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

Vulnerability from cvelistv5 – Published: 2026-06-29 04:53 – Updated: 2026-07-04 11:51
VLAI
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
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: a32073bffc656ca4bde6002b6cf7c1a8e0e22712 , < ce800993af477fc24187349c6a20d3073140b759 (git)
Affected: a32073bffc656ca4bde6002b6cf7c1a8e0e22712 , < 1d7d45050e14083c1de1460c93f4063c1f0bca7b (git)
Affected: a32073bffc656ca4bde6002b6cf7c1a8e0e22712 , < 3e844a63668d1c3d10a9d347d7ebf161b2f91c84 (git)
Affected: a32073bffc656ca4bde6002b6cf7c1a8e0e22712 , < eb045714bc6a2bbb0befb7a31b996a196e188869 (git)
Affected: a32073bffc656ca4bde6002b6cf7c1a8e0e22712 , < 564b3b3f6565313eb6fa5355ffd037d6fb27897f (git)
Affected: a32073bffc656ca4bde6002b6cf7c1a8e0e22712 , < 53483a9f4ee9eeb18aa866ec16cce79e136987e1 (git)
Affected: a32073bffc656ca4bde6002b6cf7c1a8e0e22712 , < 0aa9b27c454c53074cde592eaceb442d30341585 (git)
Affected: a32073bffc656ca4bde6002b6cf7c1a8e0e22712 , < cefe535a60a2e00e09f4b2689b0c8ffc6912459a (git)
Affected: a32073bffc656ca4bde6002b6cf7c1a8e0e22712 , < b08472db93b1ccff84a7adec5779d47f0e9d3a30 (git)
Create a notification for this product.
Linux Linux Affected: 2.6.18
Unaffected: 0 , < 2.6.18 (semver)
Unaffected: 5.10.260 , ≤ 5.10.* (semver)
Unaffected: 5.15.211 , ≤ 5.15.* (semver)
Unaffected: 6.1.177 , ≤ 6.1.* (semver)
Unaffected: 6.6.144 , ≤ 6.6.* (semver)
Unaffected: 6.12.95 , ≤ 6.12.* (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)
Create a notification for this product.
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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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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          "url": "https://git.kernel.org/stable/c/b08472db93b1ccff84a7adec5779d47f0e9d3a30"
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      "source": "Microsoft CSAF VEX",
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      "title": "agp/amd64: Fix broken error propagation in agp_amd64_probe()",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-53325.json",
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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 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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-07-06T20:30:18+00:00",
      "cve": "CVE-2026-53325",
      "id": "CVE-2026-53325",
      "initial_release_date": "2026-06-29T00:00:00+00:00",
      "product_status:known_affected": "42",
      "product_status:known_not_affected": "232",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: agp/amd64: Fix broken error propagation in agp_amd64_probe()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53325.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-12T16:28:05Z",
      "cve": "CVE-2026-53325",
      "id": "CVE-2026-53325",
      "initial_release_date": "2026-06-30T01:42:36Z",
      "product_status:first_fixed": "68",
      "product_status:known_affected": "579",
      "product_status:known_not_affected": "29",
      "product_status:recommended": "201",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-53325",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-53325.json",
      "version": "7"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.