255 lines
13 KiB
JSON
255 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-2024-40989",
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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": "2024-07-12T12:17:45.605Z",
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"datePublished": "2024-07-12T12:37:33.823Z",
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"dateUpdated": "2026-08-05T11:34:27.078Z"
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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": "2026-08-05T11:34:27.078Z"
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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: Disassociate vcpus from redistributor region on teardown\n\nWhen tearing down a redistributor region, make sure we don't have\nany dangling pointer to that region stored in a vcpu."
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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 - The entire attack is a sequence of ioctls on /dev/kvm and the resulting VM/vCPU/vgic-device file descriptors (KVM_CREATE_DEVICE, KVM_SET_DEVICE_ATTR, KVM_RUN, KVM_GET_DEVICE_ATTR); no network, adjacent-network, or physical path reaches arch/arm64/kvm/vgic.\nAC:L - No race and no unpredictable state is involved — the attacker deterministically forces the free (redist region with count < nr_vcpus followed by a failing first KVM_RUN, or MMIO-bus exhaustion via ~1000 ioeventfds to make kvm_io_bus_register_dev return -ENOSPC), then re-inits the vgic and reads GICR_TYPER at will, with unlimited time to groom and spray the reclaimed kmalloc-cg-64 slot.\nPR:L - Creating a VM, a KVM_DEV_TYPE_ARM_VGIC_V3 device and vCPUs requires no capability at all — only the ability to open /dev/kvm, which is world-accessible (0666 udev rule) or kvm-group on mainstream distros and is exposed to unprivileged app-domain virtualization on Android/AVF.\nUI:N - The attacker performs the region setup, the failing KVM_RUN, the re-init and the GICR_TYPER read entirely within its own process; no victim action, mount, or file open is required.\nS:U - The free is only reachable from the host VMM process, not from guest code, so the attacker and the corrupted host kernel heap are in the same security authority — this is standard local kernel privilege escalation, not a guest-to-host escape.\nC:H - vgic_mmio_vcpu_rdist_is_last() dereferences a stale pointer into a freed, reclaimed kmalloc-cg-64 object, reading base/count/free_index from whatever heap data now occupies that slot; per kernel scoring guidance a use-after-free read of reclaimed slab memory is treated as High, and the resulting GICR_TYPER_LAST bit forms a repeatable oracle over sprayed heap contents.\nI:H - The bug leaves a permanently dangling kernel heap pointer in vcpu->arch.vgic_cpu.rdreg that survives arbitrary reallocation of that slab object, which is the canonical memory-corruption primitive class; the stale dereference also feeds falsified redistributor topology into GICR_TYPER as seen by the guest and by the migration save/restore stream.\nA:H - Dereferencing freed slab memory produces a KASAN use-after-free splat (fatal under panic_on_warn) and can oops outright if the backing page has been returned to the allocator, and the attacker can re-trigger the GICR_TYPER read arbitrarily often."
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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/vgic/vgic-init.c",
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"arch/arm64/kvm/vgic/vgic-mmio-v3.c",
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"arch/arm64/kvm/vgic/vgic.h"
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],
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"versions": [
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{
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"version": "e5a35635464bc5304674b84ea42615a3fd0bd949",
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"lessThan": "68df4fc449fcc24347209e500ce26d5816705a77",
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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": "e5a35635464bc5304674b84ea42615a3fd0bd949",
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"lessThan": "48bb62859d47c5c4197a8c01128d0fa4f46ee58c",
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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": "e5a35635464bc5304674b84ea42615a3fd0bd949",
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"lessThan": "152b4123f21e6aff31cea01158176ad96a999c76",
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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": "e5a35635464bc5304674b84ea42615a3fd0bd949",
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"lessThan": "0d92e4a7ffd5c42b9fa864692f82476c0bf8bcc8",
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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/vgic/vgic-init.c",
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"arch/arm64/kvm/vgic/vgic-mmio-v3.c",
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"arch/arm64/kvm/vgic/vgic.h"
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],
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"versions": [
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{
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"version": "5.13",
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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": "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": "6.1.96",
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"lessThanOrEqual": "6.1.*",
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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": "6.6.36",
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"lessThanOrEqual": "6.6.*",
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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": "6.9.7",
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"lessThanOrEqual": "6.9.*",
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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": "6.10",
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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": "5.13",
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"versionEndExcluding": "6.1.96"
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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": "5.13",
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"versionEndExcluding": "6.6.36"
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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": "5.13",
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"versionEndExcluding": "6.9.7"
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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": "5.13",
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"versionEndExcluding": "6.10"
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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/68df4fc449fcc24347209e500ce26d5816705a77"
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},
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{
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"url": "https://git.kernel.org/stable/c/48bb62859d47c5c4197a8c01128d0fa4f46ee58c"
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},
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{
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"url": "https://git.kernel.org/stable/c/152b4123f21e6aff31cea01158176ad96a999c76"
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},
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{
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"url": "https://git.kernel.org/stable/c/0d92e4a7ffd5c42b9fa864692f82476c0bf8bcc8"
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}
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],
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"title": "KVM: arm64: Disassociate vcpus from redistributor region on teardown",
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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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"adp": [
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{
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"title": "CVE Program Container",
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/68df4fc449fcc24347209e500ce26d5816705a77",
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{
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{
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"url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
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}
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],
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"providerMetadata": {
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"orgId": "af854a3a-2127-422b-91ae-364da2661108",
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"shortName": "CVE",
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"dateUpdated": "2025-11-03T21:58:53.765Z"
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}
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},
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2024-40989",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"version": "2.0.3",
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"timestamp": "2024-09-10T17:01:54.595799Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2024-09-11T17:34:20.480Z"
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}
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}
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]
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}
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} |