CVE-2026-98145
UnknownSummary
In the Linux kernel, the accel/amdxdna driver allows a command chain with command_count zero to pass the payload length check, and the fill loop does not run. On firmware without AIE2_NPU_COMMAND the request is rejected, but on firmware with aie2_get_npu_chain_msg_op() it reaches drm_clflush_virt_range(cmd_buf, 0), reading the byte before the buffer and faulting on the vmap guard page.
Risk Assessment
Any process able to open the render node can trigger a kernel fault (denial of service) by submitting a command chain with no commands.
Recommendation
Update the Linux kernel to a version with the fix that rejects a command chain carrying zero commands before further processing.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: accel/amdxdna: reject a command chain that carries no commands A chain whose command_count is zero passes the payload length check, because struct_size(payload, data, 0) is just the header. The fill loop then does not run, so offset stays zero and the request is submitted with a zero-length buffer. On firmware without AIE2_NPU_COMMAND that ends at the opcode check, since op is still ERT_INVALID_CMD and aie2_get_chain_msg_op() answers MSG_OP_MAX_OPCODE. aie2_get_npu_chain_msg_op() answers MSG_OP_CHAIN_EXEC_NPU whatever it is given, so there the submission continues to drm_clflush_virt_range(cmd_buf, 0), which reads the byte before the buffer and faults on the vmap guard page. EXEC_CMD is reachable by any process that can open the render node. Reject the request instead.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS