CVE-2026-31568
s390/mm: Add missing secure storage access fixups for donated memory
Reported by linux · Published April 24, 2026
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.
EPSS 0.16% · 5.0th percentile
Fixed versions
Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.
| Package | Ecosystem | Fixed in |
|---|---|---|
| Linux | Linux | b36b0e804aee5f20c6798dbeaeaa7cfdb7c6cf88, b00be77302d7ec4ad0367bb236494fce7172b730, 43ac2d18db1131df0a89993f709131ebfc29f3bd |
Risk scores
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | 084ea4d611a3d00ee3930400b262240e10895900, 084ea4d611a3d00ee3930400b262240e10895900, 084ea4d611a3d00ee3930400b262240e10895900 |
| Linux | Linux | 5.7, 0, 6.1.191 |
| linux | linux_kernel | 5.7, 5.7, 5.7 |
| Linux | Linux | 084ea4d611a3d00ee3930400b262240e10895900, 084ea4d611a3d00ee3930400b262240e10895900, 084ea4d611a3d00ee3930400b262240e10895900 |
Timeline
- Apr 24, 2026 CVE Published
- Apr 24, 2026 Security Advisory (102 in total, the first dated here)
- May 18, 2026 EPSS Score (25 in total, the first dated here)
- Jul 18, 2026 Coalition ESS Score
- Aug 11, 2026 Distribution Patch (97 in total, the first dated here)
- Oct 30, 2026 CVE Updated
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