CVE-2026-53116

Kernel memory corruption via unlocked driver_override access

Published Jun 24, 2026 · Updated Jun 24, 2026

Use-after-free in the s390 AP bus in Linux Kernel 6.19 through 7.0.9 allows local users to trigger memory corruption via concurrent sysfs writes. After ap_attr_mutex is released, __ap_revise_reserved() reads driver_override without a lock while driver_override_store() can free the same string. The race requires uid 0 or CAP_SYS_ADMIN on an s390 host; successful exploitation compromises kernel confidentiality, integrity, and availability.

CVSS severity7.8
High
EPSS probability0.11%
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 the s390 AP bus in Linux Kernel 6.19 through 7.0.9 allows local users to trigger memory corruption via concurrent sysfs writes. After ap_attr_mutex is released, __ap_revise_reserved() reads driver_override without a lock while driver_override_store() can free the same string. The race requires uid 0 or CAP_SYS_ADMIN on an s390 host; successful exploitation compromises kernel confidentiality, integrity, and availability.

The record

CVE
CVE-2026-53116
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Jun 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 24, 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=6.19
  2. Affected versionversion=d38a87d7c0643db61e7a3bfc3ebeea2dc2568f7e <81d6f7c3a70b10ff757ee8b5f8114a190871cf1e
  3. Affected versionversion=d38a87d7c0643db61e7a3bfc3ebeea2dc2568f7e <8f2eca0570438b94602da1297353eb7b10dcb6cb

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.19; version=d38a87d7c0643db61e7a3bfc3ebeea2dc2568f7e <81d6f7c3a70b10ff757ee8b5f8114a190871cf1e; version=d38a87d7c0643db61e7a3bfc3ebeea2dc2568f7e <8f2eca0570438b94602da1297353eb7b10dcb6cb

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8UbuntuCVSS:3.1/AV:L/AC:L/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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