CVE-2026-53256

Kernel memory corruption via unpinned RFCOMM listener

Published Jun 25, 2026 · Updated Jun 25, 2026

Use-after-free in Linux Kernel RFCOMM sockets allows local users with an adjacent Bluetooth peer to corrupt kernel memory through a race. rfcomm_get_sock_by_channel() drops the socket-list lock and returns a listener without taking a reference, so concurrent close can free it before rfcomm_connect_ind() locks, queues to, or notifies it. Exploitation requires low local privileges plus a Bluetooth peer within radio range; triggering the race can crash the kernel or enable kernel-memory compromise.

CVSS severity8.0
High
EPSS probability0.25%
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 RFCOMM sockets allows local users with an adjacent Bluetooth peer to corrupt kernel memory through a race. rfcomm_get_sock_by_channel() drops the socket-list lock and returns a listener without taking a reference, so concurrent close can free it before rfcomm_connect_ind() locks, queues to, or notifies it. Exploitation requires low local privileges plus a Bluetooth peer within radio range; triggering the race can crash the kernel or enable kernel-memory compromise.

The record

CVE
CVE-2026-53256
Published
Jun 25, 2026
Updated
Jun 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416, T1068
Attack vector
adjacent
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1f73f92f66251065a5f39b09a47cf05ea14d3107
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <43c441edacf953b39517a44f5e5e10a93618b226
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6f4462d12133106460d7c046b95aad2491e3fddf
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8802413ce63175fb522a2bd609fb043a3550c720
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a07d741c077d4e34b16458241a94d29039386553
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b0e33e409715c617e2a20f46f99aa5403a14dfda
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <de31973ef00e5aa55496f84cf6a44bb157a34e02
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f5ec76bdbeb80f75ad0be204371afffee0f8fac8
  9. Affected versionversion=2.6.12

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1f73f92f66251065a5f39b09a47cf05ea14d3107; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <43c441edacf953b39517a44f5e5e10a93618b226; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6f4462d12133106460d7c046b95aad2491e3fddf; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8802413ce63175fb522a2bd609fb043a3550c720; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a07d741c077d4e34b16458241a94d29039386553; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b0e33e409715c617e2a20f46f99aa5403a14dfda; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <de31973ef00e5aa55496f84cf6a44bb157a34e02; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f5ec76bdbeb80f75ad0be204371afffee0f8fac8; version=2.6.12

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

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1068Exploitation for Privilege Escalation

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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