CVE-2026-89816 (GCVE-0-2026-89816)
Vulnerability from cvelistv5
Published
2026-09-16 10:30
Modified
2026-10-19 08:53
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: drm: Fix drm_crtc_commit leak if signaled when PAGE_FLIP_EVENT is used Commit 1c6ceeee6ebb ("drm/atomic: Fix memleak on ERESTARTSYS during non-blocking commits") fixed a very similar issue when the event was allocated by drm_atomic_helper_setup_commit() itself. However, if the event is allocated in prepare_signaling(), it will also be set to NULL in complete_signaling(), which prevents drm_crtc_commit from being put in __drm_atomic_helper_crtc_destroy_state(). Dropping the reference when the event is set to NULL at complete_signaling() fixes the leak. The leak can be reproduced by sending a signal to the thread using DRM_MODE_PAGE_FLIP_EVENT and using a sw_sync fence to cause the atomic ioctl to block at drm_atomic_helper_wait_for_fences(). It happened both with amdgpu and vkms.
References
Impacted products
Vendor Product Version
Linux Linux Version: 24835e442f289813aa568d142a755672a740503c
Version: 24835e442f289813aa568d142a755672a740503c
Version: 24835e442f289813aa568d142a755672a740503c
Version: 24835e442f289813aa568d142a755672a740503c
Version: 24835e442f289813aa568d142a755672a740503c
Version: 24835e442f289813aa568d142a755672a740503c
Version: 24835e442f289813aa568d142a755672a740503c
Version: 24835e442f289813aa568d142a755672a740503c
Version: c75fe7899538890109aad7bbf92b2f304389e825
Version: 2a3241044b1c4ecc13f73b7158881881fb7534a1
Version: 4.9.19   ≤
Version: 4.10.7   ≤
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm: Fix drm_crtc_commit leak if signaled when PAGE_FLIP_EVENT is used\n\nCommit 1c6ceeee6ebb (\"drm/atomic: Fix memleak on ERESTARTSYS during\nnon-blocking commits\") fixed a very similar issue when the event was\nallocated by drm_atomic_helper_setup_commit() itself.\n\nHowever, if the event is allocated in prepare_signaling(), it will also be\nset to NULL in complete_signaling(), which prevents drm_crtc_commit from\nbeing put in __drm_atomic_helper_crtc_destroy_state().\n\nDropping the reference when the event is set to NULL at\ncomplete_signaling() fixes the leak.\n\nThe leak can be reproduced by sending a signal to the thread using\nDRM_MODE_PAGE_FLIP_EVENT and using a sw_sync fence to cause the atomic\nioctl to block at drm_atomic_helper_wait_for_fences(). It happened both\nwith amdgpu and vkms."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:53:10.436Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/6a6a7aae4681a20cd32789fea9a487aaafa0e7a3"
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        {
          "url": "https://git.kernel.org/stable/c/e2f27b5ed9084feb7bae9ef2bc80de37c92280b1"
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          "url": "https://git.kernel.org/stable/c/ff73f5f43d032c3da3c534c517f661e8dfeb358a"
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          "url": "https://git.kernel.org/stable/c/66b1b309886337745d395bbc158440ab196305ce"
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        },
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          "url": "https://git.kernel.org/stable/c/4d4be202165e832d74849b4a68e289a2a377039c"
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    "cveId": "CVE-2026-89816",
    "datePublished": "2026-09-16T10:30:49.052Z",
    "dateReserved": "2026-09-11T19:38:34.768Z",
    "dateUpdated": "2026-10-19T08:53:10.436Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2"
}


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