CVE-2026-53325 (GCVE-0-2026-53325)
Vulnerability from cvelistv5
Published
2026-06-29 04:53
Modified
2026-08-17 04:50
Severity ?
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: a32073bffc656ca4bde6002b6cf7c1a8e0e22712
Version: a32073bffc656ca4bde6002b6cf7c1a8e0e22712
Version: a32073bffc656ca4bde6002b6cf7c1a8e0e22712
Version: a32073bffc656ca4bde6002b6cf7c1a8e0e22712
Version: a32073bffc656ca4bde6002b6cf7c1a8e0e22712
Version: a32073bffc656ca4bde6002b6cf7c1a8e0e22712
Version: a32073bffc656ca4bde6002b6cf7c1a8e0e22712
Version: a32073bffc656ca4bde6002b6cf7c1a8e0e22712
Version: a32073bffc656ca4bde6002b6cf7c1a8e0e22712
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{
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            "drivers/char/agp/amd64-agp.c"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nagp/amd64: Fix broken error propagation in agp_amd64_probe()\n\nA NULL pointer dereference was observed in the AMD64 AGP driver when\nrunning in a virtualized environment (e.g. qemu/kvm) without a physical\nAMD northbridge. The crash occurs in amd64_fetch_size() when attempting\nto dereference the pointer returned by node_to_amd_nb(0).\n\nThe root cause of this crash is broken error propagation in\nagp_amd64_probe(): When no AMD northbridges are found, cache_nbs()\ncorrectly returns -ENODEV. However, the probe function erroneously\nchecks the return value against exactly -1, rather than \u003c 0.\n\nAs a result, the hardware absence error is masked, allowing the driver\nto improperly proceed with initialization. It eventually calls\nagp_add_bridge(), which invokes amd64_fetch_size(). Since the hardware\ndoes not exist, node_to_amd_nb(0) returns NULL, leading to a General\nProtection Fault (GPF) when accessing its -\u003emisc member.\n\nFix the issue by correcting the error check in agp_amd64_probe() to\nabort properly when cache_nbs() returns any negative error code. This\nprevents the driver from erroneously proceeding without hardware, thereby\navoiding the subsequent NULL pointer dereference at its source."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T04:50:26.049Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ce800993af477fc24187349c6a20d3073140b759"
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          "url": "https://git.kernel.org/stable/c/1d7d45050e14083c1de1460c93f4063c1f0bca7b"
        },
        {
          "url": "https://git.kernel.org/stable/c/3e844a63668d1c3d10a9d347d7ebf161b2f91c84"
        },
        {
          "url": "https://git.kernel.org/stable/c/eb045714bc6a2bbb0befb7a31b996a196e188869"
        },
        {
          "url": "https://git.kernel.org/stable/c/564b3b3f6565313eb6fa5355ffd037d6fb27897f"
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        {
          "url": "https://git.kernel.org/stable/c/53483a9f4ee9eeb18aa866ec16cce79e136987e1"
        },
        {
          "url": "https://git.kernel.org/stable/c/0aa9b27c454c53074cde592eaceb442d30341585"
        },
        {
          "url": "https://git.kernel.org/stable/c/cefe535a60a2e00e09f4b2689b0c8ffc6912459a"
        },
        {
          "url": "https://git.kernel.org/stable/c/b08472db93b1ccff84a7adec5779d47f0e9d3a30"
        }
      ],
      "title": "agp/amd64: Fix broken error propagation in agp_amd64_probe()",
      "x_generator": {
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53325",
    "datePublished": "2026-06-29T04:53:35.833Z",
    "dateReserved": "2026-06-09T07:44:35.398Z",
    "dateUpdated": "2026-08-17T04:50:26.049Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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