CVE-2026-74536

Service interruption via Bluetooth ISO socket reference leak

Published Aug 15, 2026 · Updated Aug 15, 2026

Memory leak in the Linux kernel Bluetooth ISO subsystem allows adjacent attackers to interrupt service through repeated socket teardown. iso_sock_kill() returns early after sock_orphan() sets SOCK_DEAD, so iso_sock_destruct() never releases the socket reference; iso_conn_del() also omits cleanup after zapping. Bluetooth-adjacent, unauthenticated access is sufficient, and repeated connection teardown consumes kernel memory until service interruption.

CVSS severity6.5
Medium
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

Memory leak in the Linux kernel Bluetooth ISO subsystem allows adjacent attackers to interrupt service through repeated socket teardown. iso_sock_kill() returns early after sock_orphan() sets SOCK_DEAD, so iso_sock_destruct() never releases the socket reference; iso_conn_del() also omits cleanup after zapping. Bluetooth-adjacent, unauthenticated access is sufficient, and repeated connection teardown consumes kernel memory until service interruption.

The record

CVE
CVE-2026-74536
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 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=6.0
  2. Affected versionversion=ccf74f2390d60a2f9a75ef496d2564abb478f46a <96ed3c772c08e7a91c399567f412618e43231023
  3. Affected versionversion=ccf74f2390d60a2f9a75ef496d2564abb478f46a <ce57442a379212fe3fda59c9437ee8217eceb5b1
  4. Affected versionversion=ccf74f2390d60a2f9a75ef496d2564abb478f46a <e30e5ca63c8fbe3cd505fbb419bb547760cda633
  5. Affected versionversion=ccf74f2390d60a2f9a75ef496d2564abb478f46a <e76a0ae6542ae43241b2147bacf4990e7ae5316a

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.0; version=ccf74f2390d60a2f9a75ef496d2564abb478f46a <96ed3c772c08e7a91c399567f412618e43231023; version=ccf74f2390d60a2f9a75ef496d2564abb478f46a <ce57442a379212fe3fda59c9437ee8217eceb5b1; version=ccf74f2390d60a2f9a75ef496d2564abb478f46a <e30e5ca63c8fbe3cd505fbb419bb547760cda633; version=ccf74f2390d60a2f9a75ef496d2564abb478f46a <e76a0ae6542ae43241b2147bacf4990e7ae5316a

Published CVSS scores

6.5SUSECVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.5OracleCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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

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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