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CVE-2026-53325— agp/amd64: Fix broken error propagation in agp_amd64_probe()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于agp_amd64_probe()函数中错误传播处理不当，驱动在未找到AMD北桥硬件时错误地检查返回值（仅检查等于-1而非小于0），导致初始化继续进行，最终在调用node_to_amd_nb(0)时因返回NULL而触发空指针取消引用。受影响版本：2.6.18版本。

AI Predicted 5.5 Difficulty: Easy EPSS 0.13% · P2

Possible ATT&CK Techniques 1 AI

T1564.004 · NTFS File Attributes

Affected Version Matrix 20

VendorProduct Version RangeStatus
Linux Linux a32073bffc656ca4bde6002b6cf7c1a8e0e22712< ce800993af477fc24187349c6a20d3073140b759 affected
a32073bffc656ca4bde6002b6cf7c1a8e0e22712< 1d7d45050e14083c1de1460c93f4063c1f0bca7b affected
a32073bffc656ca4bde6002b6cf7c1a8e0e22712< 3e844a63668d1c3d10a9d347d7ebf161b2f91c84 affected
a32073bffc656ca4bde6002b6cf7c1a8e0e22712< eb045714bc6a2bbb0befb7a31b996a196e188869 affected
a32073bffc656ca4bde6002b6cf7c1a8e0e22712< 564b3b3f6565313eb6fa5355ffd037d6fb27897f affected
a32073bffc656ca4bde6002b6cf7c1a8e0e22712< 53483a9f4ee9eeb18aa866ec16cce79e136987e1 affected
a32073bffc656ca4bde6002b6cf7c1a8e0e22712< 0aa9b27c454c53074cde592eaceb442d30341585 affected
a32073bffc656ca4bde6002b6cf7c1a8e0e22712< cefe535a60a2e00e09f4b2689b0c8ffc6912459a affected
… +12 more rows
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I. Basic Information for CVE-2026-53325

Vulnerability Information
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Vulnerability Title
agp/amd64: Fix broken error propagation in agp_amd64_probe()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: agp/amd64: Fix broken error propagation in agp_amd64_probe() A NULL pointer dereference was observed in the AMD64 AGP driver when running in a virtualized environment (e.g. qemu/kvm) without a physical AMD northbridge. The crash occurs in amd64_fetch_size() when attempting to dereference the pointer returned by node_to_amd_nb(0). The root cause of this crash is broken error propagation in agp_amd64_probe(): When no AMD northbridges are found, cache_nbs() correctly returns -ENODEV. However, the probe function erroneously checks the return value against exactly -1, rather than < 0. As a result, the hardware absence error is masked, allowing the driver to improperly proceed with initialization. It eventually calls agp_add_bridge(), which invokes amd64_fetch_size(). Since the hardware does not exist, node_to_amd_nb(0) returns NULL, leading to a General Protection Fault (GPF) when accessing its ->misc member. Fix the issue by correcting the error check in agp_amd64_probe() to abort properly when cache_nbs() returns any negative error code. This prevents the driver from erroneously proceeding without hardware, thereby avoiding the subsequent NULL pointer dereference at its source.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于agp_amd64_probe()函数中错误传播处理不当，驱动在未找到AMD北桥硬件时错误地检查返回值（仅检查等于-1而非小于0），导致初始化继续进行，最终在调用node_to_amd_nb(0)时因返回NULL而触发空指针取消引用。受影响版本：2.6.18版本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux a32073bffc656ca4bde6002b6cf7c1a8e0e22712 ~ ce800993af477fc24187349c6a20d3073140b759 -
Linux Linux 2.6.18 -

II. Public POCs for CVE-2026-53325

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III. Intelligence Information for CVE-2026-53325

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Patches & Fixes for CVE-2026-53325 (9)

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-53325

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