agp/amd64: Fix broken error propagation in agp_amd64_probe()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-53325
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-29 06:16:33 UTC
Updated2026-07-06 20:09:56 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.002030000 probability, percentile 0.103720000 (date 2026-07-05)

Problem Types: CWE-476

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected a32073bffc656ca4bde6002b6cf7c1a8e0e22712 ce800993af477fc24187349c6a20d3073140b759 git Not specified
CNA Linux Linux affected a32073bffc656ca4bde6002b6cf7c1a8e0e22712 1d7d45050e14083c1de1460c93f4063c1f0bca7b git Not specified
CNA Linux Linux affected a32073bffc656ca4bde6002b6cf7c1a8e0e22712 3e844a63668d1c3d10a9d347d7ebf161b2f91c84 git Not specified
CNA Linux Linux affected a32073bffc656ca4bde6002b6cf7c1a8e0e22712 eb045714bc6a2bbb0befb7a31b996a196e188869 git Not specified
CNA Linux Linux affected a32073bffc656ca4bde6002b6cf7c1a8e0e22712 564b3b3f6565313eb6fa5355ffd037d6fb27897f git Not specified
CNA Linux Linux affected a32073bffc656ca4bde6002b6cf7c1a8e0e22712 53483a9f4ee9eeb18aa866ec16cce79e136987e1 git Not specified
CNA Linux Linux affected a32073bffc656ca4bde6002b6cf7c1a8e0e22712 0aa9b27c454c53074cde592eaceb442d30341585 git Not specified
CNA Linux Linux affected a32073bffc656ca4bde6002b6cf7c1a8e0e22712 cefe535a60a2e00e09f4b2689b0c8ffc6912459a git Not specified
CNA Linux Linux affected a32073bffc656ca4bde6002b6cf7c1a8e0e22712 b08472db93b1ccff84a7adec5779d47f0e9d3a30 git Not specified
CNA Linux Linux affected 2.6.18 Not specified
CNA Linux Linux unaffected 2.6.18 semver Not specified
CNA Linux Linux unaffected 5.10.260 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.211 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.177 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.144 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.95 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.37 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.14 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1.2 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/eb045714bc6a2bbb0befb7a31b996a196e188869 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/ce800993af477fc24187349c6a20d3073140b759 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/53483a9f4ee9eeb18aa866ec16cce79e136987e1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/564b3b3f6565313eb6fa5355ffd037d6fb27897f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/3e844a63668d1c3d10a9d347d7ebf161b2f91c84 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/b08472db93b1ccff84a7adec5779d47f0e9d3a30 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/1d7d45050e14083c1de1460c93f4063c1f0bca7b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/0aa9b27c454c53074cde592eaceb442d30341585 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/cefe535a60a2e00e09f4b2689b0c8ffc6912459a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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