CVE-2026-53251

Service interruption via leaked Bluetooth controller references

Published Jun 25, 2026 · Updated Jun 25, 2026

Resource leakage in the Linux Kernel Bluetooth ISO subsystem allows local users to exhaust host-controller references and interrupt service. The iso_conn_big_sync function obtains a reference-counted hci_dev from hci_get_route but omits hci_dev_put on both successful and error exits. Exploitation requires low-privilege local access and repeated Bluetooth ISO BIG synchronization; the reported impact is availability loss without data exposure or modification.

CVSS severity5.5
Medium
EPSS probability0.16%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource leakage in the Linux Kernel Bluetooth ISO subsystem allows local users to exhaust host-controller references and interrupt service. The iso_conn_big_sync function obtains a reference-counted hci_dev from hci_get_route but omits hci_dev_put on both successful and error exits. Exploitation requires low-privilege local access and repeated Bluetooth ISO BIG synchronization; the reported impact is availability loss without data exposure or modification.

The record

CVE
CVE-2026-53251
Published
Jun 25, 2026
Updated
Jun 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-772, T1499.001
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=07a9342b94a91b306ed1cf6aa8254aea210764c9 <23e8eb16820b866528fb300dc67fe3f67f00ef62
  2. Affected versionversion=07a9342b94a91b306ed1cf6aa8254aea210764c9 <33d677d2e3713d98012c3dbd4a9207f7d785b854
  3. Affected versionversion=07a9342b94a91b306ed1cf6aa8254aea210764c9 <5cbf290b79351971f20c7a533247e8d58a3f970c
  4. Affected versionversion=1360e5b6ce63d63d23223a659ca2bbafa30a53aa <4bbec25f47b930101294fd310c627c3f53e9661f
  5. Affected versionversion=6.11.11 <6.12
  6. Affected versionversion=6.12.2 <6.12.94
  7. Affected versionversion=6.13
  8. Affected versionversion=bfec1e55314896bf4a4cfdb3a9ad4872be9f06ed

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=07a9342b94a91b306ed1cf6aa8254aea210764c9 <23e8eb16820b866528fb300dc67fe3f67f00ef62; version=07a9342b94a91b306ed1cf6aa8254aea210764c9 <33d677d2e3713d98012c3dbd4a9207f7d785b854; version=07a9342b94a91b306ed1cf6aa8254aea210764c9 <5cbf290b79351971f20c7a533247e8d58a3f970c; version=1360e5b6ce63d63d23223a659ca2bbafa30a53aa <4bbec25f47b930101294fd310c627c3f53e9661f; version=6.11.11 <6.12; version=6.12.2 <6.12.94; version=6.13; version=bfec1e55314896bf4a4cfdb3a9ad4872be9f06ed

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-772Missing Release of Resource after Effective Lifetime
T1499.001OS Exhaustion Flood

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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