CVE-2026-89942Hinoki check available

Kernel crash via anonymous-buffer mutex use-after-free

Published Sep 16, 2026 · Updated Sep 16, 2026

Use-after-free in Linux 6.11's IIO anonymous-buffer release path allows local users to crash the kernel during device removal. The release path calls iio_device_put() while the buffer mutex guard remains active, so the final reference can free the mutex before it is unlocked. Exploitation requires access to an anonymous IIO buffer handle that retains the final device reference while the device is unbound or hot-unplugged.

CVSS severityUnavailable
Unscored
EPSS probabilityUnavailable
No score available in this record
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Use-after-free in Linux 6.11's IIO anonymous-buffer release path allows local users to crash the kernel during device removal. The release path calls iio_device_put() while the buffer mutex guard remains active, so the final reference can free the mutex before it is unlocked. Exploitation requires access to an anonymous IIO buffer handle that retains the final device reference while the device is unbound or hot-unplugged.

The record

CVE
CVE-2026-89942
Published
Sep 16, 2026
Updated
Sep 16, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

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?

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  1. Affected versionversion=3e26d9f08fbe0b73e951a5e810fdb7a332b7e37f <6288b593e76eb10329326f2cd51e32557203b9e5
  2. Affected versionversion=3e26d9f08fbe0b73e951a5e810fdb7a332b7e37f <6d4bdbf7bad63e759bf20259c527f69a1209e3dd
  3. Affected versionversion=3e26d9f08fbe0b73e951a5e810fdb7a332b7e37f <ab53077511cde811bf3ee219426c522329c41226
  4. Affected versionversion=3e26d9f08fbe0b73e951a5e810fdb7a332b7e37f <f1f8f0e8e0af9cae8150658dc7bb51332f984893
  5. Affected versionversion=6.11

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3e26d9f08fbe0b73e951a5e810fdb7a332b7e37f <6288b593e76eb10329326f2cd51e32557203b9e5; version=3e26d9f08fbe0b73e951a5e810fdb7a332b7e37f <6d4bdbf7bad63e759bf20259c527f69a1209e3dd; version=3e26d9f08fbe0b73e951a5e810fdb7a332b7e37f <ab53077511cde811bf3ee219426c522329c41226; version=3e26d9f08fbe0b73e951a5e810fdb7a332b7e37f <f1f8f0e8e0af9cae8150658dc7bb51332f984893; version=6.11

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
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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