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CVE-2025-39694 is a flaw in the Linux kernel s390 SCLP subsystem. Tracing code invoked by the SCLP interrupt handler translated the physical SCCB address to a virtual address before determining whether the SCCB address was NULL. When the kernel identity mapping begins at a nonzero address, translation of physical address zero produces a nonzero virtual address, causing the subsequent NULL check to fail. The handler can then incorrectly access the first page of the identity mapping. The upstream fix handles the NULL SCCB case before physical-to-virtual address translation.
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A Linux kernel s390/SCLP flaw involving an incorrect SCCB-present check.
A Linux kernel s390/SCLP issue involving the SCCB present check.
A Linux kernel s390 SCLP interrupt-handler flaw in which an SCCB NULL/presence check occurred after physical-to-virtual translation, allowing a NULL physical address to become a nonzero virtual address on systems whose identity mapping does not start at zero. This can lead to incorrect accesses to the first page of the identity mapping.
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Cross-references every affected SKU, including bundled OEM variants.
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