CVE-2026-93823 (GCVE-0-2026-93823)

Vulnerability from cvelistv5 – Published: 2026-09-24 16:03 – Updated: 2026-09-24 16:03
VLAI
Title
drm/amdkfd: Let driver decide buffer size at AMDKFD_IOC_GET_DMABUF_INFO ioctl
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)
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < a65ccabde6deb95baf9442bd98299e2248884162 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 2d9fd0f01550aab4a0a1984b4379e50545906248 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 8242a8d9d7194d5ef8a8b38a5621ca0966a3ec15 (git)
Affected: 0 , < 6.12.111 (semver)
Affected: 0 , < 6.18.53 (semver)
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Linux Linux Unaffected: 6.12.111 , ≤ 6.12.* (semver)
Unaffected: 6.18.53 , ≤ 6.18.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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            "drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c",
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        {
          "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)"
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          "url": "https://git.kernel.org/stable/c/8242a8d9d7194d5ef8a8b38a5621ca0966a3ec15"
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      "title": "drm/amdkfd: Let driver decide buffer size at AMDKFD_IOC_GET_DMABUF_INFO ioctl",
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  "cveMetadata": {
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    "cveId": "CVE-2026-93823",
    "datePublished": "2026-09-24T16:03:01.639Z",
    "dateReserved": "2026-09-18T17:59:28.792Z",
    "dateUpdated": "2026-09-24T16:03:01.639Z",
    "state": "PUBLISHED"
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        "cveTags": [],
        "descriptions": [
          {
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            "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)"
          }
        ],
        "id": "CVE-2026-93823",
        "lastModified": "2026-09-24T17:17:15.947",
        "metrics": {},
        "published": "2026-09-24T17:17:15.947",
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    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-09-24T23:47:10Z",
      "cve": "CVE-2026-93823",
      "id": "CVE-2026-93823",
      "initial_release_date": "2026-09-24T23:47:10Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-93823",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-93823.json",
      "version": "2"
    }
  }
}



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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.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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