CVE-2026-89816
drm: Fix drm_crtc_commit leak if signaled when PAGE_FLIP_EVENT is used
Description
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.
INFO
Published Date :
Sept. 16, 2026, 11:16 a.m.
Last Modified :
Sept. 16, 2026, 11:16 a.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
- Apply the kernel commit that fixes the drm_crtc_commit leak.
- Update the Linux kernel to the patched version.
- Ensure proper reference counting for events in DRM.
- Test the fix for DRM event allocation and signaling.
References to Advisories, Solutions, and Tools
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CVE-2026-89816.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-89816 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
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stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-89816
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
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CVE-2026-89816 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-89816 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Sep. 16, 2026
Action Type Old Value New Value Added Description 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. Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/89xxx/CVE-2026-89816.json">CVE-2026-89816</a> Added Reference https://git.kernel.org/stable/c/4d4be202165e832d74849b4a68e289a2a377039c Added Reference https://git.kernel.org/stable/c/66b1b309886337745d395bbc158440ab196305ce Added Reference https://git.kernel.org/stable/c/6a6a7aae4681a20cd32789fea9a487aaafa0e7a3 Added Reference https://git.kernel.org/stable/c/866a04137dac7e82a3848851061ff7ed15c2847e Added Reference https://git.kernel.org/stable/c/c5517b71101f61a45144e3cf77a19626355272de Added Reference https://git.kernel.org/stable/c/e2f27b5ed9084feb7bae9ef2bc80de37c92280b1 Added Reference https://git.kernel.org/stable/c/e6195b941fdc8d81fc431c9f25539cf6c6234b51 Added Reference https://git.kernel.org/stable/c/ff73f5f43d032c3da3c534c517f661e8dfeb358a