{
  "cveId": "CVE-2026-98715",
  "url": "https://patchblox.com/security/cve/CVE-2026-98715",
  "summary": "CVE-2026-98715 is fixed in 57 products on 1 platform, first by DEBIAN-CVE-2026-98715, released October 19, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "KVM: SVM: Preserve TLB control (i.e. pending TLB flush) on failed VMRUN",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  KVM: SVM: Preserve TLB control (i.e. pending TLB flush) on failed VMRUN  Don\u0027t reset the VMCB\u0027s TLB control back to \u0022do nothing\u0022 on a failed VMRUN, as empirical testing shows that the CPU performs the requested TLB flush if and only if VMRUN is successful, i.e. clearing TLB control on a failed VMRUN effectively drops a TLB flush.  Explicitly track the need to flush all ASIDs on a per-CPU basis, as the ASID reuse condition is tied to the pCPU, not to the vCPU.  As a bonus, this also obviates the need to avoid clobbering FLUSH_ALL_ASID with TLB_CONTROL_FLUSH_ASID, e.g. in svm_flush_tlb_asid().  Deliberately don\u0027t bother saving/restoring the \u0022old\u0022 tlb_ctl on failure, in quotes because it\u0027s not exactly the old tlb_ctl, it\u0027s the tlb_ctl from after pre_svm_run(), but before updating tlb_ctl for flush_all_asids.  If VMRUN fails and TLB_CONTROL_FLUSH_ALL_ASID is forced, then the next successful run of the VMCB *may* unnecessarily flush all ASIDs, which strictly speaking could result in noisy neighbor issues.  However, the fact that new_asid() is already guest-triggerable, because of KVM\u0027s flawed behavior of clearing the ASID on emulated INIT, means that a guest can already trigger a flush of all ASIDs at roughly the same rate.  And once KVM stops clobbering the ASID on emulated INIT, *or* assigns a static ASID to each vCPU, this flaw goes away.",
  "published": "2026-10-18T16:17:25Z",
  "severity": "Important",
  "cvss": 7.8,
  "epss": 0.00198,
  "epssPercentile": 0.09613,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-98715",
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      "fix": "ALAS2023-2026-3402",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3402",
      "released": "2026-11-10T03:55:23Z"
    },
    {
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      "release": "amzn 2023",
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      "fix": "ALAS2023-2026-3402",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3402",
      "released": "2026-11-10T03:55:23Z"
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      "fix": "ALAS2023-2026-3390",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3390",
      "released": "2026-11-10T03:56:13Z"
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      "fix": "ALAS2023-2026-3390",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3390",
      "released": "2026-11-10T03:56:13Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-11T07:45:43Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}