CVE-2026-74533

Use-after-free via unlocked ISO connection pointer

Published Aug 15, 2026 · Updated Aug 15, 2026

ISO use-after-free in Linux kernel 6.11.11 through 6.11.x and 6.12.2 through 6.13 allows physically proximate attackers to access freed memory. The iso_recv path reads hci_conn::iso_data without locking or RCU while iso_conn_put can clear and free the same connection before kref_get_unless_zero runs. Reachability requires Bluetooth ISO activity and a race between receive and teardown paths; the published record does not specify the resulting end effect.

CVSS severity8.8
High
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

ISO use-after-free in Linux kernel 6.11.11 through 6.11.x and 6.12.2 through 6.13 allows physically proximate attackers to access freed memory. The iso_recv path reads hci_conn::iso_data without locking or RCU while iso_conn_put can clear and free the same connection before kref_get_unless_zero runs. Reachability requires Bluetooth ISO activity and a race between receive and teardown paths; the published record does not specify the resulting end effect.

The record

CVE
CVE-2026-74533
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
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 <6.13
  3. Affected versionversion=6.13
  4. Affected versionversion=a58d0f5dac322e16cc75334d000666512341bde5
  5. Affected versionversion=dc26097bdb864a0d5955b9a25e43376ffc1af99b <876a3e94c70d0859d1dad1c986112d4f0d99eba8
  6. Affected versionversion=dc26097bdb864a0d5955b9a25e43376ffc1af99b <af24e338bf5dafb80f42baa9a0b9e9b57b1c5d9c
  7. 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 <6.13; version=6.13; version=a58d0f5dac322e16cc75334d000666512341bde5; version=dc26097bdb864a0d5955b9a25e43376ffc1af99b <876a3e94c70d0859d1dad1c986112d4f0d99eba8; version=dc26097bdb864a0d5955b9a25e43376ffc1af99b <af24e338bf5dafb80f42baa9a0b9e9b57b1c5d9c; version=f53e7489273dc2bb307bf50f319b3762d45534f0

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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