Live › vulnerability › CVE-2026-99106
Go to dashboardWhen an AMD GPU command submission fails after user page lookup, the kernel does not free the HMM range structures it allocated. Each failed submission leaks memory and a buffer object reference.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-28 11:32 UTC. All times on this page are UTC.
Systems running a Linux kernel with the amdgpu DRM driver that handle GPU command submissions with userptr buffers, such as workstations and servers with AMD GPUs. Systems without AMD GPUs or without the amdgpu driver loaded are unlikely to be affected. The sources do not say which kernel versions are affected.
No product ranges from the sources yet.
uname -r and compare it to the fixed stable kernels listed in the NVD entrylsmod | grep amdgpuEach row is the first time that source carried this signal. The analyst’s rows are its own findings.
In the Linux kernel, the following vulnerability has been resolved:
drm/amdgpu: free the userptr ranges when a CS fails after parser_bos
amdgpu_cs_parser_bos() allocates an HMM range for every userptr entry of the BO list and looks up the user pages. Those ranges are only freed when amdgpu_cs_parser_bos() itself fails or when amdgpu_cs_submit() checks them under the notifier lock. If amdgpu_cs_patch_jobs(), amdgpu_cs_vm_handling(), amdgpu_cs_sync_rings() or the early part of amdgpu_cs_submit() fails, nothing frees them: neither amdgpu_cs_parser_fini() nor amdgpu_bo_list_free() touch e->range.
Each such CS then leaks the range, its hmm_pfns array (8 bytes per page of the userptr BO) and the BO reference the range holds. An IB on a ring that patches the CS in place (e.g. VCN) with an unmapped va_start fails in amdgpu_cs_patch_ibs() and takes this path.
Free the ranges on those error paths. Ranges amdgpu_cs_submit() already dropped are NULL, so freeing them again is a no-op.
(cherry picked from commit c52a9542ed7cfd527feb938bd0accada2ac8d267)
This page as .md · .json · in your agent: get_signal("CVE-2026-99106")
NVD data is provided by NIST and is public domain. Posts quoted belong to their authors.