Vulnerability-Lookup

GHSA-VHJQ-V866-4C7F

Vulnerability from github – Published: 2026-06-29 06:31 – Updated: 2026-06-29 06:31

Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-53325"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-29T06:16:33Z",
    "severity": null
  },
  "details": "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": "GHSA-vhjq-v866-4c7f",
  "modified": "2026-06-29T06:31:49Z",
  "published": "2026-06-29T06:31:49Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53325"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0aa9b27c454c53074cde592eaceb442d30341585"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/53483a9f4ee9eeb18aa866ec16cce79e136987e1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b08472db93b1ccff84a7adec5779d47f0e9d3a30"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cefe535a60a2e00e09f4b2689b0c8ffc6912459a"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-53325 (GCVE-0-2026-53325)

Vulnerability from cvelistv5 – Published: 2026-06-29 04:53 – Updated: 2026-06-29 04:53

Title

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

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.

Severity

No CVSS data available.

Assigner

Linux

References

4 references

URL	Tags
https://git.kernel.org/stable/c/53483a9f4ee9eeb18…
https://git.kernel.org/stable/c/0aa9b27c454c53074…
https://git.kernel.org/stable/c/cefe535a60a2e00e0…
https://git.kernel.org/stable/c/b08472db93b1ccff8…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: a32073bffc656ca4bde6002b6cf7c1a8e0e22712 , < 53483a9f4ee9eeb18aa866ec16cce79e136987e1 (git) Affected: a32073bffc656ca4bde6002b6cf7c1a8e0e22712 , < 0aa9b27c454c53074cde592eaceb442d30341585 (git) Affected: a32073bffc656ca4bde6002b6cf7c1a8e0e22712 , < cefe535a60a2e00e09f4b2689b0c8ffc6912459a (git) Affected: a32073bffc656ca4bde6002b6cf7c1a8e0e22712 , < b08472db93b1ccff84a7adec5779d47f0e9d3a30 (git)
Linux	Linux	Affected: 2.6.18 Unaffected: 0 , < 2.6.18 (semver) Unaffected: 6.18.37 , ≤ 6.18.* (semver) Unaffected: 7.0.14 , ≤ 7.0.* (semver) Unaffected: 7.1.2 , ≤ 7.1.* (semver) Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/char/agp/amd64-agp.c"
          ],
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          "vendor": "Linux",
          "versions": [
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              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "0aa9b27c454c53074cde592eaceb442d30341585",
              "status": "affected",
              "version": "a32073bffc656ca4bde6002b6cf7c1a8e0e22712",
              "versionType": "git"
            },
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              "versionType": "git"
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              "status": "affected",
              "version": "a32073bffc656ca4bde6002b6cf7c1a8e0e22712",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "2.6.18"
            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "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"
            }
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        }
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      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.37",
                  "versionStartIncluding": "2.6.18",
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                },
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          "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."
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        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/b08472db93b1ccff84a7adec5779d47f0e9d3a30"
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    "cveId": "CVE-2026-53325",
    "datePublished": "2026-06-29T04:53:35.833Z",
    "dateReserved": "2026-06-09T07:44:35.398Z",
    "dateUpdated": "2026-06-29T04:53:35.833Z",
    "state": "PUBLISHED"
  },
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-VHJQ-V866-4C7F

CVE-2026-53325 (GCVE-0-2026-53325)

Tags

Sightings

Nomenclature