CVE-2026-89774Hinoki check available

Kernel use-after-free via unlocked SCO socket

Published Sep 16, 2026 · Updated Sep 16, 2026

Use-after-free in Linux 5.15 and affected commits allows attackers to access a freed Bluetooth SCO socket during connection setup. The sco_conn_ready function dereferences conn->sk and a listening parent socket without holding a reference or the required lock while another task can close and free either socket. Triggering the race requires concurrent SCO connection readiness and socket closure; the disclosure establishes a kernel memory-safety violation but does not document code execution or a reliable crash.

CVSS severityUnavailable
Unscored
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Use-after-free in Linux 5.15 and affected commits allows attackers to access a freed Bluetooth SCO socket during connection setup. The sco_conn_ready function dereferences conn->sk and a listening parent socket without holding a reference or the required lock while another task can close and free either socket. Triggering the race requires concurrent SCO connection readiness and socket closure; the disclosure establishes a kernel memory-safety violation but does not document code execution or a reliable crash.

The record

CVE
CVE-2026-89774
Published
Sep 16, 2026
Updated
Sep 16, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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 <4e37f6452d586b95c346a9abdd2fb80b67794f39
  2. Affected versionversion=27c24fda62b601d6f9ca5e992502578c4310876f <50aae396dc30377bec8e3b181b8346f8fd38f7d8
  3. Affected versionversion=27c24fda62b601d6f9ca5e992502578c4310876f <6e3840578aaad1a296aab1eaaa89ea3b7d5cbae1
  4. Affected versionversion=27c24fda62b601d6f9ca5e992502578c4310876f <7199c78c3a3e399a4dc439d845826793880ccedc
  5. Affected versionversion=27c24fda62b601d6f9ca5e992502578c4310876f <73cb063f5ec6ca51eb1e246c6d332563002ac277
  6. Affected versionversion=27c24fda62b601d6f9ca5e992502578c4310876f <d141d9b769bcd1b747898528c5023270cda040f2
  7. Affected versionversion=5.15

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=27c24fda62b601d6f9ca5e992502578c4310876f <4e37f6452d586b95c346a9abdd2fb80b67794f39; version=27c24fda62b601d6f9ca5e992502578c4310876f <50aae396dc30377bec8e3b181b8346f8fd38f7d8; version=27c24fda62b601d6f9ca5e992502578c4310876f <6e3840578aaad1a296aab1eaaa89ea3b7d5cbae1; version=27c24fda62b601d6f9ca5e992502578c4310876f <7199c78c3a3e399a4dc439d845826793880ccedc; version=27c24fda62b601d6f9ca5e992502578c4310876f <73cb063f5ec6ca51eb1e246c6d332563002ac277; version=27c24fda62b601d6f9ca5e992502578c4310876f <d141d9b769bcd1b747898528c5023270cda040f2; version=5.15

Published CVSS scores

No CVSS assessment is available in this record.

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)
Vectorlocal
PrivilegesUnavailable
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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