What’s Vulnerable › Vulnerabilities

CVE-2026-93097: cxl/mbox: Break poison list loop on an empty payload

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-17 · updated 2026-10-19

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.

Affected products

• Linux kernel: 6.4 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

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

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