KVM: s390: Zero initialize data structures for inject_pfault_token
In the Linux kernel, the following vulnerability has been resolved: KVM: s390: Zero initialize data structures for inject_pfault_token __kvm_inject_pfault_token() only sets .type and .u.ext.ext_params2 of the on-stack struct kvm_s390_irq but the full ext substructure is copied into the cpu local variable on inject. ext_params and pad contain stale stack values. Interrupt delivery only uses ext_params2, so nothing leaks to the guest, but a host user can use the migration ioctls to get to the data. Fix by zero-initializing the irq struct. Do the same for the inti data structure.
CVE-2026-89921
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-2026-89921
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": "383d0b050106abecb82f43101cac94fa423af5cd",
"lessThan": "ab1a8a3c9971200938093370da4c67d4427c25f2",
"versionType": "git"
},
{
"status": "affected",
"version": "383d0b050106abecb82f43101cac94fa423af5cd",
"lessThan": "b8abc760fa18a389319d977834a30550b3ec18e8",
"versionType": "git"
},
{
"status": "affected",
"version": "383d0b050106abecb82f43101cac94fa423af5cd",
"lessThan": "9b046de62b8098af6e2ba820b125ec9dc5f162c8",
"versionType": "git"
},
{
"status": "affected",
"version": "383d0b050106abecb82f43101cac94fa423af5cd",
"lessThan": "134f235e0e8de54611a72d3cc3f63e5f31246baa",
"versionType": "git"
},
{
"status": "affected",
"version": "383d0b050106abecb82f43101cac94fa423af5cd",
"lessThan": "4e2c7f7cbc27418f9a290399b986c1b85ff93b90",
"versionType": "git"
}
],
"programFiles": [
"arch/s390/kvm/kvm-s390.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3.19"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "3.19",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.112",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.52",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.5",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"arch/s390/kvm/kvm-s390.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-89921
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #48567 · Revision 1
- Added to Heist Feed
- Publisher date