{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-53277",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-53277"
  ],
  "published": "2026-06-25T08:41:40Z",
  "summary": "KVM: arm64: Take the SRCU lock for page table walks in fault injection and AT emulation",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: Take the SRCU lock for page table walks in fault injection and AT emulation\n\nwalk_s1() and kvm_walk_nested_s2() expect to be called while holding\nkvm->srcu to guard against memslot changes. While this is generally\nthe case, __kvm_at_s12() and __kvm_find_s1_desc_level() call into the\nrespective walkers without taking kvm->srcu.\n\nFix by acquiring kvm->srcu prior to the table walk in both instances.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-53277"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/97706097f9b851cfe55c3b00b083dfc2bcf542bc"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ec42b4ed1b072ea2d03f086061aa67bad6d8de39"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f2ca45b50d4216c9cc7ffabf50d9ad1932209251"
    }
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 8.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The vulnerable KVM arm64 page-table walks are reached through local KVM execution paths, including `KVM_RUN` handling of trapped AT instructions and guest abort injection, not through network input. An attacker needs local ability to create/control a KVM VM or vCPU context.\nAC:L - The race is attacker-controllable because one thread can drive the vCPU path into the AT/S1PTW page-table walk while another thread mutates memslots with `KVM_SET_USER_MEMORY_REGION`. Nested virtualization support and memslot updates are reasonable KVM deployment conditions, not fragile external prerequisites.\nPR:L - The attacker needs access to KVM device/file descriptors or equivalent VM control, but the relevant ioctls do not require host root or a special capability once `/dev/kvm` access is available. This is therefore low privilege rather than high privilege.\nUI:N - No separate victim action is required after the attacker controls the KVM VM/vCPU and the racing memslot operation. The trigger is programmatic through guest execution and KVM ioctls.\nS:C - The bug is in host KVM handling of guest-controlled translation state, and exploitation can affect the host kernel/hypervisor outside the guest security boundary. KVM guest/VMM-to-host impact is a changed-scope scenario.\nC:H - The missing SRCU lock permits stale or freed memslot data to be used during `kvm_read_guest()` and descriptor updates, creating a use-after-free style memory safety issue. Under the required conservative scoring, this can support high-impact information disclosure.\nI:H - The affected walks can also update guest page-table descriptors and dirty-log state through stale memslot-derived pointers, giving a plausible kernel memory corruption/write surface. Use-after-free style corruption is scored as high integrity impact.\nA:H - At minimum, dereferencing stale memslot structures or dirty bitmap pointers can crash or oops the host kernel. A host kernel crash is high availability impact."
    }
  }
}