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CVE-2026-93186

kernel: cxl/mbox: Clamp mailbox output allocation to the payload size

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Severity

Low

Red Hat Product Security

5.5

CVSS 3.1

Review impact separately from score.

Published · September 17, 2026

Updated · October 14, 2026

Description

A flaw was found in the Linux kernel's Compute Express Link (CXL) mailbox driver. A local attacker could exploit an unbounded memory allocation vulnerability in the CXL_MEM_SEND_COMMAND function. By providing a large output size, an attacker could trigger a huge memory allocation, potentially leading to a system panic and a denial of service.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 5.5
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CWE-770 · Allocation of Resources Without Limits or Throttling