CVE-2026-64434

Kernel crash or code execution via L2CAP use-after-free

Published Jul 25, 2026 · Updated Jul 25, 2026

Use-after-free in Linux Kernel Bluetooth L2CAP allows physically proximate attackers to crash the kernel via connection teardown. The asynchronous l2cap_chan_timeout worker locks chan->conn after teardown frees the connection because the channel did not retain a connection reference. The race requires teardown while the timeout is running or pending, and the resulting memory corruption permits arbitrary code execution.

CVSS severity8.8
High
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Linux Kernel Bluetooth L2CAP allows physically proximate attackers to crash the kernel via connection teardown. The asynchronous l2cap_chan_timeout worker locks chan->conn after teardown frees the connection because the channel did not retain a connection reference. The race requires teardown while the timeout is running or pending, and the resulting memory corruption permits arbitrary code execution.

The record

CVE
CVE-2026-64434
Published
Jul 25, 2026
Updated
Jul 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-364, T1499
Attack vector
adjacent
Privileges
unauthenticated

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

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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=3634cbdc2eb414b69ffa752ddbe5e0458518e321
  2. Affected versionversion=50dfec218808b148ab4247b1858031b7a32015c5 <0b0e2bf39cf99e458d991b9df253727e036a7d7d
  3. Affected versionversion=5.10.259 <5.11
  4. Affected versionversion=5.15.210 <5.16
  5. Affected versionversion=6.1.176 <6.2
  6. Affected versionversion=6.12.93 <6.12.97
  7. Affected versionversion=6.18.35 <6.18.39
  8. Affected versionversion=6.6.143 <6.6.145
  9. Affected versionversion=7.0.12 <7.1
  10. Affected versionversion=7.1
  11. Affected versionversion=7555fd885a0603f50e49a655850a1f2bd8a25398
  12. Affected versionversion=859d3ace791ed878ae9ba5522c7844d960da8f88 <d3b739db5dc6f688a60d56da872fabaf65246032
  13. Affected versionversion=89dec92041717b027216e110599e4f6d6c921b79 <91047a4396a8b1857a6f712a90cf33ec0012b189
  14. Affected versionversion=8c8e620467a7b51562dbcefbd1f09f288d7d710d <50c38d9f42a529691e4e67ea9cedf4f0bfc8d277
  15. Affected versionversion=8c8e620467a7b51562dbcefbd1f09f288d7d710d <b66774b48dd98f07254951f74ea6f513efe7ff8b
  16. Affected versionversion=deb8493a8fa599f6c95e2465b12bfdfb7f94a1d9
  17. Affected versionversion=e1c100e2d61bd8c718b7d91fe3e050780a9bf72d

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=3634cbdc2eb414b69ffa752ddbe5e0458518e321; version=50dfec218808b148ab4247b1858031b7a32015c5 <0b0e2bf39cf99e458d991b9df253727e036a7d7d; version=5.10.259 <5.11; version=5.15.210 <5.16; version=6.1.176 <6.2; version=6.12.93 <6.12.97; version=6.18.35 <6.18.39; version=6.6.143 <6.6.145; version=7.0.12 <7.1; version=7.1; version=7555fd885a0603f50e49a655850a1f2bd8a25398; version=859d3ace791ed878ae9ba5522c7844d960da8f88 <d3b739db5dc6f688a60d56da872fabaf65246032; version=89dec92041717b027216e110599e4f6d6c921b79 <91047a4396a8b1857a6f712a90cf33ec0012b189; version=8c8e620467a7b51562dbcefbd1f09f288d7d710d <50c38d9f42a529691e4e67ea9cedf4f0bfc8d277; version=8c8e620467a7b51562dbcefbd1f09f288d7d710d <b66774b48dd98f07254951f74ea6f513efe7ff8b; version=deb8493a8fa599f6c95e2465b12bfdfb7f94a1d9; version=e1c100e2d61bd8c718b7d91fe3e050780a9bf72d

Published CVSS scores

7.0Red HatCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
8.8cve.orgCVSS: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.

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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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-364Signal Handler Race Condition
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

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Your stack

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