Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: cxl/features: Reject Set Features output buffer smaller than the header cxlctl_set_feature() sizes its output buffer from the user's fwctl_rpc.out_len but never checks it is large enough to hold even the fwctl_rpc_cxl_out header. With out_len == 0 , kvzalloc() returns ZERO_SIZE_PTR, which passes the !rpc_out check, the subsequent rpc_out->size = 0 then writes through the poison pointer. Reject requests whose output buffer can't hold the response header, before allocating. The Set Feature reply carries no payload, so the header is all that is required.
References
- https://git.kernel.org/stable/c/1281dc84c81577b51e2b61c24617c9f44b2cdb99
- https://git.kernel.org/stable/c/16b7c99eff030c6ea11ca24efa4b9f989cc74093
- https://git.kernel.org/stable/c/cde18d6c1d913a67ab0afd3d9475ece4be79da50
FAQ
What is CVE-2026-93078?
CVE-2026-93078 is a documented vulnerability. In the Linux kernel, the following vulnerability has been resolved: cxl/features: Reject Set Features output buffer smaller than the header cxlctl_set_feature() sizes its output buffer from the user...
How severe is CVE-2026-93078?
CVSS scoring is not yet available for CVE-2026-93078. Check NVD for updates.
Is there a patch for CVE-2026-93078?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.