SB20260812309 - NULL pointer dereference in Linux kernel resource dce100 driver

Description

This security bulletin contains information about 1 vulnerability.

1) NULL pointer dereference (CVE-ID: CVE-2026-68235)

CWE-ID: CWE-476 - NULL Pointer Dereference

CVSSv4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/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 a null pointer dereference in dce100_find_first_free_match_stream_enc_for_link() and link_set_dpms_on() when handling DisplayPort MST stream encoder assignment. A local user can trigger DisplayPort MST multi-monitor handling to cause a denial of service.

The issue affects DCE8-class ASICs in a DisplayPort MST daisy-chain setup, such as when a second monitor is hot-plugged or already connected at boot.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/51ea665c30c424c98959101f3bf6f48ab42949c8
• https://git.kernel.org/stable/c/bfe28ce019c2d667d98071262da33d8bba122919
• https://git.kernel.org/stable/c/d340cba0df4cf327c7e89c7c1a4e79d4771d7dd5
• https://git.kernel.org/stable/c/ed2d86aef9fa4c43f82da0fca91a60f7326d7d03