275 lines
13 KiB
JSON
275 lines
13 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-2021-47296",
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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": "2024-05-21T13:27:52.130Z",
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"datePublished": "2024-05-21T14:35:19.341Z",
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"dateUpdated": "2026-08-05T08:47:08.193Z"
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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": "2026-08-05T08:47:08.193Z"
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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: PPC: Fix kvm_arch_vcpu_ioctl vcpu_load leak\n\nvcpu_put is not called if the user copy fails. This can result in preempt\nnotifier corruption and crashes, among other issues."
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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:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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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 - Triggered via local host ioctls on a KVM vCPU fd (/dev/kvm → KVM_CREATE_VM → KVM_CREATE_VCPU → KVM_ENABLE_CAP/KVM_DIRTY_TLB), not via network packets or unaided guest execution.\nAC:L - The attacker reliably forces the bug by passing an invalid userspace pointer so copy_from_user fails after vcpu_load; no race or attacker-independent condition is required.\nPR:L - The ioctl path has no capable() check; access needs only /dev/kvm permissions (kvm group or equivalent device access), which is unprivileged rather than init-namespace root.\nUI:N - The attacker triggers the leak directly with their own KVM ioctls; no separate victim action is required.\nS:U - This is host userspace (VMM) corrupting host kernel state via the KVM ioctl interface, not a guest-to-host escape across a VM security boundary.\nC:H - Leaked preempt_notifier remains linked after vcpu free (kvm_destroy_vcpus), yielding a use-after-free of the vcpu object whose sprayed contents can disclose kernel memory when sched_in/out runs.\nI:H - UAF of the embedded preempt_notifier (including the ops pointer) and double-register hlist corruption enable heap corruption and control-flow hijack when notifier callbacks fire.\nA:H - Double preempt_notifier_register creates a self-referential hlist that infinite-loops in the scheduler, and the UAF/corruption paths cause kernel oops, hang, or panic."
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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/powerpc/kvm/powerpc.c"
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],
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"versions": [
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{
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"version": "b3cebfe8c1cadf1817939dcc3688a2504a69c662",
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"lessThan": "9bafc34dc4ad0cef18727c557f21ed3c3304df50",
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"status": "affected",
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"defaultStatus": "affected",
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"arch/powerpc/kvm/powerpc.c"
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],
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"versions": [
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{
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"version": "4.18",
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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": "4.18",
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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": "4.19.199",
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"lessThanOrEqual": "4.19.*",
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"status": "unaffected",
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},
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{
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"version": "5.4.136",
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"lessThanOrEqual": "5.4.*",
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"status": "unaffected",
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},
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{
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"version": "5.10.54",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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},
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{
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"version": "5.13.6",
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"lessThanOrEqual": "5.13.*",
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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": "5.14",
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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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],
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"title": "KVM: PPC: Fix kvm_arch_vcpu_ioctl vcpu_load leak",
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"version": "2.0.3",
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"timestamp": "2024-05-28T19:22:38.048038Z"
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