad01f55e07f9531efcea736087e6b8658a3440; version=8961987f3f5fa2f2618e72304d013c8dd5e604a6 <fc97fc8cf7f53fd3619db63e09050d20a3a0c4b1

Published CVSS scores

5.5OracleCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
3.4Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:L
8.8CanonicalCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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