SB20261029216 - Memory leak in Linux kernel amd amdgpu driver

Description

This security bulletin contains information about 1 vulnerability.

1) Memory leak (CVE-ID: CVE-2026-99106)

CWE-ID: CWE-401 - Missing release of memory after effective lifetime

CVSSv4: 6.8 [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]

The vulnerability allows a local user to exhaust kernel memory and potentially cause a denial of service.

The vulnerability exists due to missing deallocation of HMM ranges in the Linux kernel AMDGPU command submission error paths when command submission fails after amdgpu_cs_parser_bos() succeeds. A local user can submit repeated command streams containing an indirect buffer with an unmapped va_start on a ring that patches command streams in place, such as VCN, to leak HMM ranges, their hmm_pfns arrays, and retained buffer object references, potentially exhausting kernel memory.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/1b4da805a0ba354a549ce07459c871c17dd94fe0
• https://git.kernel.org/stable/c/2d9d24385201f476a2f754495b71bbac5ba6ea7b
• https://git.kernel.org/stable/c/6ac46ae5ac561d4fc7d4246ad83d71bed0d9af9a