CVE-2026-97900 (GCVE-0-2026-97900)
Vulnerability from cvelistv5
Published
2026-09-25 10:22
Modified
2026-10-19 09:10
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/drm_exec: fix up contended obj when num_objects is 0 drm_exec_prepare_array() silently returns success without calling drm_exec_lock_contended() when num_objects is zero. This breaks the invariant upheld by drm_exec_lock_obj(), where every entry point into the locking sequence must first attempt to lock any previously contended object before proceeding. Drivers that chain multiple drm_exec_prepare_array() calls per drm_exec_until_all_locked() iteration (e.g. amdgpu's userq signal/wait ioctls, which prepare separate read and write BO arrays) can pass an empty array for one of the two calls. If contention is hit while preparing the non-empty array, exec->contended is set and the loop retries; on retry, the empty-array call preceding it is a no-op that never clears exec->contended, so drm_exec_retry_on_contention() immediately jumps back to the top of the loop without ever reaching the call that would resolve the contention. This spins forever. Fix it by having drm_exec_prepare_array() call drm_exec_lock_contended() directly when num_objects is zero, so a pending contended object dont loop infinitely.
References
Impacted products
Vendor Product Version
Linux Linux Version: 09593216bff15866f95c8ad406cb7fdcec1ee40a
Version: 09593216bff15866f95c8ad406cb7fdcec1ee40a
Version: 09593216bff15866f95c8ad406cb7fdcec1ee40a
Version: 09593216bff15866f95c8ad406cb7fdcec1ee40a
Version: 09593216bff15866f95c8ad406cb7fdcec1ee40a
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{
  "containers": {
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          "programFiles": [
            "drivers/gpu/drm/drm_exec.c"
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          "vendor": "Linux",
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              "version": "7.2.7",
              "versionType": "semver"
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              "version": "7.3",
              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "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\u0027s 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-\u003econtended is set and the loop\nretries; on retry, the empty-array call preceding it is a no-op that\nnever clears exec-\u003econtended, 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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:10:26.649Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
        {
          "url": "https://git.kernel.org/stable/c/506cfed91e50cc8055799480a2fde5a18f63a21c"
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        {
          "url": "https://git.kernel.org/stable/c/831cd124ce99c3e61266bed30519d52f7c26abed"
        },
        {
          "url": "https://git.kernel.org/stable/c/f3e74866018dab793ebee1fdf0ef34f7271d1f8c"
        },
        {
          "url": "https://git.kernel.org/stable/c/a565022c02f218ec9789c2baf4690792e7a48cbb"
        },
        {
          "url": "https://git.kernel.org/stable/c/159720704d9d652b64390c11fb971e15b0a78d23"
        }
      ],
      "title": "drm/drm_exec: fix up contended obj when num_objects is 0",
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-97900",
    "datePublished": "2026-09-25T10:22:28.057Z",
    "dateReserved": "2026-09-25T10:18:58.200Z",
    "dateUpdated": "2026-10-19T09:10:26.649Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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