CVE-2026-89571
HighCVSS 7.1Exploitation Probability (EPSS)
Low risk5th percentile - higher than 5% of all known CVEs
Summary
In the Linux kernel, fwctl_cmd_rpc() copies cmd->in_len bytes into a buffer, but the CXL callback cxlctl_fw_rpc() ignores in_len and never checks the user-controlled op_size against it. With a small in_len and large op_size the first memcpy() reads past the buffer and the data is sent to the device; a large enough op_size can oops the kernel.
Risk Assessment
The vulnerability allows out-of-bounds reads of kernel memory and potential data disclosure or system crash by a local user with fwctl access.
Recommendation
Update the Linux kernel to a version where the single dispatch point rejects any request whose fixed header plus op_size does not fit in the copied-in buffer.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: cxl/features: bound fwctl command payload to the input buffer fwctl_cmd_rpc() copies cmd->in_len bytes into inbuf = kvzalloc(cmd->in_len) and passes inbuf and in_len to ->fw_rpc(). The CXL callback cxlctl_fw_rpc() ignores in_len and never checks the user-controlled op_size against it. cxlctl_set_feature() bounds op_size only from below (op_size <= sizeof(feat_in->hdr)) and then reads op_size - sizeof(hdr) bytes from feat_in->feat_data via cxl_set_feature(). With a small in_len and a large op_size the first memcpy() already reads past the kvzalloc(in_len) buffer; the out-of-bounds bytes are placed in the mailbox payload and sent to the device, and a large enough op_size can walk into unmapped memory and oops the kernel. The Get paths pin op_size to a fixed size but likewise read the input struct without checking in_len. Reject, at the single dispatch point, any request whose fixed header plus op_size does not fit in the copied-in buffer. The lower-bound test guards the subtraction and ensures op_size was copied in before it is read.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS