CVE-2026-98178 drm/amdgpu: Skip KFD mapping clear before initialization
A null pointer dereference in the AMD GPU kernel driver can cause a system crash during GPU reset on specific hardware configurations.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-98178?
CVE-2026-98178 is a vulnerability in Linux, published on 6 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
drm/amdgpu: Skip KFD mapping clear before initialization
amdgpu_amdkfd_clear_kfd_mapping() assumes that a non-NULL kfd_dev has a fully populated node array. This is not true when KFD device initialization fails after probe.
For example, kgd2kfd_device_init() sets num_nodes before checking PCIe atomics support. On Polaris systems without the required atomics, it returns before allocating nodes[0], but the kfd_dev remains attached to the amdgpu device. A later GPU reset then dereferences nodes[0]->id.
Require the authoritative KFD initialization flag before walking the node array, matching the existing KFD reset and teardown paths.
(cherry picked from commit 4ac1835823c47903fbb278bbf474773c46f59edc)
Which versions are affected by CVE-2026-98178?
How do I fix CVE-2026-98178?
Apply the vendor's patch.
Is CVE-2026-98178 being exploited?
There is no known exploitation of CVE-2026-98178 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-98178, GHSA-mcv2-4hx8-7c7c, UBUNTU-CVE-2026-98178.