SB2026081524 - Use-after-free in Linux kernel drm rockchip driver

Description

This security bulletin contains information about 1 vulnerability.

1) Use-after-free (CVE-ID: CVE-2026-74421)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to use-after-free in the dw_dp_rockchip_bind() encoder structure allocation and cleanup logic when releasing resources during component unbind and later DRM device cleanup. A local user can trigger the affected cleanup path to cause a denial of service.

The issue occurs because the encoder-containing structure can be freed by the component framework before later access during DRM-managed cleanup.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/0d60b835bca42f0f790689dd47819ed881a92ccc
• https://git.kernel.org/stable/c/6b0b92d1110eccccbd5ba2949bd2b9fb6ea5fc12
• https://git.kernel.org/stable/c/ed9da8d23020352ad24c528db09b5acdd78b81fd