CVE-2026-98177 (GCVE-0-2026-98177)

Vulnerability from cvelistv5 – Published: 2026-10-06 08:44 – Updated: 2026-10-07 06:49
VLAI
Title
drm/amdkfd: Avoid integer underflow in EOP ring size calculation.
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/amdkfd: Avoid integer underflow in EOP ring size calculation. The low 6 bits of cp_hqd_eop_control store the base-2 logarithm of the EOP ring size. This was calculated as order_base_2(q->eop_ring_buffer_size / 4) - 1 But order_base_2 can in theory return 0, so this could underflow (although in practice the ring buffer size cannot be less than 4096). Change this to order_base_2(q->eop_ring_buffer_size / 8) using properties of logarithms. Also add to the above comment to make the mathematics more clear. (cherry picked from commit f0f43fcf8b2b3a924cad9444340921c96ed5f634)
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: d696d536f0a97ac779d6176107ac4e96d0a2f8b9 , < 287a34c4d712e0bdb67751e21316d9c8d75a528a (git)
Affected: d696d536f0a97ac779d6176107ac4e96d0a2f8b9 , < 8ee521b8b189799e361d4233c5180ba56656d4d4 (git)
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Linux Linux Affected: 4.3
Unaffected: 0 , < 4.3 (semver)
Unaffected: 7.2.8 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc4 , ≤ * (original_commit_for_fix)
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{
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      "affected": [
        {
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          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/amdkfd/kfd_mqd_manager_v9.c",
            "drivers/gpu/drm/amd/amdkfd/kfd_mqd_manager_vi.c"
          ],
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          ],
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          "vendor": "Linux",
          "versions": [
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              "version": "7.3-rc4",
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              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdkfd: Avoid integer underflow in EOP ring size calculation.\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\norder_base_2(q-\u003eeop_ring_buffer_size / 4) - 1\n\nBut order_base_2 can in theory return 0, so this could underflow\n(although in practice the ring buffer size cannot be less than 4096).\n\nChange this to\n\norder_base_2(q-\u003eeop_ring_buffer_size / 8)\n\nusing properties of logarithms.\n\nAlso add to the above comment to make the mathematics more clear.\n\n(cherry picked from commit f0f43fcf8b2b3a924cad9444340921c96ed5f634)"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-07T06:49:26.854Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/287a34c4d712e0bdb67751e21316d9c8d75a528a"
        },
        {
          "url": "https://git.kernel.org/stable/c/8ee521b8b189799e361d4233c5180ba56656d4d4"
        }
      ],
      "title": "drm/amdkfd: Avoid integer underflow in EOP ring size calculation.",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98177",
    "datePublished": "2026-10-06T08:44:20.807Z",
    "dateReserved": "2026-09-25T10:25:14.322Z",
    "dateUpdated": "2026-10-07T06:49:26.854Z",
    "state": "PUBLISHED"
  },
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      "percentile": "0.04101"
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    "nvd": {
      "cve": {
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                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "drivers/gpu/drm/amd/amdkfd/kfd_mqd_manager_v9.c",
                  "drivers/gpu/drm/amd/amdkfd/kfd_mqd_manager_vi.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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                  {
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                    "versionType": "git"
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                  "drivers/gpu/drm/amd/amdkfd/kfd_mqd_manager_vi.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
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                    "version": "0",
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                    "version": "7.2.8",
                    "versionType": "semver"
                  },
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                    "versionType": "original_commit_for_fix"
                  }
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              }
            ],
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          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdkfd: Avoid integer underflow in EOP ring size calculation.\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\norder_base_2(q-\u003eeop_ring_buffer_size / 4) - 1\n\nBut order_base_2 can in theory return 0, so this could underflow\n(although in practice the ring buffer size cannot be less than 4096).\n\nChange this to\n\norder_base_2(q-\u003eeop_ring_buffer_size / 8)\n\nusing properties of logarithms.\n\nAlso add to the above comment to make the mathematics more clear.\n\n(cherry picked from commit f0f43fcf8b2b3a924cad9444340921c96ed5f634)"
          }
        ],
        "id": "CVE-2026-98177",
        "lastModified": "2026-10-07T07:17:04.270",
        "metrics": {},
        "published": "2026-10-06T09:17:59.787",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
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      "current_release_date": "2026-10-08T15:01:39+00:00",
      "cve": "CVE-2026-98177",
      "id": "CVE-2026-98177",
      "initial_release_date": "2026-10-06T00:00:00+00:00",
      "product_status:known_affected": "249",
      "product_status:known_not_affected": "28",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: drm/amdkfd: Avoid integer underflow in EOP ring size calculation",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98177.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "low",
      "current_release_date": "2026-10-08T16:51:31Z",
      "cve": "CVE-2026-98177",
      "id": "CVE-2026-98177",
      "initial_release_date": "2026-10-08T16:51:31Z",
      "product_status:known_affected": "343",
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      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-98177",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-98177.json",
      "version": "2"
    }
  }
}



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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

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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.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.