CVE-2026-98145
N/A
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 8ed8b02396172b137ca8c78c3cb999ddf4fb0bbf < ed74e8d603df457bfcf16ed4f8f1660a1525759e | affected |
| Linux | Linux | 8ed8b02396172b137ca8c78c3cb999ddf4fb0bbf < ef6d27af71e1dc43181ec797a6aaa77c27c36786 | affected |
| Linux | Linux | 7.1 | affected |
| Linux | Linux | 0 < 7.1 | unaffected |
| Linux | Linux | 7.2.7 <= 7.2.* | unaffected |
| Linux | Linux | 7.3-rc2 <= * | unaffected |
Weaknesses
References
- https://git.kernel.org/stable/c/ed74e8d603df457bfcf16ed4f8f1660a1525759e
- https://git.kernel.org/stable/c/ef6d27af71e1dc43181ec797a6aaa77c27c36786
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