s390/mm: Add missing secure storage access fixups for donated memory
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.
CVE-2026-31568
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-31568
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "084ea4d611a3d00ee3930400b262240e10895900",
"lessThan": "1eb35c54cd81cf874ce7d69e3dbfb162f211b8bd",
"versionType": "git"
},
{
"status": "affected",
"version": "084ea4d611a3d00ee3930400b262240e10895900",
"lessThan": "74ccc099f1baa9236b8fb600406457a0870c83a9",
"versionType": "git"
},
{
"status": "affected",
"version": "084ea4d611a3d00ee3930400b262240e10895900",
"lessThan": "b36b0e804aee5f20c6798dbeaeaa7cfdb7c6cf88",
"versionType": "git"
},
{
"status": "affected",
"version": "084ea4d611a3d00ee3930400b262240e10895900",
"lessThan": "43ac2d18db1131df0a89993f709131ebfc29f3bd",
"versionType": "git"
},
{
"status": "affected",
"version": "084ea4d611a3d00ee3930400b262240e10895900",
"lessThan": "b00be77302d7ec4ad0367bb236494fce7172b730",
"versionType": "git"
}
],
"programFiles": [
"arch/s390/mm/fault.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.7"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.7",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.114",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.21",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19.11",
"versionType": "semver",
"lessThanOrEqual": "6.19.*"
},
{
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"arch/s390/mm/fault.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-31568
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #46229 · Revision 1
- Added to Heist Feed
- Publisher date