{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-46314",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-46314"
  ],
  "published": "2026-06-08T15:50:00Z",
  "summary": "drm/v3d: Reject empty multisync extension to prevent infinite loop",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/v3d: Reject empty multisync extension to prevent infinite loop\n\nv3d_get_extensions() walks a userspace-provided singly-linked list of\nioctl extensions without any bound on the chain length. A local user\ncan craft a self-referential extension (ext->next == &ext) with zero\nin_sync_count and out_sync_count, which bypasses the existing duplicate-\nextension guard:\n\n    if (se->in_sync_count || se->out_sync_count)\n            return -EINVAL;\n\nThe guard never fires because v3d_get_multisync_post_deps() returns\nimmediately when count is zero, leaving both fields at zero on every\niteration. The result is an infinite loop in kernel context, blocking\nthe calling thread and pegging a CPU core indefinitely.\n\nFix this by rejecting a multisync extension where both in_sync_count\nand out_sync_count are zero in v3d_get_multisync_submit_deps(). An\nempty multisync carries no synchronization information and serves no\nuseful purpose, so returning -EINVAL for such an extension is the\ncorrect defense against this attack vector.",
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-46314"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/309abbddeca0c12714721928a819ef45e5710998"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4fa42a249e8cd6ed17aea04e5695b6e9001f2433"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9c5164781cb388d219d8f49fa0f0b04cf86ad544"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/fb44d589bf3148e13452185a6e772a7efbf2d684"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-06-19T12:00:59Z"
  }
}