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vuln-cve/data/2024/35xxx/CVE-2024-35847.json
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{
"dataType": "CVE_RECORD",
"cveMetadata": {
"cveId": "CVE-2024-35847",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2024-05-17T13:50:33.105Z",
"datePublished": "2024-05-17T14:47:26.175Z",
"dateUpdated": "2026-08-05T11:30:16.581Z"
},
"containers": {
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"shortName": "Linux",
"dateUpdated": "2026-08-05T11:30:16.581Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nirqchip/gic-v3-its: Prevent double free on error\n\nThe error handling path in its_vpe_irq_domain_alloc() causes a double free\nwhen its_vpe_init() fails after successfully allocating at least one\ninterrupt. This happens because its_vpe_irq_domain_free() frees the\ninterrupts along with the area bitmap and the vprop_page and\nits_vpe_irq_domain_alloc() subsequently frees the area bitmap and the\nvprop_page again.\n\nFix this by unconditionally invoking its_vpe_irq_domain_free() which\nhandles all cases correctly and by removing the bitmap/vprop_page freeing\nfrom its_vpe_irq_domain_alloc().\n\n[ tglx: Massaged change log ]"
}
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{
"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"
},
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{
"lang": "en",
"value": "AV:L - The only path into `its_vpe_irq_domain_alloc()` is the local `/dev/kvm` ioctl chain (`KVM_CREATE_VM`/`KVM_CREATE_VCPU`/`KVM_CREATE_DEVICE`/`KVM_DEV_ARM_ VGIC_CTRL_INIT` → `vgic_v4_init()` → `its_alloc_vcpu_irqs()`). No network, adjacent, or remote-peer input reaches this code.\nAC:L - The attacker deterministically creates the failure condition by exhausting the global 65536-entry `its_vpeid_ida` with its own VMs/vCPUs, then launching a multi-vCPU VM so vCPU 0 succeeds and vCPU 1 gets `-ENOSPC` — and it also chooses `nr_vcpus`, which selects the bitmap's kmalloc size class for grooming. Nothing depends on a race or on state outside the attacker's control; GICv4 hardware is the vulnerable configuration, not an attacker-uncontrolled precondition.\nPR:L - Only an unprivileged local account with an fd on `/dev/kvm` is needed — the `kvm` group on ordinary distros, world-accessible on many Android/ChromeOS/cloud images, and routinely passed into containers and untrusted-tenant VMM processes. There is no capability check on `vgic_init()`/`vgic_v4_init()`/`its_alloc_vcpu_irqs()`.\nUI:N - The attacker performs every step itself — draining the VPE ID space with its own VMs, then creating the VM whose vGIC init trips the error path. No victim action or other user's involvement is required.\nS:U - The defect and its consequences are confined to host kernel memory within a single security authority; no VM-escape, IOMMU, or sandbox boundary is crossed by the corruption itself.\nC:H - The `kmalloc()` inside the second `free_lpi_range()` reallocates the just-freed bitmap as a live `struct lpi_range`, which is then freed again, leaving a list-linked object on the slab freelist — a use-after-free the attacker can realloc and read back, giving uncontrolled disclosure of kernel memory. The duplicated `free_lpi_range()` additionally hands identical LPI IDs to two different devices/VMs, aliasing interrupt configuration and pending state across owners.\nI:H - The same dangling `lpi_range` can be re-allocated with attacker-controlled bytes, so `merge_lpi_ranges()`/`list_del()` operate on a forged `list_head` — a write-what-where primitive suitable for control-flow hijacking and privilege escalation. The order-4 `vprop_page` is also released twice, corrupting buddy-allocator state.\nA:H - Even unexploited, the double `kfree()`/`free_pages()` trips SLUB double-free detection, page refcount underflow, or later freelist corruption, producing an oops or panic. Any local user with `/dev/kvm` can trigger it at will and repeatedly."
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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