CVE-2026-74729

Kernel crash via unsynchronized kfifo access

Published Aug 22, 2026 · Updated Aug 22, 2026

An out-of-bounds read in the Linux kernel Aspeed LPC snoop driver allows local users to crash the system through a kfifo race. The IRQ-side put_fifo_with_discard() updates the kfifo producer and consumer indexes without synchronizing with snoop_file_read(), allowing kfifo_copy_to_user() to read past its kmalloc-2k backing store. Exploitation requires an SMP system, local access to the snoop device, and concurrent IRQ activity; hardened usercopy aborts the unsafe copy with a kernel BUG.

CVSS severity5.5
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

An out-of-bounds read in the Linux kernel Aspeed LPC snoop driver allows local users to crash the system through a kfifo race. The IRQ-side put_fifo_with_discard() updates the kfifo producer and consumer indexes without synchronizing with snoop_file_read(), allowing kfifo_copy_to_user() to read past its kmalloc-2k backing store. Exploitation requires an SMP system, local access to the snoop device, and concurrent IRQ activity; hardened usercopy aborts the unsafe copy with a kernel BUG.

The record

CVE
CVE-2026-74729
Published
Aug 22, 2026
Updated
Aug 22, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 22, 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=3772e5da445420543b25825ac2b5971f3743f6e8 <131ab677b03349a5ae48da8722ec7075b37ec66e
  2. Affected versionversion=3772e5da445420543b25825ac2b5971f3743f6e8 <1acef6d85bfd98bd9dfe1f08bffa397a4dda8a6f
  3. Affected versionversion=4.19

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3772e5da445420543b25825ac2b5971f3743f6e8 <131ab677b03349a5ae48da8722ec7075b37ec66e; version=3772e5da445420543b25825ac2b5971f3743f6e8 <1acef6d85bfd98bd9dfe1f08bffa397a4dda8a6f; version=4.19

Published CVSS scores

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.

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

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

CWE-125Out-of-bounds Read
T1499.004Endpoint Denial of Service: Application 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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