CVE-2026-74537

Kernel use-after-free via unlocked socket dereference

Published Aug 15, 2026 · Updated Aug 15, 2026

Use-after-free in Bluetooth ISO socket handling in affected Linux releases allows adjacent remote attackers to dereference a freed socket. iso_conn_ready reads conn->sk without the connection lock or a retained socket reference, allowing iso_sock_release to clear and free the socket before lock_sock uses it. Reachability requires the connection-ready and socket-close paths to race; successful triggering can corrupt kernel memory or interrupt the system.

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 in Bluetooth ISO socket handling in affected Linux releases allows adjacent remote attackers to dereference a freed socket. iso_conn_ready reads conn->sk without the connection lock or a retained socket reference, allowing iso_sock_release to clear and free the socket before lock_sock uses it. Reachability requires the connection-ready and socket-close paths to race; successful triggering can corrupt kernel memory or interrupt the system.

The record

CVE
CVE-2026-74537
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=27c24fda62b601d6f9ca5e992502578c4310876f <0d255e63fcf3f13a570d7ac11678fa1164ac015c
  2. Affected versionversion=27c24fda62b601d6f9ca5e992502578c4310876f <1308d72903d792d10b82bc4ef08b8a4452308b04
  3. Affected versionversion=27c24fda62b601d6f9ca5e992502578c4310876f <4e9b5e8669b3602a4e01b6d1e9539b72e42c84d5
  4. Affected versionversion=5.15

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=27c24fda62b601d6f9ca5e992502578c4310876f <0d255e63fcf3f13a570d7ac11678fa1164ac015c; version=27c24fda62b601d6f9ca5e992502578c4310876f <1308d72903d792d10b82bc4ef08b8a4452308b04; version=27c24fda62b601d6f9ca5e992502578c4310876f <4e9b5e8669b3602a4e01b6d1e9539b72e42c84d5; version=5.15

Published CVSS scores

8.8OSVCVSS: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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