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

Vulnerability from cvelistv5 – Published: 2026-07-19 14:54 – Updated: 2026-08-05 12:36
VLAI
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
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: a70a93fa568b4f05aba548dadb673703eccf5480 , < 4e5f808b454167cc58d7084a407a554d8ddc694d (git)
Affected: a70a93fa568b4f05aba548dadb673703eccf5480 , < de70a80992396ee306ee3a2810ad28aa1608ba9b (git)
Affected: a70a93fa568b4f05aba548dadb673703eccf5480 , < 5cf4a41aa0d74e4c83f82d2ce233b5189ed4b43c (git)
Affected: a70a93fa568b4f05aba548dadb673703eccf5480 , < 4f9eeedc3d3151f8a226fd676c314a813edda5a1 (git)
Affected: a70a93fa568b4f05aba548dadb673703eccf5480 , < 93f5534b35a05ef8a0109c1eefa800062fee810a (git)
guessed Create a notification for this product.
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)
guessed Create a notification for this product.
Show details on NVD website
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{
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          "product": "Linux",
          "programFiles": [
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              "versionType": "semver"
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              "status": "unaffected",
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              "versionType": "semver"
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              "status": "unaffected",
              "version": "7.0.12",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
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      ],
      "cpeApplicability": [
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          "nodes": [
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                  "versionStartIncluding": "6.5",
                  "vulnerable": true
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                  "versionEndExcluding": "6.12.93",
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                },
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                  "versionStartIncluding": "6.5",
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                  "versionEndExcluding": "7.0.12",
                  "versionStartIncluding": "6.5",
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                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "6.5",
                  "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": [
        {
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            "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"
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          "url": "https://git.kernel.org/stable/c/de70a80992396ee306ee3a2810ad28aa1608ba9b"
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        },
        {
          "url": "https://git.kernel.org/stable/c/4f9eeedc3d3151f8a226fd676c314a813edda5a1"
        },
        {
          "url": "https://git.kernel.org/stable/c/93f5534b35a05ef8a0109c1eefa800062fee810a"
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      "title": "drm/amdkfd: fix a vulnerability of integer overflow in kfd debugger",
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    "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"
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    },
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      "cve": "CVE-2026-63881",
      "id": "msrc_CVE-2026-63881",
      "initial_release_date": "2026-07-21T01:03:35.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "drm/amdkfd: fix a vulnerability of integer overflow in kfd debugger",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-63881.json",
      "version": "1"
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          }
        ],
        "id": "CVE-2026-63881",
        "lastModified": "2026-07-27T17:44:23.777",
        "metrics": {
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                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
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      "cve": "CVE-2026-63881",
      "id": "CVE-2026-63881",
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      "source": "Red Hat CSAF VEX",
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      "title": "kernel: drm/amdkfd: fix a vulnerability of integer overflow in kfd debugger",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63881.json",
      "version": "3"
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      "current_release_date": "2026-09-18T00:47:07Z",
      "cve": "CVE-2026-63881",
      "id": "CVE-2026-63881",
      "initial_release_date": "2026-07-21T13:04:20Z",
      "product_status:first_fixed": "31",
      "product_status:known_affected": "424",
      "product_status:known_not_affected": "326",
      "product_status:recommended": "107",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-63881",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-63881.json",
      "version": "9"
    }
  }
}



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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.


Detection rules are retrieved from Rulezet.


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