KVM: SVM: Serialize accesses to the owner and mirror list with separate lock
In the Linux kernel, the following vulnerability has been resolved: KVM: SVM: Serialize accesses to the owner and mirror list with separate lock Interaction between KVM_CAP_VM_MOVE_ENC_CONTEXT_FROM and KVM_CAP_VM_COPY_ENC_CONTEXT_FROM can cause two separate issues: - in sev_migrate_from(), when the destination KVM is a mirror, the mirror entry is moved from the source's list to the owner's mirror_vms list, without holding the owner's lock unlike other writers of the owner's mirror list (sev_vm_copy_enc_context_from(), sev_vm_destroy()). A concurrent COPY or destroy can race with sev_migrate_from() and corrupt the list. - In sev_vm_destroy(), the *owner* is still active and could receive concurrently a KVM_CAP_VM_MOVE_ENC_CONTEXT_FROM that causes sev->enc_context_owner to change. In this case the incorrect VM receives kvm_put_kvm(). The second issue needs particular care because the owner could disappear altogether (even though the race window is impossibly small) between reading it and locking it. There is thus no way to perform the checks under the owner lock without putting struct kvm under SLAB_TYPESAFE_BY_RCU (which would allow kvm_get_kvm_safe() under RCU critical section). It is much simpler to just use a global lock, since the critical sections are so small and the new lock is always a leaf lock.
CVE-2026-74607
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-2026-74607
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": "b2125513dfc0dd0ec5a9605138a3c356592cfb73",
"lessThan": "7943ec3a6d0e7e0a2eb4943300bce089ac3e8c3e",
"versionType": "git"
},
{
"status": "affected",
"version": "b2125513dfc0dd0ec5a9605138a3c356592cfb73",
"lessThan": "28afde1edbd8b20058cbf4d75fb57876471ec334",
"versionType": "git"
},
{
"status": "affected",
"version": "b2125513dfc0dd0ec5a9605138a3c356592cfb73",
"lessThan": "328ab4fabe05af004d886659f8744076e320ddce",
"versionType": "git"
},
{
"status": "affected",
"version": "b2125513dfc0dd0ec5a9605138a3c356592cfb73",
"lessThan": "47976eaaf0a4eb46dade48b3246779090db9e3ec",
"versionType": "git"
},
{
"status": "affected",
"version": "b2125513dfc0dd0ec5a9605138a3c356592cfb73",
"lessThan": "d728baba0f20e49439fc7831bf3e4e7dee82161a",
"versionType": "git"
},
{
"status": "affected",
"version": "b2125513dfc0dd0ec5a9605138a3c356592cfb73",
"lessThan": "1d78d33275ef2a16c6d080910b291d0a97a0e613",
"versionType": "git"
}
],
"programFiles": [
"arch/x86/kvm/svm/sev.c",
"arch/x86/kvm/svm/svm.h"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.18"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.18",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.1.184",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.153",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.105",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.45",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.9",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"arch/x86/kvm/svm/sev.c",
"arch/x86/kvm/svm/svm.h"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-74607
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #33237 · Revision 1
- Added to Heist Feed
- Publisher date