CVE-2026-63946

Kernel memory corruption via Bluetooth ISO socket race

Published Jul 19, 2026 · Updated Jul 19, 2026

Use-after-free in Linux Kernel's Bluetooth ISO receive path allows physically proximate attackers to corrupt kernel memory with ISO traffic. iso_recv_frame drops iso_conn_lock after reading conn->sk without retaining a socket reference, so concurrent iso_sock_kill() can free the socket before state access or receive-queue insertion. An established ISO connection with a malicious Bluetooth LE device is sufficient; racing inbound frames against socket teardown can expose or alter kernel memory or crash the system.

CVSS severity8.8
High
EPSS probability0.34%
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

Use-after-free in Linux Kernel's Bluetooth ISO receive path allows physically proximate attackers to corrupt kernel memory with ISO traffic. iso_recv_frame drops iso_conn_lock after reading conn->sk without retaining a socket reference, so concurrent iso_sock_kill() can free the socket before state access or receive-queue insertion. An established ISO connection with a malicious Bluetooth LE device is sufficient; racing inbound frames against socket teardown can expose or alter kernel memory or crash the system.

The record

CVE
CVE-2026-63946
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1200
Attack vector
adjacent
Privileges
unauthenticated

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

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=6.0
  2. Affected versionversion=ccf74f2390d60a2f9a75ef496d2564abb478f46a <119fb6f80c44dc1c65d604cf28e64c56bd9b6568
  3. Affected versionversion=ccf74f2390d60a2f9a75ef496d2564abb478f46a <1a6b803b00ccdd7666506adbe01ddae1c72d1ca9
  4. Affected versionversion=ccf74f2390d60a2f9a75ef496d2564abb478f46a <47f23a259517abbdb8032c057a1e8a6bf3734878
  5. Affected versionversion=ccf74f2390d60a2f9a75ef496d2564abb478f46a <b04ec131325baf4ea4577d6c6e6b86cf092e3731
  6. Affected versionversion=ccf74f2390d60a2f9a75ef496d2564abb478f46a <c318aa51830a3d2cc1229968fe521441c97356cd
  7. Affected versionversion=ccf74f2390d60a2f9a75ef496d2564abb478f46a <c57ea90f203c8b8b41a474f19a09000d0f841436

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.0; version=ccf74f2390d60a2f9a75ef496d2564abb478f46a <119fb6f80c44dc1c65d604cf28e64c56bd9b6568; version=ccf74f2390d60a2f9a75ef496d2564abb478f46a <1a6b803b00ccdd7666506adbe01ddae1c72d1ca9; version=ccf74f2390d60a2f9a75ef496d2564abb478f46a <47f23a259517abbdb8032c057a1e8a6bf3734878; version=ccf74f2390d60a2f9a75ef496d2564abb478f46a <b04ec131325baf4ea4577d6c6e6b86cf092e3731; version=ccf74f2390d60a2f9a75ef496d2564abb478f46a <c318aa51830a3d2cc1229968fe521441c97356cd; version=ccf74f2390d60a2f9a75ef496d2564abb478f46a <c57ea90f203c8b8b41a474f19a09000d0f841436

Published CVSS scores

8.8Linux CNACVSS:3.1/AV:A/AC:L/PR:N/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.

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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1200Hardware Additions

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