CVE-2026-93097
UnknownSummary
Vulnerability in the cxl/mbox subsystem in the Linux kernel involves an infinite loop in the poison list handling. A device returning count == 0 with CXL_POISON_FLAG_MORE set every iteration never advances nr_records, so the max_errors guard never trips and the do/while loop runs forever while holding poison.mutex. This hangs the sysfs-triggered scan thread and blocks all subsequent poison operations. The fix stops the loop on an empty payload.
Risk Assessment
A malfunctioning or malicious device can hang the system, blocking poison operations and causing denial of service.
Recommendation
Update the Linux kernel to a version with the fix that stops the loop on an empty payload, preventing the scan from hanging.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: cxl/mbox: Break poison list loop on an empty payload A device that returns count == 0 with CXL_POISON_FLAG_MORE set on every iteration never advances nr_records, so the max_errors guard never trips and the do/while loops forever while holding poison.mutex. That hangs the sysfs-triggered scan thread and blocks all subsequent poison operations on the device. The existing "Protect against an uncleared _FLAG_MORE" guard was intended to bound a misbehaving device but does not cover the count == 0 case. Stop the loop on an empty payload so a malfunctioning or malicious device cannot wedge the poison scan.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS