CVE-2026-93079

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux5908f3ed6dc209e5c824e63afda7545805f75a7e < 3f02031a0a53de0d3ef066c92d0486b2b11be40caffected
LinuxLinux5908f3ed6dc209e5c824e63afda7545805f75a7e < 329ea475581c647a680a6937e353c1a6e2534b40affected
LinuxLinux5908f3ed6dc209e5c824e63afda7545805f75a7e < 4bf6bac375076ced2fa4b3fef8739bd985f93456affected
LinuxLinux6.15affected
LinuxLinux0 < 6.15unaffected
LinuxLinux6.18.52 <= 6.18.*unaffected
LinuxLinux7.2.6 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References