{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-97900",
  "modified": "2026-10-07T14:35:31Z",
  "upstream": [
    "CVE-2026-97900"
  ],
  "published": "2026-09-25T10:24:31Z",
  "summary": "drm/drm_exec: fix up contended obj when num_objects is 0",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/drm_exec: fix up contended obj when num_objects is 0\n\ndrm_exec_prepare_array() silently returns success without calling\ndrm_exec_lock_contended() when num_objects is zero. This breaks the\ninvariant upheld by drm_exec_lock_obj(), where every entry point into\nthe locking sequence must first attempt to lock any previously\ncontended object before proceeding.\n\nDrivers that chain multiple drm_exec_prepare_array() calls per\ndrm_exec_until_all_locked() iteration (e.g. amdgpu's userq signal/wait\nioctls, which prepare separate read and write BO arrays) can pass an\nempty array for one of the two calls. If contention is hit while\npreparing the non-empty array, exec->contended is set and the loop\nretries; on retry, the empty-array call preceding it is a no-op that\nnever clears exec->contended, so drm_exec_retry_on_contention()\nimmediately jumps back to the top of the loop without ever reaching\nthe call that would resolve the contention. This spins forever.\n\nFix it by having drm_exec_prepare_array() call drm_exec_lock_contended()\ndirectly when num_objects is zero, so a pending contended object dont\nloop infinitely.",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:13",
        "name": "linux"
      },
      "versions": [
        "1:6.18.29-1+rpt1",
        "1:6.18.33-1+rpt1",
        "1:6.18.34-1+rpt1",
        "1:6.18.39-1+rpt1",
        "1:6.18.50-1+rpt1"
      ],
      "ecosystem_specific": {
        "binaries": [
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            "binary_name": "linux-image-6.18.29+rpt-rpi-2712",
            "binary_version": "1:6.18.29-1+rpt1"
          },
          {
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            "binary_version": "1:6.18.29-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.18.29+rpt-rpi-v7",
            "binary_version": "1:6.18.29-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.18.29+rpt-rpi-v8",
            "binary_version": "1:6.18.29-1+rpt1"
          },
          {
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            "binary_version": "1:6.18.29-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.18.33+rpt-rpi-2712",
            "binary_version": "1:6.18.33-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.18.33+rpt-rpi-v6",
            "binary_version": "1:6.18.33-1+rpt1"
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          {
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            "binary_version": "1:6.18.33-1+rpt1"
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            "binary_version": "1:6.18.33-1+rpt1"
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            "binary_version": "1:6.18.34-1+rpt1"
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          {
            "binary_name": "linux-image-6.18.34+rpt-rpi-v8-rt",
            "binary_version": "1:6.18.34-1+rpt1"
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            "binary_version": "1:6.18.39-1+rpt1"
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            "binary_version": "1:6.18.39-1+rpt1"
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            "binary_version": "1:6.18.50-1+rpt1"
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      "database_specific": {
        "per_version": {
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            "linux_commit": "66318c5b5cd8145a662303af12ed39ac07eb27cc",
            "upstream_version": "6.18.29",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.53"
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          "1:6.18.33-1+rpt1": {
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-97900"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/506cfed91e50cc8055799480a2fde5a18f63a21c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/831cd124ce99c3e61266bed30519d52f7c26abed"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f3e74866018dab793ebee1fdf0ef34f7271d1f8c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a565022c02f218ec9789c2baf4690792e7a48cbb"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/159720704d9d652b64390c11fb971e15b0a78d23"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-10-03T11:04:09Z"
  }
}