FKIE_CVE-2026-53325

Vulnerability from fkie_nvd - Published: 2026-06-29 06:16 - Updated: 2026-06-30 14:44
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0aa9b27c454c53074cde592eaceb442d30341585
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/53483a9f4ee9eeb18aa866ec16cce79e136987e1
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b08472db93b1ccff84a7adec5779d47f0e9d3a30
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cefe535a60a2e00e09f4b2689b0c8ffc6912459a
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/char/agp/amd64-agp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "53483a9f4ee9eeb18aa866ec16cce79e136987e1",
              "status": "affected",
              "version": "a32073bffc656ca4bde6002b6cf7c1a8e0e22712",
              "versionType": "git"
            },
            {
              "lessThan": "0aa9b27c454c53074cde592eaceb442d30341585",
              "status": "affected",
              "version": "a32073bffc656ca4bde6002b6cf7c1a8e0e22712",
              "versionType": "git"
            },
            {
              "lessThan": "cefe535a60a2e00e09f4b2689b0c8ffc6912459a",
              "status": "affected",
              "version": "a32073bffc656ca4bde6002b6cf7c1a8e0e22712",
              "versionType": "git"
            },
            {
              "lessThan": "b08472db93b1ccff84a7adec5779d47f0e9d3a30",
              "status": "affected",
              "version": "a32073bffc656ca4bde6002b6cf7c1a8e0e22712",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/char/agp/amd64-agp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.18"
            },
            {
              "lessThan": "2.6.18",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.37",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.14",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "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."
    }
  ],
  "id": "CVE-2026-53325",
  "lastModified": "2026-06-30T14:44:27.313",
  "metrics": {},
  "published": "2026-06-29T06:16:33.167",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0aa9b27c454c53074cde592eaceb442d30341585"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/53483a9f4ee9eeb18aa866ec16cce79e136987e1"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b08472db93b1ccff84a7adec5779d47f0e9d3a30"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/cefe535a60a2e00e09f4b2689b0c8ffc6912459a"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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