CVE-2026-63945

Local kernel compromise via Bluetooth socket race

Published Jul 19, 2026 · Updated Jul 19, 2026

Race condition in Linux Kernel allows local users to crash or compromise the kernel through Bluetooth ISO socket teardown. The iso_sock_clear_timer function reads iso_pi(sk)->conn without the socket lock while iso_conn_del can clear and free that connection. A local low-privileged user with access to Bluetooth ISO sockets can trigger a null dereference or use-after-free, causing a host crash or kernel compromise.

CVSS severity7.8
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

Race condition in Linux Kernel allows local users to crash or compromise the kernel through Bluetooth ISO socket teardown. The iso_sock_clear_timer function reads iso_pi(sk)->conn without the socket lock while iso_conn_del can clear and free that connection. A local low-privileged user with access to Bluetooth ISO sockets can trigger a null dereference or use-after-free, causing a host crash or kernel compromise.

The record

CVE
CVE-2026-63945
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 19, 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=6.0
  2. Affected versionversion=ccf74f2390d60a2f9a75ef496d2564abb478f46a <35f68f36d9883d56dec21cf85f7556d4657fc393
  3. Affected versionversion=ccf74f2390d60a2f9a75ef496d2564abb478f46a <4b5f8e608749b7e8fa386c6e4301cf9272595859
  4. Affected versionversion=ccf74f2390d60a2f9a75ef496d2564abb478f46a <51cb9dcfdf9a1bccf312ab2ae4b62db629f7dcd5
  5. Affected versionversion=ccf74f2390d60a2f9a75ef496d2564abb478f46a <996c2104d0726a8fe584f85b3d6327197374a348
  6. Affected versionversion=ccf74f2390d60a2f9a75ef496d2564abb478f46a <bc08c15746f25f41dd0508b25780d1e84acbb2ef
  7. Affected versionversion=ccf74f2390d60a2f9a75ef496d2564abb478f46a <d9cbf7144ec589a3f0cc91f74a1a1af2d2b14afa

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.0; version=ccf74f2390d60a2f9a75ef496d2564abb478f46a <35f68f36d9883d56dec21cf85f7556d4657fc393; version=ccf74f2390d60a2f9a75ef496d2564abb478f46a <4b5f8e608749b7e8fa386c6e4301cf9272595859; version=ccf74f2390d60a2f9a75ef496d2564abb478f46a <51cb9dcfdf9a1bccf312ab2ae4b62db629f7dcd5; version=ccf74f2390d60a2f9a75ef496d2564abb478f46a <996c2104d0726a8fe584f85b3d6327197374a348; version=ccf74f2390d60a2f9a75ef496d2564abb478f46a <bc08c15746f25f41dd0508b25780d1e84acbb2ef; version=ccf74f2390d60a2f9a75ef496d2564abb478f46a <d9cbf7144ec589a3f0cc91f74a1a1af2d2b14afa

Published CVSS scores

7.8kernel.orgCVSS:3.1/AV:L/AC:L/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

T1068Exploitation for Privilege Escalation

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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