CVE-2026-64573

Kernel memory corruption via firmware TLV underflow

Published Aug 5, 2026 · Updated Aug 5, 2026

Out-of-bounds access in the Linux kernel QCA Bluetooth driver allows local users to crash the system via crafted firmware TLV data. In qca_tlv_check_data(), subtracting a 12-byte record size from a signed length below 12 converts the result to a huge size_t loop bound, causing reads and handler writes beyond the firmware buffer. Exploitation requires local low-privilege access to supply crafted firmware data during QCA Bluetooth device setup; resulting memory corruption can disclose kernel data, crash the system, or enable code execution.

CVSS severity7.0
High
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds access in the Linux kernel QCA Bluetooth driver allows local users to crash the system via crafted firmware TLV data. In qca_tlv_check_data(), subtracting a 12-byte record size from a signed length below 12 converts the result to a huge size_t loop bound, causing reads and handler writes beyond the firmware buffer. Exploitation requires local low-privilege access to supply crafted firmware data during QCA Bluetooth device setup; resulting memory corruption can disclose kernel data, crash the system, or enable code execution.

The record

CVE
CVE-2026-64573
Published
Aug 5, 2026
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=02f05ed44b71152d5e11d29be28aed91c0489b4e
  2. Affected versionversion=1caceadfb50432dbf6d808796cb6c34ebb6d662c
  3. Affected versionversion=2e4edfa1e2bd821a317e7d006517dcf2f3fac68d <4fcfb5b2c736785464ff9745f94c6726c5ee2d85
  4. Affected versionversion=2e4edfa1e2bd821a317e7d006517dcf2f3fac68d <59fd2f075bca94f030c7c78e94878ea0803d7690
  5. Affected versionversion=2e4edfa1e2bd821a317e7d006517dcf2f3fac68d <a087ed960fce54e9302796229e9d545bbc9bcd4a
  6. Affected versionversion=2e4edfa1e2bd821a317e7d006517dcf2f3fac68d <c90164ca0f7036942ba088eb7ea8d3f6c2352020
  7. Affected versionversion=427281f9498ed614f9aabc80e46ec077c487da6d <70354dbb5f72d9a76da7b031de3cbaf6c7d8fc24
  8. Affected versionversion=5.15.159 <5.16
  9. Affected versionversion=6.1.91 <6.2
  10. Affected versionversion=6.6.31 <6.6.148
  11. Affected versionversion=6.8.10 <6.9
  12. Affected versionversion=6.9
  13. Affected versionversion=ed53949cc92e28aaa3463d246942bda1fbb7f307

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=02f05ed44b71152d5e11d29be28aed91c0489b4e; version=1caceadfb50432dbf6d808796cb6c34ebb6d662c; version=2e4edfa1e2bd821a317e7d006517dcf2f3fac68d <4fcfb5b2c736785464ff9745f94c6726c5ee2d85; version=2e4edfa1e2bd821a317e7d006517dcf2f3fac68d <59fd2f075bca94f030c7c78e94878ea0803d7690; version=2e4edfa1e2bd821a317e7d006517dcf2f3fac68d <a087ed960fce54e9302796229e9d545bbc9bcd4a; version=2e4edfa1e2bd821a317e7d006517dcf2f3fac68d <c90164ca0f7036942ba088eb7ea8d3f6c2352020; version=427281f9498ed614f9aabc80e46ec077c487da6d <70354dbb5f72d9a76da7b031de3cbaf6c7d8fc24; version=5.15.159 <5.16; version=6.1.91 <6.2; version=6.6.31 <6.6.148; version=6.8.10 <6.9; version=6.9; version=ed53949cc92e28aaa3463d246942bda1fbb7f307

Published CVSS scores

7.0Red HatCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read

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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