159 lines
8.7 KiB
JSON
159 lines
8.7 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-98469",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-09-25T10:25:14.351Z",
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"datePublished": "2026-10-18T15:15:22.065Z",
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"dateUpdated": "2026-10-24T14:08:59.643Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-10-24T14:08:59.643Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
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"baseScore": 7.1,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"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."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"arch/arm64/kvm/sys_regs.c"
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],
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"versions": [
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{
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"version": "3ce9f3357e9e099f02feaa002769eb99ef1138cd",
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"lessThan": "8530a05b304d312fe7dfbc5df7d3e87cc31b256a",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "3ce9f3357e9e099f02feaa002769eb99ef1138cd",
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"lessThan": "af6813d16ace2765011ca1c567be86ade1d1ee8e",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "3ce9f3357e9e099f02feaa002769eb99ef1138cd",
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"lessThan": "6b1bca1b1ab77f60a62087337bfe6e2f0efb9e6d",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"arch/arm64/kvm/sys_regs.c"
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],
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"versions": [
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{
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"version": "6.14",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.14",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.55",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2.9",
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"lessThanOrEqual": "7.2.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.3",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.14",
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"versionEndExcluding": "6.18.55"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.14",
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"versionEndExcluding": "7.2.9"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.14",
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"versionEndExcluding": "7.3"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/8530a05b304d312fe7dfbc5df7d3e87cc31b256a"
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},
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{
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"url": "https://git.kernel.org/stable/c/af6813d16ace2765011ca1c567be86ade1d1ee8e"
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},
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{
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"url": "https://git.kernel.org/stable/c/6b1bca1b1ab77f60a62087337bfe6e2f0efb9e6d"
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}
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],
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"title": "KVM: arm64: Fix AArch32 DBGBXVR<n> handling",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |