CVE-2026-46215 (GCVE-0-2026-46215)

Vulnerability from cvelistv5 – Published: 2026-05-28 09:40 – Updated: 2026-05-28 09:40
VLAI
Title
drm: Set old handle to NULL before prime swap in change_handle
Summary
In the Linux kernel, the following vulnerability has been resolved: drm: Set old handle to NULL before prime swap in change_handle There was a potential race condition in change_handle. The ioctl briefly had a single object with two idr entries; a concurrent gem_close could delete the object and remove one of the handles while leaving the other one dangling, which could subsequently be dereferenced for a use-after-free. To fix this, do the same dance that gem_close itself does. (f6cd7daecff5 drm: Release driver references to handle before making it available again) First idr_replace the old handle to NULL. Later, if the prime operations are successful, actually close it. create_tail required a similar dance to avoid a similar problem. (bd46cece51a3 drm/gem: Fix race in drm_gem_handle_create_tail()) It idr_allocs the new handle with NULL, then swaps in the correct object later to avoid races. We don't need to do that here, since the only operations that could race are drm_prime, and change_handle holds the prime lock for the entire duration. v2: cleanups of error paths
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 53096728b8910c6916ecc6c46a5abc5c678b58d9 , < 672464dd53231509c9c771110798c56d4660e19e (git)
Affected: 53096728b8910c6916ecc6c46a5abc5c678b58d9 , < 61bd96d3e5472c253f9c1ab77608f0c8aaa9d025 (git)
Affected: 53096728b8910c6916ecc6c46a5abc5c678b58d9 , < 5e28b7b94408897e41c63477aabc9e1db439bc8c (git)
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Linux Linux Affected: 6.18
Unaffected: 0 , < 6.18 (semver)
Unaffected: 6.18.32 , ≤ 6.18.* (semver)
Unaffected: 7.0.9 , ≤ 7.0.* (semver)
Unaffected: 7.1-rc3 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/drm_gem.c"
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      "descriptions": [
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm: Set old handle to NULL before prime swap in change_handle\n\nThere was a potential race condition in change_handle. The ioctl\nbriefly had a single object with two idr entries; a concurrent\ngem_close could delete the object and remove one of the handles\nwhile leaving the other one dangling, which could subsequently\nbe dereferenced for a use-after-free.\n\nTo fix this, do the same dance that gem_close itself does.\n(f6cd7daecff5 drm: Release driver references to handle before making it available again)\nFirst idr_replace the old handle to NULL. Later, if the prime\noperations are successful, actually close it.\n\ncreate_tail required a similar dance to avoid a similar problem.\n(bd46cece51a3 drm/gem: Fix race in drm_gem_handle_create_tail())\nIt idr_allocs the new handle with NULL, then swaps in the correct\nobject later to avoid races. We don\u0027t need to do that here, since\nthe only operations that could race are drm_prime, and\nchange_handle holds the prime lock for the entire duration.\n\nv2: cleanups of error paths"
        }
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      "providerMetadata": {
        "dateUpdated": "2026-05-28T09:40:32.050Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46215",
    "datePublished": "2026-05-28T09:40:32.050Z",
    "dateReserved": "2026-05-13T15:03:33.105Z",
    "dateUpdated": "2026-05-28T09:40:32.050Z",
    "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

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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.
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  • 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.