# CVE-2024-26874: linux: In the Linux kernel, the following vulnerability has been resolved:  drm/mediatek: Fix a null pointer crash in mtk_dr...

CVE-2024-26874 is fixed in linux on 1 platform, first by DEBIAN-CVE-2024-26874, released April 17, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2024-26874
- Priority: Routine
- CVSS: 4.7 (medium)
- EPSS: 0.0024
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 17, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  drm/mediatek: Fix a null pointer crash in mtk_drm_crtc_finish_page_flip  It's possible that mtk_crtc->event is NULL in mtk_drm_crtc_finish_page_flip().  pending_needs_vblank value is set by mtk_crtc->event, but in mtk_drm_crtc_atomic_flush(), it's is not guarded by the same lock in mtk_drm_finish_page_flip(), thus a race condition happens.  Consider the following case:  CPU1                              CPU2 step 1: mtk_drm_crtc_atomic_begin() mtk_crtc->event is not null,                                   step 1:                                   mtk_drm_crtc_atomic_flush:                                   mtk_drm_crtc_update_config(                                       !!mtk_crtc->event) step 2: mtk_crtc_ddp_irq -> mtk_drm_finish_page_flip: lock mtk_crtc->event set to null, pending_needs_vblank set to false unlock                                   pending_needs_vblank set to true,                                    step 2:                                   mtk_crtc_ddp_irq ->                                   mtk_drm_finish_page_flip called again,                                   pending_needs_vblank is still true                                   //null pointer  Instead of guarding the entire mtk_drm_crtc_atomic_flush(), it's more efficient to just check if mtk_crtc->event is null before use.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.85-1 | [DEBIAN-CVE-2024-26874](https://patchblox.com/security/data/fix/linux/debian-cve-2024-26874.md) | Apr 17, 2024 |
| Linux | linux Debian 13.5 (trixie) | 6.7.12-1 | [DEBIAN-CVE-2024-26874](https://patchblox.com/security/data/fix/linux/debian-cve-2024-26874.md) | Apr 17, 2024 |
| Linux | linux Debian 14 | 6.7.12-1 | [DEBIAN-CVE-2024-26874](https://patchblox.com/security/data/fix/linux/debian-cve-2024-26874.md) | Apr 17, 2024 |

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