CVE-2026-93097

Description

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.

References

• https://git.kernel.org/stable/c/42eab80981f4d2ac820e253e80ecf92f8cd91f69
• https://git.kernel.org/stable/c/6ad491cef1a812cf7b53aa769cd8869516c47362
• https://git.kernel.org/stable/c/86771c105293ca26bfcc320b4f60d32c137b54aa
• https://git.kernel.org/stable/c/8b301c4afbce4bc3f94528441d8d5ce1366504ad
• https://git.kernel.org/stable/c/e77594e0cea67ab1c2317a27aa77a744e26ad6a6