{"api_version":"1","generated_at":"2026-10-27T04:28:09+00:00","cve":"CVE-2026-98469","urls":{"html":"https://cve.report/CVE-2026-98469","api":"https://cve.report/api/cve/CVE-2026-98469.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-98469","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-98469"},"summary":{"title":"KVM: arm64: Fix AArch32 DBGBXVR<n> handling","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: Fix AArch32 DBGBXVR<n> handling\n\nThe consolidation of the breakpoint and watchpoint register accessors\nswitched DBGBXVR<n> 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<n> uses Op2 1, an AArch32 guest access hits\nKVM_BUG_ON() and marks the VM dead.\n\nDBGBXVR<n> aliases DBGBVR<n>_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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-10-18 16:16:57","updated_at":"2026-10-24 14:16:43"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.1","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","baseScore":7.1,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.1","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","data":{"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"}}],"references":[{"url":"https://git.kernel.org/stable/c/8530a05b304d312fe7dfbc5df7d3e87cc31b256a","name":"https://git.kernel.org/stable/c/8530a05b304d312fe7dfbc5df7d3e87cc31b256a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/af6813d16ace2765011ca1c567be86ade1d1ee8e","name":"https://git.kernel.org/stable/c/af6813d16ace2765011ca1c567be86ade1d1ee8e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/6b1bca1b1ab77f60a62087337bfe6e2f0efb9e6d","name":"https://git.kernel.org/stable/c/6b1bca1b1ab77f60a62087337bfe6e2f0efb9e6d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98469","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98469","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3ce9f3357e9e099f02feaa002769eb99ef1138cd 8530a05b304d312fe7dfbc5df7d3e87cc31b256a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3ce9f3357e9e099f02feaa002769eb99ef1138cd af6813d16ace2765011ca1c567be86ade1d1ee8e git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3ce9f3357e9e099f02feaa002769eb99ef1138cd 6b1bca1b1ab77f60a62087337bfe6e2f0efb9e6d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.14","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.14 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.55 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.9 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"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<n> handling\n\nThe consolidation of the breakpoint and watchpoint register accessors\nswitched DBGBXVR<n> 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<n> uses Op2 1, an AArch32 guest access hits\nKVM_BUG_ON() and marks the VM dead.\n\nDBGBXVR<n> aliases DBGBVR<n>_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<n> 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<n> 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()'s default case. No race or uncontrollable state is involved.\nPR:N - DBGBXVR<n> 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<n> 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's 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<n> 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"},"nvd":{"publishedDate":"2026-10-18 16:16:57","lastModifiedDate":"2026-10-24 14:16:43","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","baseScore":7.1,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":2.5,"impactScore":4}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"98469","Ordinal":"1","Title":"KVM: arm64: Fix AArch32 DBGBXVR<n> handling","CVE":"CVE-2026-98469","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"98469","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: Fix AArch32 DBGBXVR<n> handling\n\nThe consolidation of the breakpoint and watchpoint register accessors\nswitched DBGBXVR<n> 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<n> uses Op2 1, an AArch32 guest access hits\nKVM_BUG_ON() and marks the VM dead.\n\nDBGBXVR<n> aliases DBGBVR<n>_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.","Type":"Description","Title":"KVM: arm64: Fix AArch32 DBGBXVR<n> handling"}]}}}