CVE-2026-74607 (GCVE-0-2026-74607)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:31 – Updated: 2026-10-16 19:06
VLAI
Title
KVM: SVM: Serialize accesses to the owner and mirror list with separate lock
Summary
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.
Severity
8.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 19:02 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: b2125513dfc0dd0ec5a9605138a3c356592cfb73 , < 7943ec3a6d0e7e0a2eb4943300bce089ac3e8c3e (git)
Affected: b2125513dfc0dd0ec5a9605138a3c356592cfb73 , < 28afde1edbd8b20058cbf4d75fb57876471ec334 (git)
Affected: b2125513dfc0dd0ec5a9605138a3c356592cfb73 , < 328ab4fabe05af004d886659f8744076e320ddce (git)
Affected: b2125513dfc0dd0ec5a9605138a3c356592cfb73 , < 47976eaaf0a4eb46dade48b3246779090db9e3ec (git)
Affected: b2125513dfc0dd0ec5a9605138a3c356592cfb73 , < d728baba0f20e49439fc7831bf3e4e7dee82161a (git)
Affected: b2125513dfc0dd0ec5a9605138a3c356592cfb73 , < 1d78d33275ef2a16c6d080910b291d0a97a0e613 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.18
Unaffected: 0 , < 5.18 (semver)
Unaffected: 6.1.184 , ≤ 6.1.* (semver)
Unaffected: 6.6.153 , ≤ 6.6.* (semver)
Unaffected: 6.12.105 , ≤ 6.12.* (semver)
Unaffected: 6.18.45 , ≤ 6.18.* (semver)
Unaffected: 7.1.9 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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              "value": "AV:L - Reached only via local KVM_ENABLE_CAP ioctl on VM fds (KVM_CAP_VM_MOVE_ENC_CONTEXT_FROM/KVM_CAP_VM_COPY_ENC_CONTEXT_FROM) after opening /dev/kvm; not network, adjacent-wireless, or physical-device reachable.\nAC:L - Attacker with multiple VM fds can concurrently issue MOVE, COPY, and close operations from threads they control to deterministically race sev_migrate_from(), sev_vm_copy_enc_context_from(), and sev_vm_destroy().\nPR:L - Requires /dev/kvm and SEV setup (typically kvm-group or QEMU/container KVM passthrough), not init-namespace root; CAP_SYS_ADMIN-equivalent access is not obtainable via unprivileged user namespaces alone but kvm tenants hold sufficient access.\nUI:N - No victim interaction; the attacker VMM process issues the ioctl sequence and concurrent close/migrate operations directly.\nS:C - Races corrupt SEV mirror/owner linked lists and can misdirect kvm_put_kvm() on the wrong struct kvm, breaking AMD SEV encrypted-memory isolation boundaries and enabling host impact beyond the caller VM scope.\nC:H - Unsynchronized mirror_vms/enc_context_owner updates cause kernel linked-list corruption and kvm refcount UAF, which can disclose kernel memory and confidential SEV guest ciphertext via broken owner/mirror bookkeeping.\nI:H - List corruption and mistaken kvm_put_kvm() on the wrong KVM object provide exploitable heap corruption and control over SEV encryption context lifetime, enabling arbitrary host memory modification.\nA:H - Corrupted mirror lists, use-after-free on struct kvm, or premature destruction of an active SEV owner/mirror reliably triggers kernel oops/panic and denial of host service."
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        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: SVM: Serialize accesses to the owner and mirror list with separate lock\n\nInteraction between KVM_CAP_VM_MOVE_ENC_CONTEXT_FROM and\nKVM_CAP_VM_COPY_ENC_CONTEXT_FROM can cause two separate issues:\n\n- in sev_migrate_from(), when the destination KVM is a mirror, the mirror\n  entry is moved from the source\u0027s list to the owner\u0027s mirror_vms list,\n  without holding the owner\u0027s lock unlike other writers of the owner\u0027s\n  mirror list (sev_vm_copy_enc_context_from(), sev_vm_destroy()).\n  A concurrent COPY or destroy can race with sev_migrate_from() and\n  corrupt the list.\n\n- In sev_vm_destroy(), the *owner* is still active and could receive\n  concurrently a KVM_CAP_VM_MOVE_ENC_CONTEXT_FROM that causes\n  sev-\u003eenc_context_owner to change.  In this case the incorrect VM\n  receives kvm_put_kvm().\n\nThe second issue needs particular care because the owner could disappear\naltogether (even though the race window is impossibly small) between\nreading it and locking it.  There is thus no way to perform the checks\nunder the owner lock without putting struct kvm under SLAB_TYPESAFE_BY_RCU\n(which would allow kvm_get_kvm_safe() under RCU critical section).\n\nIt is much simpler to just use a global lock, since the critical\nsections are so small and the new lock is always a leaf lock."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nKVM: SVM: Serializar los accesos a la lista de propietario y espejo con un bloqueo separado\n\nLa interacci\u00f3n entre KVM_CAP_VM_MOVE_ENC_CONTEXT_FROM y KVM_CAP_VM_COPY_ENC_CONTEXT_FROM puede causar dos problemas separados:\n\n- en sev_migrate_from(), cuando el KVM de destino es un espejo, la entrada del espejo se mueve de la lista de la fuente a la lista mirror_vms del propietario, sin mantener el bloqueo del propietario a diferencia de otros escritores de la lista de espejos del propietario (sev_vm_copy_enc_context_from(), sev_vm_destroy()). Una operaci\u00f3n COPY o destroy concurrente puede competir con sev_migrate_from() y corromper la lista.\n\n- En sev_vm_destroy(), el propietario sigue activo y podr\u00eda recibir concurrentemente un KVM_CAP_VM_MOVE_ENC_CONTEXT_FROM que hace que sev -\u003e enc_context_owner cambie. En este caso la VM incorrecta recibe kvm_put_kvm().\n\nEl segundo problema requiere especial atenci\u00f3n porque el propietario podr\u00eda desaparecer por completo (aunque la ventana de competici\u00f3n es incre\u00edblemente peque\u00f1a) entre leerlo y bloquearlo. No hay, por lo tanto, manera de realizar las comprobaciones bajo el bloqueo del propietario sin poner la estructura kvm bajo SLAB_TYPESAFE_BY_RCU (lo que permitir\u00eda kvm_get_kvm_safe() bajo la secci\u00f3n cr\u00edtica de RCU).\n\nEs mucho m\u00e1s simple simplemente usar un bloqueo global, ya que las secciones cr\u00edticas son tan peque\u00f1as y el nuevo bloqueo es siempre un bloqueo hoja."
          }
        ],
        "id": "CVE-2026-74607",
        "lastModified": "2026-10-16T20:17:45.763",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 8.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "CHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
                "version": "3.1"
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              "exploitabilityScore": 2.0,
              "impactScore": 6.0,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
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                "options": [
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                  {
                    "technicalImpact": "total"
                  }
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                "role": "CISA Coordinator",
                "timestamp": "2026-10-16T19:02:09.291868Z",
                "version": "2.0.3"
              }
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        "published": "2026-08-22T16:16:33.183",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/1d78d33275ef2a16c6d080910b291d0a97a0e613"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/28afde1edbd8b20058cbf4d75fb57876471ec334"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/328ab4fabe05af004d886659f8744076e320ddce"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/47976eaaf0a4eb46dade48b3246779090db9e3ec"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/7943ec3a6d0e7e0a2eb4943300bce089ac3e8c3e"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/d728baba0f20e49439fc7831bf3e4e7dee82161a"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-17T21:25:42+00:00",
      "cve": "CVE-2026-74607",
      "id": "CVE-2026-74607",
      "initial_release_date": "2026-08-22T00:00:00+00:00",
      "product_status:known_affected": "233",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: KVM: SVM: Serialize accesses to the owner and mirror list with separate lock",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74607.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-10-17T16:28:50Z",
      "cve": "CVE-2026-74607",
      "id": "CVE-2026-74607",
      "initial_release_date": "2026-09-02T01:04:06Z",
      "product_status:known_affected": "89",
      "product_status:known_not_affected": "269",
      "product_status:recommended": "58",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-74607",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-74607.json",
      "version": "3"
    }
  }
}



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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.