CVE-2026-63885 (GCVE-0-2026-63885)

Vulnerability from cvelistv5 – Published: 2026-07-19 14:54 – Updated: 2026-07-20 13:41
VLAI
Title
drm/gem: fix race between change_handle and handle_delete
Summary
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
8.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 672464dd53231509c9c771110798c56d4660e19e , < 0dfa42cfe4dbe114533480503934f43e33c1e83d (git)
Affected: 61bd96d3e5472c253f9c1ab77608f0c8aaa9d025 , < cde2c9257cbe8463b9dcf7b1075177b72b5fd938 (git)
Affected: 5e28b7b94408897e41c63477aabc9e1db439bc8c , < 7164d78559b0ff29931a366a840a9e5dd53d4b7c (git)
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Linux Linux Affected: 6.18.32 , < 6.18.35 (semver)
Affected: 7.0.9 , < 7.0.12 (semver)
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          "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\u0027s IDR entry still references it.\n\nNULL the old handle\u0027s 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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    "datePublished": "2026-07-19T14:54:58.590Z",
    "dateReserved": "2026-07-19T07:54:57.018Z",
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    "state": "PUBLISHED"
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}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.