CVE-2026-53255

Kernel out-of-bounds read via unchecked Bluetooth TLV

Published Jun 25, 2026 · Updated Jun 25, 2026

Out-of-bounds read in the Linux kernel Bluetooth MGMT parser allows local users to trigger a one-byte over-read via malformed advertising data. The tlv_data_is_valid() function inspects an EIR type byte before proving that the length-prefixed field contains that byte. Reachability requires local access capable of submitting MGMT_OP_ADD_ADVERTISING; published evidence establishes the read but not code execution.

CVSS severity7.1
High
EPSS probability0.12%
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 read in the Linux kernel Bluetooth MGMT parser allows local users to trigger a one-byte over-read via malformed advertising data. The tlv_data_is_valid() function inspects an EIR type byte before proving that the length-prefixed field contains that byte. Reachability requires local access capable of submitting MGMT_OP_ADD_ADVERTISING; published evidence establishes the read but not code execution.

The record

CVE
CVE-2026-53255
Published
Jun 25, 2026
Updated
Jun 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-125
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 25, 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=2bb36870e8cb29949ef9acec37129cd8e70f1857 <06fcbd79c3c360a50f9be9d370769bbd738d0976
  2. Affected versionversion=2bb36870e8cb29949ef9acec37129cd8e70f1857 <13ad995071a06570668dd8daab3616c247c72080
  3. Affected versionversion=2bb36870e8cb29949ef9acec37129cd8e70f1857 <18fea1cb0c2599752e908c8217490f73ddd33e00
  4. Affected versionversion=2bb36870e8cb29949ef9acec37129cd8e70f1857 <1a3c8ffbb469859b076445af44bdfa6a711d483e
  5. Affected versionversion=2bb36870e8cb29949ef9acec37129cd8e70f1857 <2a3f3ed9e198ae23c15859ace2f9ca6cfdc35b57
  6. Affected versionversion=2bb36870e8cb29949ef9acec37129cd8e70f1857 <74c08e4db35a476c3462aeb65846f955be732626
  7. Affected versionversion=2bb36870e8cb29949ef9acec37129cd8e70f1857 <de23fb62259aa01d294f77238ae3b835eb674413
  8. Affected versionversion=2bb36870e8cb29949ef9acec37129cd8e70f1857 <f7093ac233c1e7f51d125534f46067772a113175
  9. Affected versionversion=4.9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=2bb36870e8cb29949ef9acec37129cd8e70f1857 <06fcbd79c3c360a50f9be9d370769bbd738d0976; version=2bb36870e8cb29949ef9acec37129cd8e70f1857 <13ad995071a06570668dd8daab3616c247c72080; version=2bb36870e8cb29949ef9acec37129cd8e70f1857 <18fea1cb0c2599752e908c8217490f73ddd33e00; version=2bb36870e8cb29949ef9acec37129cd8e70f1857 <1a3c8ffbb469859b076445af44bdfa6a711d483e; version=2bb36870e8cb29949ef9acec37129cd8e70f1857 <2a3f3ed9e198ae23c15859ace2f9ca6cfdc35b57; version=2bb36870e8cb29949ef9acec37129cd8e70f1857 <74c08e4db35a476c3462aeb65846f955be732626; version=2bb36870e8cb29949ef9acec37129cd8e70f1857 <de23fb62259aa01d294f77238ae3b835eb674413; version=2bb36870e8cb29949ef9acec37129cd8e70f1857 <f7093ac233c1e7f51d125534f46067772a113175; version=4.9

Published CVSS scores

7.1NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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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