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.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade kernel-modules-extra-commonUpgrade python3-perf-debuginfoUpgrade bpftoolUpgrade kernel-tools-develUpgrade kernel-develUpgrade python3-perfUpgrade kernelUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-debuginfoUpgrade kernel-modules-extraUpgrade kernel-tools-debuginfoUpgrade kernel-debuginfo-common-aarch64Upgrade perfUpgrade bpftool-debuginfoUpgrade kernel-toolsUpgrade kernel-headersUpgrade kernel-livepatch-6.1.188-233.385Upgrade perf-debuginfo | Oct 13, 2026 | Sep 16, 2026 |
| Debian | — | Upgrade linuxUpgrade linux-6.12 | Sep 30, 2026 | Sep 16, 2026 |
| Redhat_linux | — | No solution exists | Sep 25, 2026 | Sep 16, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Sep 30, 2026 | Sep 16, 2026 |
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