CVE-2024-26874
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…
Does this matter?
Lower severity and a low EPSS score (0.24%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 4.7 MEDIUMCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.24% probability · 15th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-476
- Affected
- linux/linux kernel · debian/debian linux
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/3fc88b246a2fc16014e374040fc15af1d3752535Mailing List, Patch
- https://git.kernel.org/stable/c/4688be96d20ffa49d2186523ee84f475f316fd49Mailing List, Patch
- https://git.kernel.org/stable/c/9acee29a38b4d4b70f1f583e5ef9a245db4db710Mailing List, Patch
- https://git.kernel.org/stable/c/9beec711a17245b853d64488fd5b739031612340Mailing List, Patch
- https://git.kernel.org/stable/c/a3dd12b64ae8373a41a216a0b621df224210860aMailing List, Patch
- https://git.kernel.org/stable/c/accdac6b71d5a2b84040c3d2234f53a60edc398eMailing List, Patch
- https://git.kernel.org/stable/c/c958e86e9cc1b48cac004a6e245154dfba8e163bMailing List, Patch
- https://git.kernel.org/stable/c/d2bd30c710475b2e29288827d2c91f9e6e2b91d7Mailing List, Patch
- https://git.kernel.org/stable/c/dfde84cc6c589f2a9f820f12426d97365670b731Mailing List, Patch
- https://git.kernel.org/stable/c/3fc88b246a2fc16014e374040fc15af1d3752535Mailing List, Patch
- https://git.kernel.org/stable/c/4688be96d20ffa49d2186523ee84f475f316fd49Mailing List, Patch
- https://git.kernel.org/stable/c/9acee29a38b4d4b70f1f583e5ef9a245db4db710Mailing List, Patch
- https://git.kernel.org/stable/c/9beec711a17245b853d64488fd5b739031612340Mailing List, Patch
- https://git.kernel.org/stable/c/a3dd12b64ae8373a41a216a0b621df224210860aMailing List, Patch
- https://git.kernel.org/stable/c/accdac6b71d5a2b84040c3d2234f53a60edc398eMailing List, Patch
- https://git.kernel.org/stable/c/c958e86e9cc1b48cac004a6e245154dfba8e163bMailing List, Patch
- https://git.kernel.org/stable/c/d2bd30c710475b2e29288827d2c91f9e6e2b91d7Mailing List, Patch
- https://git.kernel.org/stable/c/dfde84cc6c589f2a9f820f12426d97365670b731Mailing List, Patch
- https://lists.debian.org/debian-lts-announce/2024/06/msg00017.htmlMailing List
- https://lists.debian.org/debian-lts-announce/2024/06/msg00020.htmlMailing List
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.