{
  "cveId": "CVE-2026-98468",
  "url": "https://patchblox.com/security/cve/CVE-2026-98468",
  "summary": "CVE-2026-98468 is fixed in 74 products on 1 platform, first by DEBIAN-CVE-2026-98468, released October 19, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "KVM: arm64: Fix spurious warning for benign stage 2 teardown race",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  KVM: arm64: Fix spurious warning for benign stage 2 teardown race  kvmtool was used to establish an L1 guest with 8 CPUs and 8 GiB of RAM, an L2 guest with 4 CPUs and 4 GiB of RAM and an L3 guest with 2 CPUs and 2 GiB of RAM, all of which was then exited.  Under memory pressure in the L0 host warnings were observed due to migration triggered by compaction:  WARNING: arch/arm64/kvm/mmu.c:336 at __unmap_stage2_range\u002B0x64/0x80, CPU#5: kcompactd0/66  Which was, in turn, triggered by an MMU notifier for the host invalidation:  mmu_notifier_invalidate_range_start()   -\u003E ... -\u003E kvm_mmu_notifier_invalidate_range_start()     -\u003E kvm_mmu_unmap_gfn_range()       -\u003E kvm_unmap_gfn_range()         -\u003E kvm_nested_s2_unmap()           -\u003E kvm_stage2_unmap_range()             -\u003E __unmap_stage2_range()                -\u003E stage2_apply_range()        \t       \u003C- -EINVAL, triggering a WARN_ON()  Racing with L0\u0027s teardown of stage 2 page tables:  exit_mm()   -\u003E mmput()     -\u003E __mmput()       -\u003E exit_mmap()         -\u003E mmu_notifier_release() \t  -\u003E ... -\u003E kvm_mmu_notifier_release()             -\u003E kvm_flush_shadow_all()               -\u003E kvm_arch_flush_shadow_all() \t        -\u003E kvm_free_stage2_pgd() \t\t  -\u003E [ acquire kvm-\u003Emmu_lock for write ] \t\t  -\u003E mmu-\u003Epgt = NULL [ among other tasks ] \t\t  -\u003E [ release kvm-\u003Emmu_lock for write ]  It turns out there is a benign race resulting in a spurious warning:  \tThread A - notify: migration   | Thread B - notify: release \t-------------------------------|--------------------------------- \t\u003C kvm-\u003Emmu_lock held \u003E         | \tstage2_apply_range()           | \t  get mmu-\u003Epgt, check !NULL    | \t  ...                          | kvm_arch_flush_shadow_all() \t  cond_resched_rwlock_write(); |   \u003C contend, sleep kvm-\u003Emmu_lock \u003E \t\u003C drop kvm-\u003Emmu_lock \u003E         |   \u003C acquire kvm-\u003Emmu_lock\u003E                                        |   ... \t\t\t\t       |   kvm_free_stage2_pgd()                                        |     mmu-\u003Epgt = NULL \t\t\t\t       |   \u003C invalidate MMU \u003E \t\t\t\t       |   ... \t\t\t\t       |   \u003C release kvm-\u003Emmu_lock \u003E \t[ scheduled ]\t\t       | \tstage2_apply_range()           | \t  \u003C loop to next \u003E             | \t  get, mmu-\u003Epgt, check !NULL   | \t  is NULL, return -EINVAL      |         __unmap_stage2_range()         | \t  WARN_ON(-EINVAL) \u003C--- entirely spurious - the race was handled                                  correctly.  Fix the spurious warning by updating stage2_apply_range() to no longer treat concurrent PGT teardown on lock release as an error - whether the walker is tearing down page tables or doing something else this is a legitimate reason to abort the operation without error.  This keeps the warning in place for all other circumstances.  In practice only __unmap_stage2_range() actually does anything with the error so this only impacts that.",
  "published": "2026-10-18T16:16:57Z",
  "severity": "IMPORTANT",
  "cvss": 5.5,
  "epss": 0.00206,
  "epssPercentile": 0.10636,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-98468",
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      "platform": "linux",
      "product": "python3-perf6.18",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.56-125.164.amzn2023",
      "fix": "ALAS2023-2026-3251",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3251",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "python3-perf6.18-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.56-125.164.amzn2023",
      "fix": "ALAS2023-2026-3251",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3251",
      "released": "2026-11-07T01:06:52Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T19:12:23Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}