CVE-2026-93078

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxeb5dfcb9e36d0e46089fec777d911313c1876fa3 < 1281dc84c81577b51e2b61c24617c9f44b2cdb99affected
LinuxLinuxeb5dfcb9e36d0e46089fec777d911313c1876fa3 < 16b7c99eff030c6ea11ca24efa4b9f989cc74093affected
LinuxLinuxeb5dfcb9e36d0e46089fec777d911313c1876fa3 < cde18d6c1d913a67ab0afd3d9475ece4be79da50affected
LinuxLinux6.15affected
LinuxLinux0 < 6.15unaffected
LinuxLinux6.18.52 <= 6.18.*unaffected
LinuxLinux7.2.6 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References