CVE-2025-40161

Local kernel crash via incorrect SGI cleanup

Published Nov 12, 2025 · Updated May 11, 2026

Denial of service in the Linux kernel zynqmp-ipi mailbox driver allows local users to crash the kernel during device unbind. The driver treats interrupt numbers below 16 as SGIs, an assumption broken by dynamic IRQ allocation, and consequently releases SGI resources for an incorrectly classified interrupt. Reaching the fault requires local low-privileged access and a Xilinx ZynqMP system using the affected mailbox driver; the bounded consequence is a kernel crash.

CVSS severity6.9
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in the Linux kernel zynqmp-ipi mailbox driver allows local users to crash the kernel during device unbind. The driver treats interrupt numbers below 16 as SGIs, an assumption broken by dynamic IRQ allocation, and consequently releases SGI resources for an incorrectly classified interrupt. Reaching the fault requires local low-privileged access and a Xilinx ZynqMP system using the affected mailbox driver; the bounded consequence is a kernel crash.

The record

CVE
CVE-2025-40161
Published
Nov 12, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 12, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=6.10
  2. Affected versionversion=6ffb1635341bec50fa9540ae7827d1e5d75ae0b0 <1ee147efee68be00203b1fee6479911debb1edb2
  3. Affected versionversion=6ffb1635341bec50fa9540ae7827d1e5d75ae0b0 <32bf7c6e01f5ba17a53ba236a770bd0274cefdf4
  4. Affected versionversion=6ffb1635341bec50fa9540ae7827d1e5d75ae0b0 <bb160e791ab15b89188a7a19589b8e11f681bef3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.10; version=6ffb1635341bec50fa9540ae7827d1e5d75ae0b0 <1ee147efee68be00203b1fee6479911debb1edb2; version=6ffb1635341bec50fa9540ae7827d1e5d75ae0b0 <32bf7c6e01f5ba17a53ba236a770bd0274cefdf4; version=6ffb1635341bec50fa9540ae7827d1e5d75ae0b0 <bb160e791ab15b89188a7a19589b8e11f681bef3

Published CVSS scores

6.1SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
6.9SUSECVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N

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
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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