CVE-2026-53358

Memory corruption via unlocked L2CAP channel removal

Published Jul 2, 2026 · Updated Jul 2, 2026

Improper locking in Linux Kernel allows remote attackers to corrupt kernel memory through nearby Bluetooth L2CAP traffic. cleanup_listen() calls l2cap_chan_close() without conn->lock, allowing concurrent removal from conn->chan_l during connection teardown. Bluetooth and a listening L2CAP service must be present; no OS account or user action is required, and exploitation can panic the kernel.

CVSS severity8.8
High
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper locking in Linux Kernel allows remote attackers to corrupt kernel memory through nearby Bluetooth L2CAP traffic. cleanup_listen() calls l2cap_chan_close() without conn->lock, allowing concurrent removal from conn->chan_l during connection teardown. Bluetooth and a listening L2CAP service must be present; no OS account or user action is required, and exploitation can panic the kernel.

The record

CVE
CVE-2026-53358
Published
Jul 2, 2026
Updated
Jul 2, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-667, T1499
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 2, 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=3.4
  2. Affected versionversion=3df91ea20e744344100b10ae69a17211fcf5b207 <3634cbdc2eb414b69ffa752ddbe5e0458518e321
  3. Affected versionversion=3df91ea20e744344100b10ae69a17211fcf5b207 <50dfec218808b148ab4247b1858031b7a32015c5
  4. Affected versionversion=3df91ea20e744344100b10ae69a17211fcf5b207 <7555fd885a0603f50e49a655850a1f2bd8a25398
  5. Affected versionversion=3df91ea20e744344100b10ae69a17211fcf5b207 <859d3ace791ed878ae9ba5522c7844d960da8f88
  6. Affected versionversion=3df91ea20e744344100b10ae69a17211fcf5b207 <89dec92041717b027216e110599e4f6d6c921b79
  7. Affected versionversion=3df91ea20e744344100b10ae69a17211fcf5b207 <8c8e620467a7b51562dbcefbd1f09f288d7d710d
  8. Affected versionversion=3df91ea20e744344100b10ae69a17211fcf5b207 <deb8493a8fa599f6c95e2465b12bfdfb7f94a1d9
  9. Affected versionversion=3df91ea20e744344100b10ae69a17211fcf5b207 <e1c100e2d61bd8c718b7d91fe3e050780a9bf72d

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=3.4; version=3df91ea20e744344100b10ae69a17211fcf5b207 <3634cbdc2eb414b69ffa752ddbe5e0458518e321; version=3df91ea20e744344100b10ae69a17211fcf5b207 <50dfec218808b148ab4247b1858031b7a32015c5; version=3df91ea20e744344100b10ae69a17211fcf5b207 <7555fd885a0603f50e49a655850a1f2bd8a25398; version=3df91ea20e744344100b10ae69a17211fcf5b207 <859d3ace791ed878ae9ba5522c7844d960da8f88; version=3df91ea20e744344100b10ae69a17211fcf5b207 <89dec92041717b027216e110599e4f6d6c921b79; version=3df91ea20e744344100b10ae69a17211fcf5b207 <8c8e620467a7b51562dbcefbd1f09f288d7d710d; version=3df91ea20e744344100b10ae69a17211fcf5b207 <deb8493a8fa599f6c95e2465b12bfdfb7f94a1d9; version=3df91ea20e744344100b10ae69a17211fcf5b207 <e1c100e2d61bd8c718b7d91fe3e050780a9bf72d

Published CVSS scores

8.8kernel.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-667Improper Locking
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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