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CVE-2026-93186

unscored Published
NVD · CVE.org

In the Linux kernel, the following vulnerability has been resolved: cxl/mbox: Clamp mailbox output allocation to the payload size CXL_MEM_SEND_COMMAND bounds the user's in.size to the mailbox payload size but leaves out.size unbounded, then cxl_mbox_cmd_ctor() calls kvzalloc(out.size). A large out.size drives a huge allocation, above INT_MAX it WARNs and taints, and with panic_on_warn=1 it panics. The transport __cxl_pci_mbox_send_cmd() already clamps the response copy to min(out.size, payload_size, device len), so the output buffer is never written beyond payload_size. Clamp the allocation to payload_size too, matching the RAW path.

Fix

Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.

Change history 5

  1. StatusReceived → PublishedNVD modified 2026-10-21 12:52
  2. References+1 references (now 5)NVD modified 2026-10-21 13:21
  3. StatusPublished → ReceivedNVD modified 2026-10-21 13:21
  4. StatusReceived → PublishedNVD modified 2026-10-19 09:06
  5. First seenunscoredNVD modified 2026-10-19 10:17

Affected (CPE criteria) 0

NVD has not attached CPE configurations yet.

References 5