{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2024-40989","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-07-12T12:17:45.605Z","datePublished":"2024-07-12T12:37:33.823Z","dateUpdated":"2026-08-05T11:34:27.078Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T11:34:27.078Z"},"descriptions":[{"lang":"en","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."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","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."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/arm64/kvm/vgic/vgic-init.c","arch/arm64/kvm/vgic/vgic-mmio-v3.c","arch/arm64/kvm/vgic/vgic.h"],"versions":[{"version":"e5a35635464bc5304674b84ea42615a3fd0bd949","lessThan":"68df4fc449fcc24347209e500ce26d5816705a77","status":"affected","versionType":"git"},{"version":"e5a35635464bc5304674b84ea42615a3fd0bd949","lessThan":"48bb62859d47c5c4197a8c01128d0fa4f46ee58c","status":"affected","versionType":"git"},{"version":"e5a35635464bc5304674b84ea42615a3fd0bd949","lessThan":"152b4123f21e6aff31cea01158176ad96a999c76","status":"affected","versionType":"git"},{"version":"e5a35635464bc5304674b84ea42615a3fd0bd949","lessThan":"0d92e4a7ffd5c42b9fa864692f82476c0bf8bcc8","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/arm64/kvm/vgic/vgic-init.c","arch/arm64/kvm/vgic/vgic-mmio-v3.c","arch/arm64/kvm/vgic/vgic.h"],"versions":[{"version":"5.13","status":"affected"},{"version":"0","lessThan":"5.13","status":"unaffected","versionType":"semver"},{"version":"6.1.96","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.36","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.9.7","lessThanOrEqual":"6.9.*","status":"unaffected","versionType":"semver"},{"version":"6.10","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.13","versionEndExcluding":"6.1.96"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.13","versionEndExcluding":"6.6.36"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.13","versionEndExcluding":"6.9.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.13","versionEndExcluding":"6.10"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/68df4fc449fcc24347209e500ce26d5816705a77"},{"url":"https://git.kernel.org/stable/c/48bb62859d47c5c4197a8c01128d0fa4f46ee58c"},{"url":"https://git.kernel.org/stable/c/152b4123f21e6aff31cea01158176ad96a999c76"},{"url":"https://git.kernel.org/stable/c/0d92e4a7ffd5c42b9fa864692f82476c0bf8bcc8"}],"title":"KVM: arm64: Disassociate vcpus from redistributor region on teardown","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CVE Program Container","references":[{"url":"https://git.kernel.org/stable/c/68df4fc449fcc24347209e500ce26d5816705a77","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/48bb62859d47c5c4197a8c01128d0fa4f46ee58c","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/152b4123f21e6aff31cea01158176ad96a999c76","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/0d92e4a7ffd5c42b9fa864692f82476c0bf8bcc8","tags":["x_transferred"]},{"url":"https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"}],"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2025-11-03T21:58:53.765Z"}},{"metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2024-40989","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2024-09-10T17:01:54.595799Z"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2024-09-11T17:34:20.480Z"}}]}}