CVE-2026-93823 (GCVE-0-2026-93823)
Vulnerability from cvelistv5
Published
2026-09-24 16:03
Modified
2026-10-30 12:36
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/amdkfd: Let driver decide buffer size at AMDKFD_IOC_GET_DMABUF_INFO ioctl amdkfd driver needs allocate buffer to return bo metadata to user space. The buffer size is controlled by user currently. It is a potential security issue that hostile value (e.g. 2 GiB) lets any render-group user trigger order-MAX allocation/OOM in kernel context. This patch first finds bo metadata size. If the size is smaller than user provided value drive can safely allocate buffer in kernel space and copy to user space buffer. If not, driver will let user know, not allocate and copy. User will redo with new buffer in user space. This patch lets driver decide buffer allocation size to avoid potential hostile size from user space. (cherry picked from commit f54ce9e8cbd3abe0eda3a285f54dc4f572fe589a)
References
Impacted products
Vendor Product Version
Linux Linux Version: 1dde0ea95b782425b95455d487cb44991525a1d1
Version: 1dde0ea95b782425b95455d487cb44991525a1d1
Version: 1dde0ea95b782425b95455d487cb44991525a1d1
Version: 1dde0ea95b782425b95455d487cb44991525a1d1
Version: 1dde0ea95b782425b95455d487cb44991525a1d1
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{
  "containers": {
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        {
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          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c",
            "drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h",
            "drivers/gpu/drm/amd/amdkfd/kfd_chardev.c"
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            "drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h",
            "drivers/gpu/drm/amd/amdkfd/kfd_chardev.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "versionType": "semver"
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      "cpeApplicability": [
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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: Let driver decide buffer size at AMDKFD_IOC_GET_DMABUF_INFO ioctl\n\namdkfd driver needs allocate buffer to return bo metadata to user space. The\nbuffer size is controlled by user currently. It is a potential security issue\nthat hostile value (e.g. 2 GiB) lets any render-group user trigger order-MAX\nallocation/OOM in kernel context.\n\nThis patch first finds bo metadata size. If the size is smaller than user\nprovided value drive can safely allocate buffer in kernel space and copy to\nuser space buffer. If not, driver will let user know, not allocate and copy.\nUser will redo with new buffer in user space.\n\nThis patch lets driver decide buffer allocation size to avoid potential hostile\nsize from user space.\n\n(cherry picked from commit f54ce9e8cbd3abe0eda3a285f54dc4f572fe589a)"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T12:36:51.053Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/d298c100796b2cd1e7e75f8e615b79d034e510f8"
        },
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          "url": "https://git.kernel.org/stable/c/d51841bb5ceee75ec3aeeb4e5c51c8e5e7524228"
        },
        {
          "url": "https://git.kernel.org/stable/c/a65ccabde6deb95baf9442bd98299e2248884162"
        },
        {
          "url": "https://git.kernel.org/stable/c/2d9fd0f01550aab4a0a1984b4379e50545906248"
        },
        {
          "url": "https://git.kernel.org/stable/c/8242a8d9d7194d5ef8a8b38a5621ca0966a3ec15"
        }
      ],
      "title": "drm/amdkfd: Let driver decide buffer size at AMDKFD_IOC_GET_DMABUF_INFO ioctl",
      "x_generator": {
        "engine": "bippy-1.2.0"
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-93823",
    "datePublished": "2026-09-24T16:03:01.639Z",
    "dateReserved": "2026-09-18T17:59:28.792Z",
    "dateUpdated": "2026-10-30T12:36:51.053Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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