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CVE-2026-31568

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

Description (CNA)

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 (CNA)

Vendor / productVersions
Linux / Linuxaffected 084ea4d611a3d00ee3930400b262240e10895900 before 1eb35c54cd81cf874ce7d69e3dbfb162f211b8bd; affected 084ea4d611a3d00ee3930400b262240e10895900 before 74ccc099f1baa9236b8fb600406457a0870c83a9; affected 084ea4d611a3d00ee3930400b262240e10895900 before b36b0e804aee5f20c6798dbeaeaa7cfdb7c6cf88; affected 084ea4d611a3d00ee3930400b262240e10895900 before 43ac2d18db1131df0a89993f709131ebfc29f3bd; affected 084ea4d611a3d00ee3930400b262240e10895900 before b00be77302d7ec4ad0367bb236494fce7172b730
Linux / Linuxaffected 5.7; unaffected 0 before 5.7; unaffected 6.6.160 through 6.6.*; unaffected 6.12.114 through 6.12.*; unaffected 6.18.21 through 6.18.*; unaffected 6.19.11 through 6.19.*; unaffected 7.0 through *

CWE

No CWE identifiers supplied.

References