CVE-2026-93186

CVE-2026-93186 affects the Linux kernel CXL mailbox (cxl/mbox) subsystem. The CXL_MEM_SEND_COMMAND ioctl bounds the user-supplied in.size to the mailbox payload size but leaves out.size unbounded. The subsequent call to kvzalloc(out.size) in cxl_mbox_cmd_ctor() allows a user-controlled oversized ...

EUVD-2026-82294

In the Linux kernel, the following vulnerability has been resolved: cxl/mbox: Clamp mailbox output allocation to the payload size CXLMEMSENDCOMMAND bounds the user's in.size to the mailbox payload size but leaves out.size unbounded, then cxlmboxcmdctor calls kvzallocout.size. A large out.size...