CVE-2026-98145 accel/amdxdna: reject a command chain that carries no commands
A local attacker can cause a kernel crash by submitting an empty command chain to the AMD XDNA driver, leading to a null pointer dereference.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-98145?
CVE-2026-98145 is a medium-severity vulnerability in Linux kernel, published on 25 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-125
Which versions are affected by CVE-2026-98145?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-98145?
Apply the vendor's patch.
Is CVE-2026-98145 being exploited?
There is no known exploitation of CVE-2026-98145 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2026-98145, GHSA-p75r-8f9c-xr6p, UBUNTU-CVE-2026-98145.