CVE-2026-53276

Local kernel memory corruption via Bluetooth ISO race

Published Jun 25, 2026 · Updated Jun 25, 2026

Use-after-free in Linux kernel 6.19 through 7.0.12 Bluetooth ISO allows local users to corrupt kernel memory through a socket race. The iso_sock_rebind_bc function caches the hci_conn pointer, drops the socket lock, and then dereferences bis->hdev after a concurrent close frees the connection. Local low-privileged access and a Bluetooth ISO socket are required; successful corruption exposes kernel data to unauthorized reading or modification or crashes the system.

CVSS severity7.8
High
EPSS probability0.17%
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 6.19 through 7.0.12 Bluetooth ISO allows local users to corrupt kernel memory through a socket race. The iso_sock_rebind_bc function caches the hci_conn pointer, drops the socket lock, and then dereferences bis->hdev after a concurrent close frees the connection. Local low-privileged access and a Bluetooth ISO socket are required; successful corruption exposes kernel data to unauthorized reading or modification or crashes the system.

The record

CVE
CVE-2026-53276
Published
Jun 25, 2026
Updated
Jun 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416
Attack vector
local
Privileges
Unavailable

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=6.19
  2. Affected versionversion=d3413703d5f8b7d1e6f514f9440ed5da1bc30796 <d324b8aa20bd3c3394e3647dc22491d88f3f4e7a
  3. Affected versionversion=d3413703d5f8b7d1e6f514f9440ed5da1bc30796 <f50331f2a1441ec49988832c3a95f2edacc47322

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.19; version=d3413703d5f8b7d1e6f514f9440ed5da1bc30796 <d324b8aa20bd3c3394e3647dc22491d88f3f4e7a; version=d3413703d5f8b7d1e6f514f9440ed5da1bc30796 <f50331f2a1441ec49988832c3a95f2edacc47322

Published CVSS scores

7.8kernel.orgCVSS:3.1/AV:L/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
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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