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CVE PROGRAM SOURCE RECORDUnscored

CVE-2026-31568

s390/mm: Add missing secure storage access fixups for donated memory

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Status
Published
Published
Updated
Assigning organization
Linux

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

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 084ea4d611a3d00ee3930400b262240e10895900 to < 48eda93e50f8361dee8e261fe55d0b31714e1e56affected
  • 084ea4d611a3d00ee3930400b262240e10895900 to < 1eb35c54cd81cf874ce7d69e3dbfb162f211b8bdaffected
  • 084ea4d611a3d00ee3930400b262240e10895900 to < b36b0e804aee5f20c6798dbeaeaa7cfdb7c6cf88affected
  • 084ea4d611a3d00ee3930400b262240e10895900 to < 43ac2d18db1131df0a89993f709131ebfc29f3bdaffected
  • 084ea4d611a3d00ee3930400b262240e10895900 to < b00be77302d7ec4ad0367bb236494fce7172b730affected

Linux Linux

Default version status: affected

  • 5.7affected
  • 0 to < 5.7unaffected
  • 6.1.191 to ≤ 6.1.*unaffected
  • 6.6.160 to ≤ 6.6.*unaffected
  • 6.18.21 to ≤ 6.18.*unaffected
  • 6.19.11 to ≤ 6.19.*unaffected
  • 7.0 to ≤ *unaffected

References