{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/arm64/kvm/sys_regs.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "8530a05b304d312fe7dfbc5df7d3e87cc31b256a",
              "status": "affected",
              "version": "3ce9f3357e9e099f02feaa002769eb99ef1138cd",
              "versionType": "git"
            },
            {
              "lessThan": "af6813d16ace2765011ca1c567be86ade1d1ee8e",
              "status": "affected",
              "version": "3ce9f3357e9e099f02feaa002769eb99ef1138cd",
              "versionType": "git"
            },
            {
              "lessThan": "6b1bca1b1ab77f60a62087337bfe6e2f0efb9e6d",
              "status": "affected",
              "version": "3ce9f3357e9e099f02feaa002769eb99ef1138cd",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/arm64/kvm/sys_regs.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.14"
            },
            {
              "lessThan": "6.14",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.55",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.9",
              "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": "6.18.55",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.9",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: Fix AArch32 DBGBXVR\u003cn\u003e handling\n\nThe consolidation of the breakpoint and watchpoint register accessors\nswitched DBGBXVR\u003cn\u003e from trap_bvr() to trap_dbg_wb_reg(). The latter\nselects backing storage with demux_wb_reg(), which only handles Op2 values\n4 through 7. Since DBGBXVR\u003cn\u003e uses Op2 1, an AArch32 guest access hits\nKVM_BUG_ON() and marks the VM dead.\n\nDBGBXVR\u003cn\u003e aliases DBGBVR\u003cn\u003e_EL1[63:32], and its AA32(HI) descriptor\nalready selects the upper half. Map Op2 1 to dbg_bvr[] alongside Op2 4,\nrestoring the pre-regression behavior."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The trigger is an AArch32 EL1 MRC/MCR to CP14 DBGBXVR\u003cn\u003e during KVM_RUN; handle_exit() dispatches CP14_MR through kvm_handle_cp14_32() and trap_dbg_wb_reg() to the patched demux_wb_reg(). No network or physical input reaches this path.\nAC:L - On a host advertising KVM_CAP_ARM_EL1_32BIT, the attacker makes DBGBXVR\u003cn\u003e the first debug-register access; kvm_arm_setup_mdcr_el2() sets TDA while debug_owner is FREE, so Op2 1 deterministically reaches demux_wb_reg()\u0027s default case. No race or uncontrollable state is involved.\nPR:N - DBGBXVR\u003cn\u003e is UNDEFINED at guest EL0 and must execute at guest EL1, but a tenant controlling its AArch32 guest kernel holds no privilege in the vulnerable host KVM authority. The trapped CP14_MR path performs no host credential or capability check.\nUI:N - The attacker directly executes the DBGBXVR\u003cn\u003e instruction, and the existing KVM_RUN loop processes the resulting CP14_MR exit automatically. No host operator or other victim must act.\nS:C - The defect executes in host KVM\u0027s demux_wb_reg(), while KVM_BUG_ON() invokes kvm_vm_bugged() and kvm_vm_dead() to disable the guest VM. Availability damage therefore crosses the host-hypervisor/guest security boundary.\nC:N - demux_wb_reg() calls KVM_BUG_ON() and returns NULL, after which trap_dbg_wb_reg() returns without calling dbg_to_reg(). No host or guest memory is exposed.\nI:N - Because demux_wb_reg() returns NULL before reg_to_dbg(), the access performs no attacker-controlled write or memory corruption. Only the deliberate vm_bugged/vm_dead error state and vCPU request are set.\nA:H - KVM_BUG_ON() leads through kvm_vm_bugged() to kvm_vm_dead(), which sets vm_dead and sends KVM_REQ_VM_DEAD to every vCPU. check_vcpu_requests() and subsequent vCPU ioctls return -EIO, making the entire VM permanently unrunnable."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-24T14:08:59.643Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/8530a05b304d312fe7dfbc5df7d3e87cc31b256a"
        },
        {
          "url": "https://git.kernel.org/stable/c/af6813d16ace2765011ca1c567be86ade1d1ee8e"
        },
        {
          "url": "https://git.kernel.org/stable/c/6b1bca1b1ab77f60a62087337bfe6e2f0efb9e6d"
        }
      ],
      "title": "KVM: arm64: Fix AArch32 DBGBXVR\u003cn\u003e handling",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98469",
    "datePublished": "2026-10-18T15:15:22.065Z",
    "dateReserved": "2026-09-25T10:25:14.351Z",
    "dateUpdated": "2026-10-24T14:08:59.643Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}