CVE-2026-53357

Kernel memory corruption via Bluetooth L2CAP race

Published Jul 2, 2026 · Updated Jul 2, 2026

Use-after-free in Linux Kernel Bluetooth L2CAP code allows local users to corrupt kernel memory through a raced HCI disconnect. bt_accept_dequeue() unlinks and unlocks an unaccepted child socket without retaining a caller reference, allowing l2cap_conn_del() to free the socket and channel before l2cap_sock_cleanup_listen() uses them. Exploitation requires an unprivileged L2CAP listen-and-close sequence coordinated with a nearby Bluetooth peer disconnect; bounded consequences are kernel-memory disclosure or modification and a system crash.

CVSS severity8.0
High
EPSS probability0.27%
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 code allows local users to corrupt kernel memory through a raced HCI disconnect. bt_accept_dequeue() unlinks and unlocks an unaccepted child socket without retaining a caller reference, allowing l2cap_conn_del() to free the socket and channel before l2cap_sock_cleanup_listen() uses them. Exploitation requires an unprivileged L2CAP listen-and-close sequence coordinated with a nearby Bluetooth peer disconnect; bounded consequences are kernel-memory disclosure or modification and a system crash.

The record

CVE
CVE-2026-53357
Published
Jul 2, 2026
Updated
Jul 2, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416
Attack vector
adjacent
Privileges
authenticated

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=15f02b91056253e8cdc592888f431da0731337b8 <407217734835d21d4e0105ebf347860dc1806f88
  2. Affected versionversion=15f02b91056253e8cdc592888f431da0731337b8 <5d86d2f1b4d9a508c441d3e45277ae1a73cfed57
  3. Affected versionversion=15f02b91056253e8cdc592888f431da0731337b8 <751de6ec671fe75ad9cf65a0638d2a06b6a5984d
  4. Affected versionversion=15f02b91056253e8cdc592888f431da0731337b8 <7eebd4c2c86f573af87ff165d08a83432eb0b919
  5. Affected versionversion=15f02b91056253e8cdc592888f431da0731337b8 <87c543e2f78d0871f271df92dab98901bbd5b6f5
  6. Affected versionversion=15f02b91056253e8cdc592888f431da0731337b8 <a5ca86a6097a8b030ca3226cd300b17ed330f966
  7. Affected versionversion=15f02b91056253e8cdc592888f431da0731337b8 <ab1513597c6cf17cd1ad2a21e3b045421b48e022
  8. Affected versionversion=15f02b91056253e8cdc592888f431da0731337b8 <added1213395071470a900cc845a042fb51882a6
  9. Affected versionversion=5.7

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=15f02b91056253e8cdc592888f431da0731337b8 <407217734835d21d4e0105ebf347860dc1806f88; version=15f02b91056253e8cdc592888f431da0731337b8 <5d86d2f1b4d9a508c441d3e45277ae1a73cfed57; version=15f02b91056253e8cdc592888f431da0731337b8 <751de6ec671fe75ad9cf65a0638d2a06b6a5984d; version=15f02b91056253e8cdc592888f431da0731337b8 <7eebd4c2c86f573af87ff165d08a83432eb0b919; version=15f02b91056253e8cdc592888f431da0731337b8 <87c543e2f78d0871f271df92dab98901bbd5b6f5; version=15f02b91056253e8cdc592888f431da0731337b8 <a5ca86a6097a8b030ca3226cd300b17ed330f966; version=15f02b91056253e8cdc592888f431da0731337b8 <ab1513597c6cf17cd1ad2a21e3b045421b48e022; version=15f02b91056253e8cdc592888f431da0731337b8 <added1213395071470a900cc845a042fb51882a6; version=5.7

Published CVSS scores

8.0kernel.orgCVSS:3.1/AV:A/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

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free

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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