159 lines
9.0 KiB
JSON
159 lines
9.0 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-2026-23425",
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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": "2026-01-13T15:37:46.015Z",
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"datePublished": "2026-04-03T13:24:33.384Z",
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"dateUpdated": "2026-08-05T12:21:39.120Z"
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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": "2026-08-05T12:21:39.120Z"
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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 ID register initialization for non-protected pKVM guests\n\nIn protected mode, the hypervisor maintains a separate instance of\nthe `kvm` structure for each VM. For non-protected VMs, this structure is\ninitialized from the host's `kvm` state.\n\nCurrently, `pkvm_init_features_from_host()` copies the\n`KVM_ARCH_FLAG_ID_REGS_INITIALIZED` flag from the host without the\nunderlying `id_regs` data being initialized. This results in the\nhypervisor seeing the flag as set while the ID registers remain zeroed.\n\nConsequently, `kvm_has_feat()` checks at EL2 fail (return 0) for\nnon-protected VMs. This breaks logic that relies on feature detection,\nsuch as `ctxt_has_tcrx()` for TCR2_EL1 support. As a result, certain\nsystem registers (e.g., TCR2_EL1, PIR_EL1, POR_EL1) are not\nsaved/restored during the world switch, which could lead to state\ncorruption.\n\nFix this by explicitly copying the ID registers from the host `kvm` to\nthe hypervisor `kvm` for non-protected VMs during initialization, since\nwe trust the host with its non-protected guests' features. Also ensure\n`KVM_ARCH_FLAG_ID_REGS_INITIALIZED` is cleared initially in\n`pkvm_init_features_from_host` so that `vm_copy_id_regs` can properly\ninitialize them and set the flag once done."
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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:L/UI:N/S:C/C:H/I:H/A:H",
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"baseScore": 8.8,
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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 vulnerable pKVM path is reached by a local attacker able to create and run an arm64 KVM VM through /dev/kvm ioctls, not by network or adjacent traffic.\nAC:L - The trigger is deterministic on affected pKVM systems: create/run a non-protected VM and execute guest EL1 system-register operations; there is no attacker-uncontrolled race.\nPR:L - The attacker needs local permission to use /dev/kvm and run a VM, but the kernel path does not require real root or CAP_SYS_ADMIN once that device access exists.\nUI:N - No victim interaction is required after the attacker runs the malicious VM workload.\nS:C - The bug crosses the KVM guest/host security boundary because guest-controlled CPU system-register state can be left active when returning to the host.\nC:H - Skipped save/restore of TCR2/PIR/POR-class registers can expose stale host or other-context register state and can plausibly undermine host memory permission behavior, so the highest defensible confidentiality impact is high.\nI:H - A malicious guest can corrupt host EL1 translation and permission-overlay state across the world switch, plausibly enabling unauthorized host memory modification or control-flow compromise.\nA:H - Corrupting host MMU and permission-control registers can reliably crash or destabilize the host kernel, and the attacker can repeat the trigger via KVM_RUN."
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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/hyp/nvhe/pkvm.c"
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],
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"versions": [
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{
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"version": "41d6028e28bd474298ff10409c292ec46cf43a90",
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"lessThan": "bce3847f7c51b86332bf2e554c9e80ca3820f16c",
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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": "41d6028e28bd474298ff10409c292ec46cf43a90",
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"lessThan": "858620655c1fbff05997e162fc7d83a3293d5142",
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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": "41d6028e28bd474298ff10409c292ec46cf43a90",
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"lessThan": "7e7c2cf0024d89443a7af52e09e47b1fe634ab17",
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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/hyp/nvhe/pkvm.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": "6.18.17",
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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": "6.19.7",
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"lessThanOrEqual": "6.19.*",
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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": "7.0",
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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": "6.18.17"
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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": "6.19.7"
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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": "7.0"
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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/bce3847f7c51b86332bf2e554c9e80ca3820f16c"
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},
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{
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"url": "https://git.kernel.org/stable/c/858620655c1fbff05997e162fc7d83a3293d5142"
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},
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{
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"url": "https://git.kernel.org/stable/c/7e7c2cf0024d89443a7af52e09e47b1fe634ab17"
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}
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],
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"title": "KVM: arm64: Fix ID register initialization for non-protected pKVM guests",
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"x_generator": {
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