CVE-2026-74535

System hang or memory corruption via timer race

Published Aug 15, 2026 · Updated Aug 15, 2026

Use-after-free and deadlock in Linux kernel Bluetooth ISO allow physically proximate attackers to crash or hang the system via Bluetooth activity. The iso_sock_timeout function disables its timer while holding the socket lock and can race with iso_conn_del after hcon is freed. Bluetooth ISO connection teardown must overlap timeout handling; the documented outcomes are deadlock and kernel use-after-free.

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 and deadlock in Linux kernel Bluetooth ISO allow physically proximate attackers to crash or hang the system via Bluetooth activity. The iso_sock_timeout function disables its timer while holding the socket lock and can race with iso_conn_del after hcon is freed. Bluetooth ISO connection teardown must overlap timeout handling; the documented outcomes are deadlock and kernel use-after-free.

The record

CVE
CVE-2026-74535
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-825, 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=6.11.11 <6.12
  2. Affected versionversion=6.12.2 <6.12.103
  3. Affected versionversion=6.13
  4. Affected versionversion=a58d0f5dac322e16cc75334d000666512341bde5 <16d89a63e08280abeef7218970a3bbd7ca62b021
  5. Affected versionversion=dc26097bdb864a0d5955b9a25e43376ffc1af99b <200fa1629c57a3ca2b03d3ca63fd3a9bfd910c43
  6. Affected versionversion=dc26097bdb864a0d5955b9a25e43376ffc1af99b <3c3d5f85db80145636bb991a6005e2760012b985
  7. Affected versionversion=dc26097bdb864a0d5955b9a25e43376ffc1af99b <82e982f54f962f72646868ddbb2c3bd9ea178568
  8. Affected versionversion=f53e7489273dc2bb307bf50f319b3762d45534f0

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.11.11 <6.12; version=6.12.2 <6.12.103; version=6.13; version=a58d0f5dac322e16cc75334d000666512341bde5 <16d89a63e08280abeef7218970a3bbd7ca62b021; version=dc26097bdb864a0d5955b9a25e43376ffc1af99b <200fa1629c57a3ca2b03d3ca63fd3a9bfd910c43; version=dc26097bdb864a0d5955b9a25e43376ffc1af99b <3c3d5f85db80145636bb991a6005e2760012b985; version=dc26097bdb864a0d5955b9a25e43376ffc1af99b <82e982f54f962f72646868ddbb2c3bd9ea178568; version=f53e7489273dc2bb307bf50f319b3762d45534f0

Published CVSS scores

8.8CVE ProgramCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.0Red HatCVSS:3.1/AV:L/AC:H/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-825Expired Pointer Dereference
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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