{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/include/asm/cpufeatures.h",
            "arch/x86/include/asm/tlb.h",
            "arch/x86/kernel/cpu/amd.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "e3e6779f77ab6f0a1aa80e24868d2d89f31053fe",
              "status": "affected",
              "version": "82378c6c2f435dba66145609de16bf44a9de6303",
              "versionType": "git"
            },
            {
              "lessThan": "098d80b04d0fe02889c332d061db968f070b83a6",
              "status": "affected",
              "version": "82378c6c2f435dba66145609de16bf44a9de6303",
              "versionType": "git"
            },
            {
              "lessThan": "87db7795cbaaf636ae22ae031f4906db7bb77803",
              "status": "affected",
              "version": "82378c6c2f435dba66145609de16bf44a9de6303",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/include/asm/cpufeatures.h",
            "arch/x86/include/asm/tlb.h",
            "arch/x86/kernel/cpu/amd.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.15"
            },
            {
              "lessThan": "6.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.57",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.57",
                  "versionStartIncluding": "6.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.11",
                  "versionStartIncluding": "6.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "6.15",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/CPU/AMD: Fix AMD TLBI Erratum #1718\n\nThe processor may fail to invalidate a TLB entry while executing an\nINVLPGB/TLBSYNC instruction pair.\n\nDetect the erratum and apply a software workaround when a microcode fix\nis not present."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - SYSCALL_DEFINE2(munmap)\u2192__vm_munmap\u2192do_vmi_munmap\u2192do_vmi_align_munmap\u2192vms_complete_munmap_vmas\u2192vms_clear_ptes\u2192unmap_region, which runs unmap_vmas then tlb_finish_mmu\u2192tlb_flush_mmu\u2192tlb_flush\u2192flush_tlb_mm_range\u2192broadcast_tlb_flush\u2192patched __tlbsync; no wire protocol carries the trigger.\nAC:L - An attacker can keep one mm active on four CPUs and repeat munmap until consider_global_asid() assigns a broadcast ASID, prime the target TLB entry, and repeatedly exercise the faulty pair while grooming reuse. CONFIG_BROADCAST_TLB_FLUSH is default on AMD64, and all timing/setup is controlled by the attacker\u0027s threads.\nPR:L - SYSCALL_DEFINE2(munmap) reaches the path for ordinary anonymous mappings; do_vmi_munmap() only validates the range, and __vm_munmap() only locks current-\u003emm. No capability, authentication, device permission, or privileged namespace operation is required.\nUI:N - The attacker\u0027s own threads create and touch a mapping, call munmap(), and access the stale virtual address after reuse. No victim must mount media, open a file, or perform another action.\nS:U - The failed __tlbsync() leaves a stale host CPU translation and compromises pages managed by the same host kernel. This is ordinary local kernel compromise, not a guest-to-host escape or an IOMMU-boundary bypass.\nC:H - zap_present_folio_ptes() clears the PTE and queues its folio, but tlb_finish_mmu() trusts the faulty __tlbsync() before tlb_batch_pages_flush() recycles it through free_pages_and_swap_cache(). The cached user translation can then read the recycled page, including kernel or other-process data.\nI:H - The same stale writable translation bypasses the cleared page table after free_pages_and_swap_cache() recycles the folio. Grooming that page into kernel objects or page tables provides a kernel-memory write primitive capable of control-flow hijacking.\nA:H - Writes through the stale translation can corrupt a recycled page table or kernel object and cause an oops, panic, or hang. The earlier tlbi=ipi mitigation commit also identifies this INVLPGB/TLBSYNC defect as a cause of observed userspace crashes."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-31T12:42:48.094Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/e3e6779f77ab6f0a1aa80e24868d2d89f31053fe"
        },
        {
          "url": "https://git.kernel.org/stable/c/098d80b04d0fe02889c332d061db968f070b83a6"
        },
        {
          "url": "https://git.kernel.org/stable/c/87db7795cbaaf636ae22ae031f4906db7bb77803"
        }
      ],
      "title": "x86/CPU/AMD: Fix AMD TLBI Erratum #1718",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-99099",
    "datePublished": "2026-10-26T14:52:04.997Z",
    "dateReserved": "2026-09-25T10:25:14.391Z",
    "dateUpdated": "2026-10-31T12:42:48.094Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}