SB2026062971 - Resource exhaustion in Linux kernel resource dcn32 driver

Description

This security bulletin contains information about 1 vulnerability.

1) Resource exhaustion (CVE-ID: CVE-2026-53285)

CWE-ID: CWE-400 - Resource exhaustion

CVSSv4: 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/E:U/U:Clear

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

The vulnerability exists due to improper resource management in dcn32_enable_phantom_plane() when allocating phantom plane state during bandwidth validation. A local user can trigger allocation of a large dc_plane_state object to cause a denial of service.

The issue can lead to a kernel crash when memory allocation reaches the vmalloc path in a preemption-restricted context.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/183182235f6d53bac62c6c39014738a54a68dfa6
• https://git.kernel.org/stable/c/30bb2ec6695d62f63db4aa6179c4626834ed0cd6