Vulnerability-Lookup

GHSA-MV47-6R4W-P28Q

Vulnerability from github – Published: 2026-10-06 09:31 – Updated: 2026-10-06 09:31

Details

In the Linux kernel, the following vulnerability has been resolved:

drm/amdkfd: Avoid integer underflow with ffs in EOP ring size calc

The low 6 bits of cp_hqd_eop_control store the base-2 logarithm of the EOP ring size. This was calculated as

ffs(q->eop_ring_buffer_size / sizeof(unsigned int)) - 1 - 1

But ffs can in theory return 1 or 0, so this could underflow (although in practice the ring buffer size cannot be less than 4096).

Change this to

ffs(q->eop_ring_buffer_size / sizeof(unsigned int) / 4)

using properties of logarithms.

(cherry picked from commit 4f18c56630383c14bfc6b2d65f88f2f895d2121a)

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{
  "affected": [],
  "aliases": [
    "CVE-2026-98176"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-06T09:17:59Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdkfd: Avoid integer underflow with ffs in EOP ring size calc\n\nThe low 6 bits of cp_hqd_eop_control store the base-2 logarithm\nof the EOP ring size. This was calculated as\n\nffs(q-\u003eeop_ring_buffer_size / sizeof(unsigned int)) - 1 - 1\n\nBut ffs can in theory return 1 or 0, so this could underflow\n(although in practice the ring buffer size cannot be less than 4096).\n\nChange this to\n\nffs(q-\u003eeop_ring_buffer_size / sizeof(unsigned int) / 4)\n\nusing properties of logarithms.\n\n(cherry picked from commit 4f18c56630383c14bfc6b2d65f88f2f895d2121a)",
  "id": "GHSA-mv47-6r4w-p28q",
  "modified": "2026-10-06T09:31:29Z",
  "published": "2026-10-06T09:31:29Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98176"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/82e1b8299c6da02ce02185c208d2fdf7572b5ea1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c883d0a132d430ef7ebb23fd94323be94d0fbdb8"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-98176 (GCVE-0-2026-98176)

Vulnerability from cvelistv5 – Published: 2026-10-06 08:44 – Updated: 2026-10-07 06:49

Title

drm/amdkfd: Avoid integer underflow with ffs in EOP ring size calc

Summary

In the Linux kernel, the following vulnerability has been resolved: drm/amdkfd: Avoid integer underflow with ffs in EOP ring size calc The low 6 bits of cp_hqd_eop_control store the base-2 logarithm of the EOP ring size. This was calculated as ffs(q->eop_ring_buffer_size / sizeof(unsigned int)) - 1 - 1 But ffs can in theory return 1 or 0, so this could underflow (although in practice the ring buffer size cannot be less than 4096). Change this to ffs(q->eop_ring_buffer_size / sizeof(unsigned int) / 4) using properties of logarithms. (cherry picked from commit 4f18c56630383c14bfc6b2d65f88f2f895d2121a)

Severity

No CVSS data available.

Assigner

Linux CNA under the mitre root

CNA scorecard D 54/100 over 6633 records in the last 180 days details

References

2 references

URL	Tags
https://git.kernel.org/stable/c/82e1b8299c6da02ce…
https://git.kernel.org/stable/c/c883d0a132d430ef7…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 14328aa58ce523a59996c5a82681c43ec048cc33 , < 82e1b8299c6da02ce02185c208d2fdf7572b5ea1 (git) Affected: 14328aa58ce523a59996c5a82681c43ec048cc33 , < c883d0a132d430ef7ebb23fd94323be94d0fbdb8 (git)
Linux	Linux	Affected: 5.3 Unaffected: 0 , < 5.3 (semver) Unaffected: 7.2.8 , ≤ 7.2.* (semver) Unaffected: 7.3-rc4 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/amdkfd/kfd_mqd_manager_v10.c",
            "drivers/gpu/drm/amd/amdkfd/kfd_mqd_manager_v11.c",
            "drivers/gpu/drm/amd/amdkfd/kfd_mqd_manager_v12.c",
            "drivers/gpu/drm/amd/amdkfd/kfd_mqd_manager_v12_1.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "82e1b8299c6da02ce02185c208d2fdf7572b5ea1",
              "status": "affected",
              "version": "14328aa58ce523a59996c5a82681c43ec048cc33",
              "versionType": "git"
            },
            {
              "lessThan": "c883d0a132d430ef7ebb23fd94323be94d0fbdb8",
              "status": "affected",
              "version": "14328aa58ce523a59996c5a82681c43ec048cc33",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/amdkfd/kfd_mqd_manager_v10.c",
            "drivers/gpu/drm/amd/amdkfd/kfd_mqd_manager_v11.c",
            "drivers/gpu/drm/amd/amdkfd/kfd_mqd_manager_v12.c",
            "drivers/gpu/drm/amd/amdkfd/kfd_mqd_manager_v12_1.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.3"
            },
            {
              "lessThan": "5.3",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc4",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.8",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc4",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdkfd: Avoid integer underflow with ffs in EOP ring size calc\n\nThe low 6 bits of cp_hqd_eop_control store the base-2 logarithm\nof the EOP ring size. This was calculated as\n\nffs(q-\u003eeop_ring_buffer_size / sizeof(unsigned int)) - 1 - 1\n\nBut ffs can in theory return 1 or 0, so this could underflow\n(although in practice the ring buffer size cannot be less than 4096).\n\nChange this to\n\nffs(q-\u003eeop_ring_buffer_size / sizeof(unsigned int) / 4)\n\nusing properties of logarithms.\n\n(cherry picked from commit 4f18c56630383c14bfc6b2d65f88f2f895d2121a)"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-07T06:49:25.687Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/82e1b8299c6da02ce02185c208d2fdf7572b5ea1"
        },
        {
          "url": "https://git.kernel.org/stable/c/c883d0a132d430ef7ebb23fd94323be94d0fbdb8"
        }
      ],
      "title": "drm/amdkfd: Avoid integer underflow with ffs in EOP ring size calc",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98176",
    "datePublished": "2026-10-06T08:44:20.004Z",
    "dateReserved": "2026-09-25T10:25:14.322Z",
    "dateUpdated": "2026-10-07T06:49:25.687Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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GHSA-MV47-6R4W-P28Q

CVE-2026-98176 (GCVE-0-2026-98176)

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