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KVM: nVMX: Service local TLB flushes on failed nested VM-Enter

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: KVM: nVMX: Service local TLB flushes on failed nested VM-Enter KVM services local TLB flushes on "full" nested VM-Exits (through __nested_vmx_vmexit()), but not if a nested VM-Enter fails (e.g. due to failed VMCS checks in nested_vmx_enter_non_root_mode()). However, it is possible that KVM had queued TLB flushes that need to be performed, even if the nested VM-Enter was not successful. For example, if VPID is disabled for L2 (via nested_vmx_transition_tlb_flush(), or if via the MSR load lists, as the SDM says: If any MSR is being loaded in such a way that would architecturally require a TLB flush, the TLBs are updated so that, after VM entry, the logical processor will not use any translations that were cached before the transition. The SDM is unclear about when the TLB flush should occur, and whether or not a failed VM entry would flush the TLB, so it is safer to always do the TLB flush in this case. More concretely, KVM also updates the last VPID L1 used for L2 in nested_vmx_transition_tlb_flush() (i.e. last_vpid), even if the VM entry ultimately fails. With the current code, KVM could miss a TLB flush if L1 changes L2's VPID, then does a failed VM entry followed by a successful one, as the failed VM entry would update last_vpid but not actually flush the TLB. Servicing local TLB flushes on failed VM entries makes sure that the TLB is always flushed when last_vpid is updated.

Announced Group revision 1
Original source ↗

CVE-2026-89930

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-2026-89930

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": "5c614b3583e7b6dab0c86356fa36c2bcbb8322a0",
        "lessThan": "c0c66cd575e31218da6a7d104c6ef80b0830b60c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5c614b3583e7b6dab0c86356fa36c2bcbb8322a0",
        "lessThan": "1025b938dc439b75c720a568a855a13eeb245686",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5c614b3583e7b6dab0c86356fa36c2bcbb8322a0",
        "lessThan": "312cdb6d8940827dea63a7a52fb714a5049f06d1",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5c614b3583e7b6dab0c86356fa36c2bcbb8322a0",
        "lessThan": "f74fccdf4f7fb0780cd84944108d35f3d9dc46a7",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5c614b3583e7b6dab0c86356fa36c2bcbb8322a0",
        "lessThan": "c43563e7518e65ec6ccaa6a65f84c5af5ca5d379",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5c614b3583e7b6dab0c86356fa36c2bcbb8322a0",
        "lessThan": "62c3ee4c9f0e2efef5157358b3549e50ede96d73",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5c614b3583e7b6dab0c86356fa36c2bcbb8322a0",
        "lessThan": "05a0b701d1089fb57beeb8982f23c3bbafe0fa8b",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "arch/x86/kvm/vmx/nested.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.4"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.4",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.15.221",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.188",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.110",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.51",
        "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/x86/kvm/vmx/nested.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-89930

Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Event
#36373 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement

Revision history

  1. CVE-2026-89930 · Revision 1Source updated