CVE-2026-31568None▾ SunlitIn 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 page…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Oct 21.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.2%
0.2% → 0.2%
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.
Linux >= 084ea4d611a3d00ee3930400b262240e10895900 < 1eb35c54cd81cf874ce7d69e3dbfb162f211b8bdLinux >= 084ea4d611a3d00ee3930400b262240e10895900 < 74ccc099f1baa9236b8fb600406457a0870c83a9Linux >= 084ea4d611a3d00ee3930400b262240e10895900 < b36b0e804aee5f20c6798dbeaeaa7cfdb7c6cf88Linux >= 084ea4d611a3d00ee3930400b262240e10895900 < 43ac2d18db1131df0a89993f709131ebfc29f3bdLinux >= 084ea4d611a3d00ee3930400b262240e10895900 < b00be77302d7ec4ad0367bb236494fce7172b730Linux 5.7Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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