s390/fpu Vulnerability in Linux Kernel Affecting IBM Products
CVE-2025-68751
What is CVE-2025-68751?
The Linux kernel's s390/fpu subsystem has identified a reliability issue related to inline assembly instructions that can lead to false-positive reports from the kernel memory sanitizer (KMSAN). Specifically, the 'vstl' instruction's behavior varies based on the runtime value of the 'index' argument, potentially leading to incorrect memory access reports. This vulnerability has been addressed by updating the memory sanitizer's write helper calls to reflect the accurate byte size written, effectively mitigating misleading KMSAN alerts. Users should ensure they have the latest patches applied to improve the stability and security of their systems.
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Affected Version(s)
Linux dcd3e1de9d17dc43dfed87a9fc814b9dec508043 < 946357a538bb47740635c25520924351d2d91544
Linux dcd3e1de9d17dc43dfed87a9fc814b9dec508043 < 13dcd6308cb8f67134ee5d5d762b2a66363c695b
Linux dcd3e1de9d17dc43dfed87a9fc814b9dec508043 < 14e4e4175b64dd9216b522f6ece8af6997d063b2