CVE-2026-64404

System crash via Bluetooth ISO teardown race

Published Jul 25, 2026 · Updated Jul 25, 2026

Race condition in the Bluetooth ISO subsystem in Linux Kernel 6.12.6 through 6.12.95 and 6.13 allows local users to crash the system. The iso_conn_big_sync() path drops the socket lock around hci_get_route(), then dereferences iso_pi(sk)->conn->hcon after reacquiring the lock without revalidating either pointer. A local user must reach iso_sock_recvmsg() through a PA-sync broadcast sink socket while controller-driven teardown clears the connection, producing a NULL dereference and kernel crash.

CVSS severity5.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Race condition in the Bluetooth ISO subsystem in Linux Kernel 6.12.6 through 6.12.95 and 6.13 allows local users to crash the system. The iso_conn_big_sync() path drops the socket lock around hci_get_route(), then dereferences iso_pi(sk)->conn->hcon after reacquiring the lock without revalidating either pointer. A local user must reach iso_sock_recvmsg() through a PA-sync broadcast sink socket while controller-driven teardown clears the connection, producing a NULL dereference and kernel crash.

The record

CVE
CVE-2026-64404
Published
Jul 25, 2026
Updated
Jul 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=6.12.6 <6.12.96
  2. Affected versionversion=6.13
  3. Affected versionversion=7a17308c17880d259105f6e591eb1bc77b9612f0 <01afd198c2c286cd3b81f44d4e33a2e638711550
  4. Affected versionversion=7a17308c17880d259105f6e591eb1bc77b9612f0 <b84eeb7636d6962dd882d5e0b31475e4f404313c
  5. Affected versionversion=7a17308c17880d259105f6e591eb1bc77b9612f0 <d5541eb148da72d5e0a1bca8ecd171f9fc8b366f
  6. Affected versionversion=cbe640d6cae590b9a7d81ce86fe9a90e83eec1d5 <b3e647a4aa4d2d054f86a783f5c426035e1dc237

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.12.6 <6.12.96; version=6.13; version=7a17308c17880d259105f6e591eb1bc77b9612f0 <01afd198c2c286cd3b81f44d4e33a2e638711550; version=7a17308c17880d259105f6e591eb1bc77b9612f0 <b84eeb7636d6962dd882d5e0b31475e4f404313c; version=7a17308c17880d259105f6e591eb1bc77b9612f0 <d5541eb148da72d5e0a1bca8ecd171f9fc8b366f; version=cbe640d6cae590b9a7d81ce86fe9a90e83eec1d5 <b3e647a4aa4d2d054f86a783f5c426035e1dc237

Published CVSS scores

5.5Red HatCVSS: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 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-476NULL Pointer Dereference
T1499Endpoint Denial of Service

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo