CVE-2026-74716

Local system crash via invalid PFN insertion

Published Aug 22, 2026 · Updated Aug 22, 2026

Reachable assertion in the Linux kernel allows local users to crash the system through an AMD XDNA GEM memory mapping. amdxdna_insert_pages() marks the VMA VM_MIXEDMAP, so a later fault inserts a valid system-memory PFN and triggers vmf_insert_pfn_prot()'s BUG_ON. An unprivileged process with access to the AMD XDNA device can reach the assertion by mapping a non-imported GEM object, discarding its PTEs with MADV_DONTNEED, and accessing it again.

CVSS severity5.5
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reachable assertion in the Linux kernel allows local users to crash the system through an AMD XDNA GEM memory mapping. amdxdna_insert_pages() marks the VMA VM_MIXEDMAP, so a later fault inserts a valid system-memory PFN and triggers vmf_insert_pfn_prot()'s BUG_ON. An unprivileged process with access to the AMD XDNA device can reach the assertion by mapping a non-imported GEM object, discarding its PTEs with MADV_DONTNEED, and accessing it again.

The record

CVE
CVE-2026-74716
Published
Aug 22, 2026
Updated
Aug 22, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-617, 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=6.16
  2. Affected versionversion=e486147c912f653ef4b60a6c7dbd4168a4c56a9f <13339132d89d00b513dff0730bff3a313b9b13b5
  3. Affected versionversion=e486147c912f653ef4b60a6c7dbd4168a4c56a9f <4a19f7ab5972ef608b31ae921419bc3e04b3f8ad

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.16; version=e486147c912f653ef4b60a6c7dbd4168a4c56a9f <13339132d89d00b513dff0730bff3a313b9b13b5; version=e486147c912f653ef4b60a6c7dbd4168a4c56a9f <4a19f7ab5972ef608b31ae921419bc3e04b3f8ad

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 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

CWE-617Reachable Assertion
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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