Buffer Handling Vulnerability in Linux Kernel Affecting s390

CVE-2026-80551

What is CVE-2026-80551?

A vulnerability has been identified in the Linux kernel related to the handling of the first IDAW in a list for s390 architecture. This issue can lead to inconsistent buffer calculations due to the first IDAW not adhering to the standard 2K/4K alignment restrictions. By ensuring that the address found in the first IDAW remains constant during reads, the kernel can maintain the integrity of the data being processed. Proper mitigation of this flaw is essential for secure operations in environments utilizing s390 systems.

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