Description
In the Linux kernel, the following vulnerability has been resolved: s390/mm: Add missing secure storage access fixups for donated memory There are special cases where secure storage access exceptions happen in a kernel context for pages that don't have the PG_arch_1 bit set. That bit is set for non-exported guest secure storage (memory) but is absent on storage donated to the Ultravisor since the kernel isn't allowed to export donated pages. Prior to this patch we would try to export the page by calling arch_make_folio_accessible() which would instantly return since the arch bit is absent signifying that the page was already exported and no further action is necessary. This leads to secure storage access exception loops which can never be resolved. With this patch we unconditionally try to export and if that fails we fixup.
Affected products
linux: linux kernel
References5
- git.kernel.org/stable/c/43ac2d18db1131df0a89993f709131ebfc29f3bd Patch
- git.kernel.org/stable/c/b00be77302d7ec4ad0367bb236494fce7172b730 Patch
- git.kernel.org/stable/c/b36b0e804aee5f20c6798dbeaeaa7cfdb7c6cf88 Patch
- git.kernel.org/stable/c/1eb35c54cd81cf874ce7d69e3dbfb162f211b8bd
- git.kernel.org/stable/c/48eda93e50f8361dee8e261fe55d0b31714e1e56
Metrics
- CVSS 3.1
-
7.1
HIGH
Score source: NVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H - EPSS — exploit probability
- 0% percentile: 5 · as of 13 November 2026
- CWE
- CWE-125
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