CVE-2026-93072

Kernel crash via stale interrupt-chip callbacks

Published Sep 17, 2026 · Updated Sep 17, 2026

Use-after-free in Linux 4.4's renesas-irqc driver allows local users to crash the kernel via stale interrupt-chip callbacks. The interrupt domain lacks IRQ_DOMAIN_FLAG_DESTROY_GC, so driver removal leaks generic chips and leaves them on the global list. Exposure requires the affected driver to be removed before a suspend, resume, or shutdown callback accesses stale state; later kernel branches also contain the flaw, and the documented consequence is a kernel crash.

CVSS severity5.5
Medium
EPSS probability0.20%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Linux 4.4's renesas-irqc driver allows local users to crash the kernel via stale interrupt-chip callbacks. The interrupt domain lacks IRQ_DOMAIN_FLAG_DESTROY_GC, so driver removal leaks generic chips and leaves them on the global list. Exposure requires the affected driver to be removed before a suspend, resume, or shutdown callback accesses stale state; later kernel branches also contain the flaw, and the documented consequence is a kernel crash.

The record

CVE
CVE-2026-93072
Published
Sep 17, 2026
Updated
Sep 17, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-825, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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=4.4
  2. Affected versionversion=99c221df33fbfa1b30e15dee879eb0a9ae1be353 <3d39757ef791f90028da9c8b7c1fbbb497237e58
  3. Affected versionversion=99c221df33fbfa1b30e15dee879eb0a9ae1be353 <4bf7614d048434326081eef0ebef33cb77fe2ffc
  4. Affected versionversion=99c221df33fbfa1b30e15dee879eb0a9ae1be353 <616dd89d81ad9a3cf1cfff4088a4c43e4e00d6ba
  5. Affected versionversion=99c221df33fbfa1b30e15dee879eb0a9ae1be353 <7c614f83301d464e2fb498d63552490d137ea10d
  6. Affected versionversion=99c221df33fbfa1b30e15dee879eb0a9ae1be353 <9acc996cb2e8477ae81bd7c067fec15202d6bc89

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.4; version=99c221df33fbfa1b30e15dee879eb0a9ae1be353 <3d39757ef791f90028da9c8b7c1fbbb497237e58; version=99c221df33fbfa1b30e15dee879eb0a9ae1be353 <4bf7614d048434326081eef0ebef33cb77fe2ffc; version=99c221df33fbfa1b30e15dee879eb0a9ae1be353 <616dd89d81ad9a3cf1cfff4088a4c43e4e00d6ba; version=99c221df33fbfa1b30e15dee879eb0a9ae1be353 <7c614f83301d464e2fb498d63552490d137ea10d; version=99c221df33fbfa1b30e15dee879eb0a9ae1be353 <9acc996cb2e8477ae81bd7c067fec15202d6bc89

Published CVSS scores

5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.1Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-825Expired Pointer Dereference
T1499.004Application or System Exploitation

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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