CVE-2026-80705

A low impact denial-of-service flaw was found in the Linux kernel's drm/amd/display driver. The return value of dml21_add_phantom_plane() was not checked; when the phantom plane allocation fails, the driver later dereferences the missing plane, causing a kernel segfault that crashes the system. A local low-privileged user able to trigger the failed allocation can therefore cause a denial of service, with no impact on confidentiality or integrity (CVSS:3.1 5.5, AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H; the Low impact rating reflects that only availability of the local system is affected). The kernel and kernel-rt packages in Red Hat Enterprise Linux 9 (minor updates 9.6 and later) and Red Hat Enterprise Linux 10, and the RHIVOS (Red Hat In-Vehicle OS) streams, are affected. Red Hat Enterprise Linux 7 and 8 and the earlier RHEL 9 minor updates (9.2, 9.4) are not affected because the vulnerable code is not present in those kernels. For the affected streams the fix is deferred to a future update because exploitation requires local access and can only crash the system; the residual risk of deferral is limited to a local denial of service with no privilege escalation, information disclosure, or data tampering.