CVE-2024-26874

MEDIUM
Published Apr 17, 2024 Modified Mar 4, 2025 CWE-476

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.

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CVSS v3.1 Score

4.7
MEDIUM
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-476 CWE-476

Affected Products

Vendor Product
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
debian debian_linux

References

Advisories & Patches

https://git.kernel.org/stable/c/3fc88b246a2fc16014e374040fc15af1d3752535 https://git.kernel.org/stable/c/4688be96d20ffa49d2186523ee84f475f316fd49 https://git.kernel.org/stable/c/9acee29a38b4d4b70f1f583e5ef9a245db4db710 https://git.kernel.org/stable/c/9beec711a17245b853d64488fd5b739031612340 https://git.kernel.org/stable/c/a3dd12b64ae8373a41a216a0b621df224210860a https://git.kernel.org/stable/c/accdac6b71d5a2b84040c3d2234f53a60edc398e https://git.kernel.org/stable/c/c958e86e9cc1b48cac004a6e245154dfba8e163b https://git.kernel.org/stable/c/d2bd30c710475b2e29288827d2c91f9e6e2b91d7 https://git.kernel.org/stable/c/dfde84cc6c589f2a9f820f12426d97365670b731 https://git.kernel.org/stable/c/3fc88b246a2fc16014e374040fc15af1d3752535 https://git.kernel.org/stable/c/4688be96d20ffa49d2186523ee84f475f316fd49 https://git.kernel.org/stable/c/9acee29a38b4d4b70f1f583e5ef9a245db4db710 https://git.kernel.org/stable/c/9beec711a17245b853d64488fd5b739031612340 https://git.kernel.org/stable/c/a3dd12b64ae8373a41a216a0b621df224210860a https://git.kernel.org/stable/c/accdac6b71d5a2b84040c3d2234f53a60edc398e https://git.kernel.org/stable/c/c958e86e9cc1b48cac004a6e245154dfba8e163b https://git.kernel.org/stable/c/d2bd30c710475b2e29288827d2c91f9e6e2b91d7 https://git.kernel.org/stable/c/dfde84cc6c589f2a9f820f12426d97365670b731

Frequently Asked Questions

What is 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 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. It has a CVSS v3.1 base score of 4.7 (MEDIUM).
How severe is CVE-2024-26874? +
CVE-2024-26874 has a CVSS v3.1 score of 4.7 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.
What products are affected by CVE-2024-26874? +
CVE-2024-26874 affects products from debian, linux, specifically: debian_linux, linux_kernel. Check the affected products table above for specific version ranges.
How do I check if I'm vulnerable to CVE-2024-26874? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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