CVE-2026-89816

drm: Fix drm_crtc_commit leak if signaled when PAGE_FLIP_EVENT is used

State: Published
Severity: Not scored
Published: Sep 16, 2026
Updated: Oct 19, 2026
Reserved: Sep 11, 2026

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	24835e442f289813aa568d142a755672a740503c to before c5517b71101f61a45144e3cf77a19626355272deAffected 24835e442f289813aa568d142a755672a740503c to before 866a04137dac7e82a3848851061ff7ed15c2847eAffected 24835e442f289813aa568d142a755672a740503c to before 6a6a7aae4681a20cd32789fea9a487aaafa0e7a3Affected 24835e442f289813aa568d142a755672a740503c to before e2f27b5ed9084feb7bae9ef2bc80de37c92280b1Affected 24835e442f289813aa568d142a755672a740503c to before ff73f5f43d032c3da3c534c517f661e8dfeb358aAffected 24835e442f289813aa568d142a755672a740503c to before 66b1b309886337745d395bbc158440ab196305ceAffected 24835e442f289813aa568d142a755672a740503c to before e6195b941fdc8d81fc431c9f25539cf6c6234b51Affected 24835e442f289813aa568d142a755672a740503c to before 4d4be202165e832d74849b4a68e289a2a377039cAffected c75fe7899538890109aad7bbf92b2f304389e825Affected 2a3241044b1c4ecc13f73b7158881881fb7534a1Affected 4.9.19 to before 4.10Affected 4.10.7 to before 4.11Affected
LinuxLinux	4.11Affected before 4.11Not affected 5.10.270 through 5.10.Not affected 5.15.221 through 5.15.Not affected 6.1.188 through 6.1.Not affected 6.6.157 through 6.6.Not affected 6.12.110 through 6.12.Not affected 6.18.51 through 6.18.Not affected 7.2.5 through 7.2.*Not affected 7.3 and laterNot affected

Product

Versions

LinuxLinux

24835e442f289813aa568d142a755672a740503c to before c5517b71101f61a45144e3cf77a19626355272deAffected
24835e442f289813aa568d142a755672a740503c to before 866a04137dac7e82a3848851061ff7ed15c2847eAffected
24835e442f289813aa568d142a755672a740503c to before 6a6a7aae4681a20cd32789fea9a487aaafa0e7a3Affected
24835e442f289813aa568d142a755672a740503c to before e2f27b5ed9084feb7bae9ef2bc80de37c92280b1Affected
24835e442f289813aa568d142a755672a740503c to before ff73f5f43d032c3da3c534c517f661e8dfeb358aAffected
24835e442f289813aa568d142a755672a740503c to before 66b1b309886337745d395bbc158440ab196305ceAffected
24835e442f289813aa568d142a755672a740503c to before e6195b941fdc8d81fc431c9f25539cf6c6234b51Affected
24835e442f289813aa568d142a755672a740503c to before 4d4be202165e832d74849b4a68e289a2a377039cAffected
c75fe7899538890109aad7bbf92b2f304389e825Affected
2a3241044b1c4ecc13f73b7158881881fb7534a1Affected
4.9.19 to before 4.10Affected
4.10.7 to before 4.11Affected

LinuxLinux

4.11Affected
before 4.11Not affected
5.10.270 through 5.10.*Not affected
5.15.221 through 5.15.*Not affected
6.1.188 through 6.1.*Not affected
6.6.157 through 6.6.*Not affected
6.12.110 through 6.12.*Not affected
6.18.51 through 6.18.*Not affected
7.2.5 through 7.2.*Not affected
7.3 and laterNot affected

References

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