SB2026092832 - Exposure of Resource to Wrong Sphere in Linux kernel drm virtio driver

Description

This security bulletin contains information about 1 vulnerability.

1) Exposure of Resource to Wrong Sphere (CVE-ID: CVE-2026-98156)

CWE-ID: CWE-668 - Exposure of resource to wrong sphere

CVSSv4: 7.3 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to compromise confidentiality, integrity, and availability of memory belonging to another domain.

The vulnerability exists due to improper DMA address handling in virtio_gpu_object_shmem_init() when providing resource backing for a virtio-gpu framebuffer. A local user can cause framebuffer backing pages to be described with guest-physical addresses to compromise confidentiality, integrity, and availability of memory belonging to another domain.

Only Xen PV domains are affected; PVH domains are identity-mapped.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/455184dbe9652d01470d3c5cf5edd09a7a673a99
• https://git.kernel.org/stable/c/6a736d2f9d0c6e6217fe7532bc4c50ceca71db78
• https://git.kernel.org/stable/c/93c557e947ef0040004b1ac6a1c1265d79a957e1