CVE-2026-89816
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.
How to fix
- Linux Linuxc5517b71101f61a45144e3cf77a19626355272de, 866a04137dac7e82a3848851061ff7ed15c2847e, 6a6a7aae4681a20cd32789fea9a487aaafa0e7a3, e2f27b5ed9084feb7bae9ef2bc80de37c92280b1, ff73f5f43d032c3da3c534c517f661e8dfeb358a, 66b1b309886337745d395bbc158440ab196305ce, e6195b941fdc8d81fc431c9f25539cf6c6234b51, 4d4be202165e832d74849b4a68e289a2a377039c, 4.10, 4.11 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 24835e442f289813aa568d142a755672a740503c ≤ v < c5517b71101f61a45144e3cf77a19626355272de, 24835e442f289813aa568d142a755672a740503c ≤ v < 866a04137dac7e82a3848851061ff7ed15c2847e, 24835e442f289813aa568d142a755672a740503c ≤ v < 6a6a7aae4681a20cd32789fea9a487aaafa0e7a3, 24835e442f289813aa568d142a755672a740503c ≤ v < e2f27b5ed9084feb7bae9ef2bc80de37c92280b1, 24835e442f289813aa568d142a755672a740503c ≤ v < ff73f5f43d032c3da3c534c517f661e8dfeb358a, 24835e442f289813aa568d142a755672a740503c ≤ v < 66b1b309886337745d395bbc158440ab196305ce, 24835e442f289813aa568d142a755672a740503c ≤ v < e6195b941fdc8d81fc431c9f25539cf6c6234b51, 24835e442f289813aa568d142a755672a740503c ≤ v < 4d4be202165e832d74849b4a68e289a2a377039c, c75fe7899538890109aad7bbf92b2f304389e825, 2a3241044b1c4ecc13f73b7158881881fb7534a1, 4.9.19 ≤ v < 4.10, 4.10.7 ≤ v < 4.11, 4.11 | c5517b71101f61a45144e3cf77a19626355272de, 866a04137dac7e82a3848851061ff7ed15c2847e, 6a6a7aae4681a20cd32789fea9a487aaafa0e7a3, e2f27b5ed9084feb7bae9ef2bc80de37c92280b1, ff73f5f43d032c3da3c534c517f661e8dfeb358a, 66b1b309886337745d395bbc158440ab196305ce, e6195b941fdc8d81fc431c9f25539cf6c6234b51, 4d4be202165e832d74849b4a68e289a2a377039c, 4.10, 4.11 |
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