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CVE-2026-63885

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: drm/gem: fix race between change_handle and handle_delete drm_gem_change_handle_ioctl leaves the old handle live in the IDR during the window between spin_unlock(table_lock) and the final spin_lock(table_lock). A concurrent drm_gem_handle_delete on the old handle succeeds in this window, decrements handle_count to 0, and frees the GEM object while the new handle's IDR entry still references it. NULL the old handle's IDR entry before dropping table_lock so that any concurrent GEM_CLOSE on the old handle sees NULL and returns -EINVAL. Restore the old entry on the prime-bookkeeping error path.

Severity
HIGH
CVSS score
8.8 (v3.1)
Vulnerability status
Analyzed
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-07-19 16:17:05.623000
Last modified
2026-10-26 20:16:13.080000
View original CVE JSON 
{
  "id": "CVE-2026-63885",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-07-19T16:17:05.623",
  "lastModified": "2026-10-26T20:16:13.080",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/gem: fix race between change_handle and handle_delete\n\ndrm_gem_change_handle_ioctl leaves the old handle live in the IDR\nduring the window between spin_unlock(table_lock) and the final\nspin_lock(table_lock). A concurrent drm_gem_handle_delete on the old\nhandle succeeds in this window, decrements handle_count to 0, and frees\nthe GEM object while the new handle's IDR entry still references it.\n\nNULL the old handle's IDR entry before dropping table_lock so that any\nconcurrent GEM_CLOSE on the old handle sees NULL and returns -EINVAL.\nRestore the old entry on the prime-bookkeeping error path."
    }
  ],
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      "affectedData": [
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          "versions": [
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          "baseScore": 8.8,
          "baseSeverity": "HIGH",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "CHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
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        "exploitabilityScore": 2.0,
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