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CVE-2026-98475: s390/cmf: Fix virtual vs physical address confusion

• 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: 2026-10-18 · updated 2026-10-19

Description

In the Linux kernel, the following vulnerability has been resolved: s390/cmf: Fix virtual vs physical address confusion The measurement block address is an absolute address. Define the associated schib_config and schib fields as dma64_t to enable automatic detection of incorrect assignments. Also add the missing virt_to_dma64() translation. Without this fix, a wrong address will be used by firmware when storing extended format channel measurement data on kernels built with CONFIG_RANDOMIZE_IDENTITY_BASE=y.

Affected products

• Linux kernel: 6.9 — 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/748ec2f7f5df9b4fc742546a8bfc8aa5d847353e
• https://git.kernel.org/stable/c/7f78226eb743b362f52b212d7763801642539d1c
• https://git.kernel.org/stable/c/b11f369be31ea11c746833e4d3ad51dcd6b5fa2b
• https://git.kernel.org/stable/c/f4d04425e66af2ecee9d1a49ae0484436f3c2fd1

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