CVE-2026-97496
HighCVSS 7.1Exploitation Probability (EPSS)
Low risk2th percentile - higher than 2% of all known CVEs
Summary
In the Linux kernel, the get_wave_state() function in the drm/amdkfd driver trusts cp_hqd_cntl_stack_size and cp_hqd_cntl_stack_offset values read directly from the MQD. On the CRIU-restore path (AMDKFD_IOC_RESTORE_PROCESS) these values are attacker-controlled, leading to an unbounded copy_to_user() that can leak adjacent GTT/kernel memory (up to ~4 GiB via integer underflow or 1 MiB against a 4 KiB allocation).
Risk Assessment
Potential leak of sensitive kernel memory, including KASLR pointers and other queues' MQDs and ring buffers, which may aid further exploitation. Requires local access and the ability to trigger the process restore operation.
Recommendation
Update the Linux kernel to a version containing the fix that clamps cp_hqd_cntl_stack_size to the actual allocated buffer size (q->ctl_stack_size) and cp_hqd_cntl_stack_offset to the clamped size before performing arithmetic and copy_to_user().
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: drm/amdkfd: Fix OOB memory exposure in get_wave_state() The get_wave_state() function for v9 trusts cp_hqd_cntl_stack_size and cp_hqd_cntl_stack_offset values read directly from the MQD, which are written by GPU microcode and fully attacker-controlled on the CRIU-restore path (via AMDKFD_IOC_RESTORE_PROCESS with H3). this leads to an unbounded copy_to_user() that can leak adjacent GTT/kernel memory. If offset > size, integer underflow produces a ~4 GiB read length, if size is set to 1 MiB against a 4 KiB allocation, we leak 1 MiB of adjacent kernel memory (other queues' MQDs, ring buffers, KASLR pointers). Fix by clamping both cp_hqd_cntl_stack_size to the actual allocated buffer size (q->ctl_stack_size) and cp_hqd_cntl_stack_offset to the clamped size before performing arithmetic and copy_to_user(). This ensures we never read beyond the allocated kernel BO regardless of attacker-supplied MQD field values.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS