Vulnerability-Lookup

GHSA-PG6J-5V22-GVQF

Vulnerability from github – Published: 2026-07-19 18:31 – Updated: 2026-07-20 15:31

Details

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

drm/amdkfd: fix a vulnerability of integer overflow in kfd debugger

get_queue_ids() computes array_size = num_queues * sizeof(uint32_t), which could overflow on 32-bit size_t build. using array_size() instead, it saturates to SIZE_MAX on overflow.

(cherry picked from commit 2d57a0475f085c08b49312dfd8edcb461845f285)

Severity

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-63881"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-19T16:17:05Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdkfd: fix a vulnerability of integer overflow in kfd debugger\n\nget_queue_ids() computes array_size = num_queues * sizeof(uint32_t),\nwhich could overflow on 32-bit size_t build. using array_size()\ninstead, it saturates to SIZE_MAX on overflow.\n\n(cherry picked from commit 2d57a0475f085c08b49312dfd8edcb461845f285)",
  "id": "GHSA-pg6j-5v22-gvqf",
  "modified": "2026-07-20T15:31:49Z",
  "published": "2026-07-19T18:31:43Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63881"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4e5f808b454167cc58d7084a407a554d8ddc694d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4f9eeedc3d3151f8a226fd676c314a813edda5a1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5cf4a41aa0d74e4c83f82d2ce233b5189ed4b43c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/93f5534b35a05ef8a0109c1eefa800062fee810a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/de70a80992396ee306ee3a2810ad28aa1608ba9b"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-63881 (GCVE-0-2026-63881)

Vulnerability from cvelistv5 – Published: 2026-07-19 14:54 – Updated: 2026-08-05 12:36

Title

drm/amdkfd: fix a vulnerability of integer overflow in kfd debugger

Summary

In the Linux kernel, the following vulnerability has been resolved: drm/amdkfd: fix a vulnerability of integer overflow in kfd debugger get_queue_ids() computes array_size = num_queues * sizeof(uint32_t), which could overflow on 32-bit size_t build. using array_size() instead, it saturates to SIZE_MAX on overflow. (cherry picked from commit 2d57a0475f085c08b49312dfd8edcb461845f285)

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root

References

5 references

URL	Tags
https://git.kernel.org/stable/c/4e5f808b454167cc5…
https://git.kernel.org/stable/c/de70a80992396ee30…
https://git.kernel.org/stable/c/5cf4a41aa0d74e4c8…
https://git.kernel.org/stable/c/4f9eeedc3d3151f8a…
https://git.kernel.org/stable/c/93f5534b35a05ef8a…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: a70a93fa568b4f05aba548dadb673703eccf5480 , < 4e5f808b454167cc58d7084a407a554d8ddc694d (git) Affected: a70a93fa568b4f05aba548dadb673703eccf5480 , < de70a80992396ee306ee3a2810ad28aa1608ba9b (git) Affected: a70a93fa568b4f05aba548dadb673703eccf5480 , < 5cf4a41aa0d74e4c83f82d2ce233b5189ed4b43c (git) Affected: a70a93fa568b4f05aba548dadb673703eccf5480 , < 4f9eeedc3d3151f8a226fd676c314a813edda5a1 (git) Affected: a70a93fa568b4f05aba548dadb673703eccf5480 , < 93f5534b35a05ef8a0109c1eefa800062fee810a (git)
Linux	Linux	Affected: 6.5 Unaffected: 0 , < 6.5 (semver) Unaffected: 6.6.143 , ≤ 6.6.* (semver) Unaffected: 6.12.93 , ≤ 6.12.* (semver) Unaffected: 6.18.35 , ≤ 6.18.* (semver) Unaffected: 7.0.12 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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          "versions": [
            {
              "lessThan": "4e5f808b454167cc58d7084a407a554d8ddc694d",
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              "versionType": "git"
            },
            {
              "lessThan": "de70a80992396ee306ee3a2810ad28aa1608ba9b",
              "status": "affected",
              "version": "a70a93fa568b4f05aba548dadb673703eccf5480",
              "versionType": "git"
            },
            {
              "lessThan": "5cf4a41aa0d74e4c83f82d2ce233b5189ed4b43c",
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              "versionType": "git"
            },
            {
              "lessThan": "4f9eeedc3d3151f8a226fd676c314a813edda5a1",
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              "versionType": "git"
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            {
              "lessThan": "93f5534b35a05ef8a0109c1eefa800062fee810a",
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              "versionType": "git"
            }
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        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c"
          ],
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          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.5"
            },
            {
              "lessThan": "6.5",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.143",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.93",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.35",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.12",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.143",
                  "versionStartIncluding": "6.5",
                  "vulnerable": true
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "6.5",
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                {
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                  "versionEndExcluding": "7.1",
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdkfd: fix a vulnerability of integer overflow in kfd debugger\n\nget_queue_ids() computes array_size = num_queues * sizeof(uint32_t),\nwhich could overflow on 32-bit size_t build. using array_size()\ninstead, it saturates to SIZE_MAX on overflow.\n\n(cherry picked from commit 2d57a0475f085c08b49312dfd8edcb461845f285)"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - Exploitation requires a local `ioctl()` on `/dev/kfd` via `AMDKFD_IOC_DBG_TRAP` with `KFD_IOC_DBG_TRAP_SUSPEND_QUEUES` or `KFD_IOC_DBG_TRAP_RESUME_QUEUES`; there is no network, adjacent-radio, or physical-access path to the vulnerable code.\nAC:L - On affected 32-bit `size_t` kernel builds, an attacker fully controls `num_queues` in the ioctl and can reliably force the multiply overflow (e.g. `num_queues \u003e= 0x40000001`) to trigger undersized `memdup_user()` followed by unbounded kernel heap corruption.\nPR:L - A local unprivileged user with AMDGPU/KFD device access can open `/dev/kfd`, enable the debug runtime and debug trap on their own process (no ptrace or root required), then invoke suspend/resume with a malicious `num_queues` value.\nUI:N - Exploitation is achieved entirely through attacker-initiated ioctl calls in an established KFD debug session; no victim interaction is required.\nS:U - Impact is kernel heap corruption and potential local privilege escalation within the same kernel security boundary, not a cross-boundary escape such as VM guest-to-host or IOMMU bypass.\nC:H - The integer overflow causes a heap buffer far smaller than `num_queues`, and subsequent `q_array_get_index()`/`copy_to_user()` operations perform out-of-bounds kernel reads that can disclose adjacent heap memory and be leveraged for arbitrary read primitives.\nI:H - `q_array_invalidate()` and per-queue status updates write attacker-influenced values (`KFD_DBG_QUEUE_INVALID_MASK`/`KFD_DBG_QUEUE_ERROR_MASK`) far beyond the allocated buffer, constituting an out-of-bounds heap write exploitable for control-flow hijacking and arbitrary kernel modification.\nA:H - Writing billions of 32-bit values past a 4-byte kmalloc object corrupts adjacent kernel heap metadata and objects, readily causing kernel oops/panic and complete loss of availability even before full exploitation."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:36:51.042Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/4e5f808b454167cc58d7084a407a554d8ddc694d"
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        {
          "url": "https://git.kernel.org/stable/c/de70a80992396ee306ee3a2810ad28aa1608ba9b"
        },
        {
          "url": "https://git.kernel.org/stable/c/5cf4a41aa0d74e4c83f82d2ce233b5189ed4b43c"
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        {
          "url": "https://git.kernel.org/stable/c/4f9eeedc3d3151f8a226fd676c314a813edda5a1"
        },
        {
          "url": "https://git.kernel.org/stable/c/93f5534b35a05ef8a0109c1eefa800062fee810a"
        }
      ],
      "title": "drm/amdkfd: fix a vulnerability of integer overflow in kfd debugger",
      "x_generator": {
        "engine": "bippy-1.2.0"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-63881",
    "datePublished": "2026-07-19T14:54:53.676Z",
    "dateReserved": "2026-07-19T07:54:57.018Z",
    "dateUpdated": "2026-08-05T12:36:51.042Z",
    "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.
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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-PG6J-5V22-GVQF

CVE-2026-63881 (GCVE-0-2026-63881)

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