CVE-2026-23092

Kernel stack corruption via oversized debugfs write

Published Feb 4, 2026 · Updated Feb 4, 2026

Out-of-bounds write in Linux Kernel 6.16 through 6.18.7 allows local users to execute code in kernel context via debugfs commands. The ad3552r_hs_write_data_source function null-terminates a fixed 64-byte stack buffer at the requested count rather than the bytes copied. Exploitation requires high-privileged local code with CAP_SYS_ADMIN in the initial user namespace; affected 6.19 release candidates end at 6.19-rc6.

CVSS severity7.8
High
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Out-of-bounds write in Linux Kernel 6.16 through 6.18.7 allows local users to execute code in kernel context via debugfs commands. The ad3552r_hs_write_data_source function null-terminates a fixed 64-byte stack buffer at the requested count rather than the bytes copied. Exploitation requires high-privileged local code with CAP_SYS_ADMIN in the initial user namespace; affected 6.19 release candidates end at 6.19-rc6.

The record

CVE
CVE-2026-23092
Published
Feb 4, 2026
Updated
Feb 4, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-787, T1068
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Feb 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 4, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.16
  2. Affected versionversion=b1c5d68ea66e511dfb16cd0e6a730488bd3c3317 <978d28136c53df38f8f0b747191930e2f95e9084
  3. Affected versionversion=b1c5d68ea66e511dfb16cd0e6a730488bd3c3317 <db16e7c52032c79156930a337ee17232931794ba

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.16; version=b1c5d68ea66e511dfb16cd0e6a730488bd3c3317 <978d28136c53df38f8f0b747191930e2f95e9084; version=b1c5d68ea66e511dfb16cd0e6a730488bd3c3317 <db16e7c52032c79156930a337ee17232931794ba

Published CVSS scores

8.2TrendAI Zero Day InitiativeCVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
7.8NIST NVDCVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-787Out-of-bounds Write
T1068Exploitation for Privilege Escalation

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo