Bug 2554893 (CVE-2026-98475) - CVE-2026-98475 kernel: s390/cmf: Fix virtual vs physical address confusion
Summary: CVE-2026-98475 kernel: s390/cmf: Fix virtual vs physical address confusion
Keywords:
Status: NEW
Alias: CVE-2026-98475
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-10-18 15:26 UTC by OSIDB Bzimport
Modified: 2026-10-20 10:01 UTC (History)
17 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-10-18 15:26:07 UTC 
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.
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