CVE-2026-98145

/// Technical description

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.

/// Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// Affected products

/// References