{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-43206",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-43206"
  ],
  "published": "2026-05-06T11:29:17Z",
  "summary": "drm/amdkfd: Fix out-of-bounds write in kfd_event_page_set()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdkfd: Fix out-of-bounds write in kfd_event_page_set()\n\nThe kfd_event_page_set() function writes KFD_SIGNAL_EVENT_LIMIT * 8\nbytes via memset without checking the buffer size parameter. This allows\nunprivileged userspace to trigger an out-of bounds kernel memory write\nby passing a small buffer, leading to  potential privilege\nescalation.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.165",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-43206"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3e04bc310d80b46eaf481f1fefcbcb37a187412d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/de8d7a25cd2eb5875b1d8d4fbc7fe4b4138b781f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b4034442cb090e4a980bdcc1540948606cbc951b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4857c37c7ba9aa38b9a4c694e8bd8d0091c87940"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/75fb57efdd7863fffbc39db23e9cad7aafda26ed"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/bfcd6b53e1f4feb182952f4ff9a137c36ceaf20b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4e72f419e4ed44cb3b60506752d8688c20a60a9b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8a70a26c9f34baea6c3199a9862ddaff4554a96d"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The vulnerable path is reached through local `/dev/kfd` ioctls, specifically allocating a KFD GPU memory object and passing its handle as `event_page_offset` to `AMDKFD_IOC_CREATE_EVENT`. There is no network, adjacent, or physical packet/device-input path.\nAC:L - The attacker controls the supplied event-page handle and can allocate a buffer smaller than `KFD_SIGNAL_EVENT_LIMIT * 8`, making the fixed-size `memset` out-of-bounds deterministic. No race or external condition is required.\nPR:L - The path is available to unprivileged userspace with access to KFD/AMDGPU device nodes, and the relevant ioctls have no capability flag or `capable()` gate. This is low privilege, not real administrator privilege.\nUI:N - Once a local attacker can execute code and open the device, exploitation only requires issuing ioctls. No victim user action is needed.\nS:U - The corruption occurs inside the kernel driver and impacts the same kernel security authority. This is standard local kernel compromise/DoS, not a cross-scope escape such as guest-to-host or IOMMU boundary bypass.\nC:H - The bug is an out-of-bounds kernel write into memory adjacent to a kernel-mapped GPU buffer, and kernel memory corruption can reasonably be leveraged to disclose sensitive kernel memory. Following the higher-severity rule for memory corruption, confidentiality impact is High.\nI:H - The vulnerable `memset` writes attacker-triggered data beyond the allocated object, giving a kernel memory corruption primitive. Out-of-bounds writes are scored as High integrity impact because they can plausibly be developed into privilege escalation or control-flow/data corruption.\nA:H - The out-of-bounds kernel write can corrupt adjacent kernel memory and readily crash or destabilize the kernel even without full exploitation. Kernel oops, panic, or persistent GPU/kernel failure is a High availability impact."
    }
  }
}