CVE-2026-64557

Kernel memory corruption via L2CAP socket race

Published Jul 29, 2026 · Updated Jul 29, 2026

Use-after-free in the Linux Kernel Bluetooth L2CAP subsystem allows physically proximate attackers to corrupt kernel memory via Bluetooth. l2cap_sock_new_connection_cb() drops the parent lock before returning the child channel, allowing another task to accept and free the exposed child socket before the callback dereferences it. Exploitation requires Bluetooth proximity and a concurrent accept and free of the child socket; the resulting kernel use-after-free permits memory corruption.

CVSS severity8.8
High
EPSS probability0.24%
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 the Linux Kernel Bluetooth L2CAP subsystem allows physically proximate attackers to corrupt kernel memory via Bluetooth. l2cap_sock_new_connection_cb() drops the parent lock before returning the child channel, allowing another task to accept and free the exposed child socket before the callback dereferences it. Exploitation requires Bluetooth proximity and a concurrent accept and free of the child socket; the resulting kernel use-after-free permits memory corruption.

The record

CVE
CVE-2026-64557
Published
Jul 29, 2026
Updated
Jul 29, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
Unavailable
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 29, 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=3.13
  2. Affected versionversion=8ffb929098a56939ac71509302eeab5b207bf262 <36da806f7fbaee56ad9e81859deec203f9728700
  3. Affected versionversion=8ffb929098a56939ac71509302eeab5b207bf262 <6fef032af0092ed5ccb767239a9ac1bc38c08a40
  4. Affected versionversion=8ffb929098a56939ac71509302eeab5b207bf262 <733e76e74e406c1d1ddc7369420dd8a47f48bb8a
  5. Affected versionversion=8ffb929098a56939ac71509302eeab5b207bf262 <84e718b6a814edc84159361f9f454a4e92ae91ae
  6. Affected versionversion=8ffb929098a56939ac71509302eeab5b207bf262 <8c37e4338c801ebb8cee52436c01c41e009f6e87
  7. Affected versionversion=8ffb929098a56939ac71509302eeab5b207bf262 <b39298044e5534612511a2ff5de03ba5f6e7a820

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=3.13; version=8ffb929098a56939ac71509302eeab5b207bf262 <36da806f7fbaee56ad9e81859deec203f9728700; version=8ffb929098a56939ac71509302eeab5b207bf262 <6fef032af0092ed5ccb767239a9ac1bc38c08a40; version=8ffb929098a56939ac71509302eeab5b207bf262 <733e76e74e406c1d1ddc7369420dd8a47f48bb8a; version=8ffb929098a56939ac71509302eeab5b207bf262 <84e718b6a814edc84159361f9f454a4e92ae91ae; version=8ffb929098a56939ac71509302eeab5b207bf262 <8c37e4338c801ebb8cee52436c01c41e009f6e87; version=8ffb929098a56939ac71509302eeab5b207bf262 <b39298044e5534612511a2ff5de03ba5f6e7a820

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

No sourced classifications are available.

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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