Answer in brief
CVE-2026-31568 records a Unknown severity vulnerability in s390/mm: Add missing secure storage access fixups for donated memory. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=084ea4d611a3d00ee3930400b262240e10895900 <1eb35c54cd81cf874ce7d69e3dbfb162f211b8bd || >=084ea4d611a3d00ee3930400b262240e10895900 <74ccc099f1baa9236b8fb600406457a0870c83a9 || >=084ea4d611a3d00ee3930400b262240e10895900 <b36b0e804aee5f20c6798dbeaeaa7cfdb7c6cf88 || >=084ea4d611a3d00ee3930400b262240e10895900 <43ac2d18db1131df0a89993f709131ebfc29f3bd || >=084ea4d611a3d00ee3930400b262240e10895900 <b00be77302d7ec4ad0367bb236494fce7172b730 | 1eb35c54cd81cf874ce7d69e3dbfb162f211b8bd, 74ccc099f1baa9236b8fb600406457a0870c83a9, b36b0e804aee5f20c6798dbeaeaa7cfdb7c6cf88, 43ac2d18db1131df0a89993f709131ebfc29f3bd, b00be77302d7ec4ad0367bb236494fce7172b730 |
| Linux/Linuxgeneric | 5.7 | Not reported |
Published upstream
Apr 24, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 21, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 21, 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.
Quoted source text, attributed separately from HOL analysis.