CVE-2026-31568 (GCVE-0-2026-31568)

Vulnerability from cvelistv5 – Published: 2026-04-24 14:35 – Updated: 2026-05-11 22:11
VLAI?
Title
s390/mm: Add missing secure storage access fixups for donated memory
Summary
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 084ea4d611a3d00ee3930400b262240e10895900 , < b36b0e804aee5f20c6798dbeaeaa7cfdb7c6cf88 (git)
Affected: 084ea4d611a3d00ee3930400b262240e10895900 , < 43ac2d18db1131df0a89993f709131ebfc29f3bd (git)
Affected: 084ea4d611a3d00ee3930400b262240e10895900 , < b00be77302d7ec4ad0367bb236494fce7172b730 (git)
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    Linux Linux Affected: 5.7
Unaffected: 0 , < 5.7 (semver)
Unaffected: 6.18.21 , ≤ 6.18.* (semver)
Unaffected: 6.19.11 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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{
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          "programFiles": [
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              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/mm: Add missing secure storage access fixups for donated memory\n\nThere are special cases where secure storage access exceptions happen\nin a kernel context for pages that don\u0027t have the PG_arch_1 bit\nset. That bit is set for non-exported guest secure storage (memory)\nbut is absent on storage donated to the Ultravisor since the kernel\nisn\u0027t allowed to export donated pages.\n\nPrior to this patch we would try to export the page by calling\narch_make_folio_accessible() which would instantly return since the\narch bit is absent signifying that the page was already exported and\nno further action is necessary. This leads to secure storage access\nexception loops which can never be resolved.\n\nWith this patch we unconditionally try to export and if that fails we\nfixup."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T22:11:18.354Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/43ac2d18db1131df0a89993f709131ebfc29f3bd"
        },
        {
          "url": "https://git.kernel.org/stable/c/b00be77302d7ec4ad0367bb236494fce7172b730"
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      "title": "s390/mm: Add missing secure storage access fixups for donated memory",
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    "cveId": "CVE-2026-31568",
    "datePublished": "2026-04-24T14:35:48.125Z",
    "dateReserved": "2026-03-09T15:48:24.117Z",
    "dateUpdated": "2026-05-11T22:11:18.354Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2"
}


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