CVE-2026-53325

System crash via masked AGP probe failure

Published Jun 29, 2026 · Updated Jun 29, 2026

A NULL pointer dereference in the Linux kernel AMD64 AGP driver allows local users to crash a virtualized system during driver initialization. agp_amd64_probe() treats only -1 as failure, masks cache_nbs() returning -ENODEV, and continues into amd64_fetch_size(), which dereferences a NULL northbridge pointer. Reachability requires a virtualized AMD64 guest without a physical AMD northbridge; the bounded consequence is a General Protection Fault and system crash.

CVSS severity5.5
Medium
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A NULL pointer dereference in the Linux kernel AMD64 AGP driver allows local users to crash a virtualized system during driver initialization. agp_amd64_probe() treats only -1 as failure, masks cache_nbs() returning -ENODEV, and continues into amd64_fetch_size(), which dereferences a NULL northbridge pointer. Reachability requires a virtualized AMD64 guest without a physical AMD northbridge; the bounded consequence is a General Protection Fault and system crash.

The record

CVE
CVE-2026-53325
Published
Jun 29, 2026
Updated
Jun 29, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 29, 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=2.6.18
  2. Affected versionversion=a32073bffc656ca4bde6002b6cf7c1a8e0e22712 <0aa9b27c454c53074cde592eaceb442d30341585
  3. Affected versionversion=a32073bffc656ca4bde6002b6cf7c1a8e0e22712 <53483a9f4ee9eeb18aa866ec16cce79e136987e1
  4. Affected versionversion=a32073bffc656ca4bde6002b6cf7c1a8e0e22712 <b08472db93b1ccff84a7adec5779d47f0e9d3a30
  5. Affected versionversion=a32073bffc656ca4bde6002b6cf7c1a8e0e22712 <cefe535a60a2e00e09f4b2689b0c8ffc6912459a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=2.6.18; version=a32073bffc656ca4bde6002b6cf7c1a8e0e22712 <0aa9b27c454c53074cde592eaceb442d30341585; version=a32073bffc656ca4bde6002b6cf7c1a8e0e22712 <53483a9f4ee9eeb18aa866ec16cce79e136987e1; version=a32073bffc656ca4bde6002b6cf7c1a8e0e22712 <b08472db93b1ccff84a7adec5779d47f0e9d3a30; version=a32073bffc656ca4bde6002b6cf7c1a8e0e22712 <cefe535a60a2e00e09f4b2689b0c8ffc6912459a

Published CVSS scores

5.5NIST NVDCVSS: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.

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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-476NULL Pointer Dereference
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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