CVE-2026-93079

In the Linux kernel, the following vulnerability has been resolved: cxl/features: Reject Get Feature count larger than the output buffer cxlctl_get_feature() sizes its output buffer from the user's fwctl_rpc.out_len, but the device is told to write cxl_mbox_get_feat_in.count bytes into rpc_out->payload, which is a separate user-controlled value. Nothing bounds count against out_len, so a small out_len with a large count overflows the kvzalloc()'d buffer. A heap OOB write reachable from FWCTL_RPC. Reject requests where count exceeds the available payload room, before allocating.

• https://git.kernel.org/stable/c/329ea475581c647a680a6937e353c1a6e2534b40
• https://git.kernel.org/stable/c/3f02031a0a53de0d3ef066c92d0486b2b11be40c
• https://git.kernel.org/stable/c/4bf6bac375076ced2fa4b3fef8739bd985f93456