{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-72289",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-72289"
  ],
  "published": "2026-08-15T06:04:33Z",
  "summary": "KVM: arm64: vgic: Check the interrupt is still ours before migrating it",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: vgic: Check the interrupt is still ours before migrating it\n\nvgic_prune_ap_list() drops both ap_list_lock and irq_lock while migrating\nan interrupt to another vCPU. After reacquiring the locks it only checks\nthat the affinity is unchanged (target_vcpu == vgic_target_oracle(irq))\nbefore moving the interrupt, which assumes that an interrupt whose affinity\nis preserved is still queued on this vCPU's ap_list.\n\nThat assumption no longer holds if the interrupt is taken off the ap_list\nwhile the locks are dropped. vgic_flush_pending_lpis() removes the\ninterrupt from the list and sets irq->vcpu to NULL, but leaves\nenabled/pending/target_vcpu untouched. As the interrupt is still enabled\nand pending, vgic_target_oracle() returns the same target_vcpu, so the\naffinity check passes and list_del() is run a second time on an entry that\nhas already been removed.\n\nAlso check that the interrupt is still assigned to this vCPU\n(irq->vcpu == vcpu) before moving it.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-72289"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3893e1fcf6f306b327a8358dcd1cbd077989a240"
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    },
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      "url": "https://git.kernel.org/stable/c/654be81c4c637af12709d47c7efc3302cd336513"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e363c0bc0226dc5ea5046a88e9a6864b82c45399"
    },
    {
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      "url": "https://git.kernel.org/stable/c/79fdd2aa774e44847cd9bb7edc811e73e3dc7bfe"
    },
    {
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      "url": "https://git.kernel.org/stable/c/0658b09cba7fe866c6cd70cd2dcdfdcabe80328f"
    },
    {
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      "url": "https://git.kernel.org/stable/c/0074b82cdfcb5fd13710a0ac308ade68ac6f6fbe"
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:50:24Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 9.3,
      "cvss_v3_severity": "Critical",
      "scenario": "AV:L - The bug is reached only from KVM guest execution paths\u2014GICv3 redistributor GICR_CTLR LPI-disable MMIO traps into vgic_flush_pending_lpis() and vCPU exit/sync paths into vgic_prune_ap_list()\u2014not from any remote network, adjacent-radio, or physical-device interface on the host.\nAC:L - A malicious multi-vCPU guest controls both racing sides by pinning threads, changing LPI affinity via ITS so an interrupt must migrate off one vCPU's ap_list, and concurrently disabling LPIS on that redistributor; the attacker creates the window rather than depending on uncontrollable host timing or memory layout.\nPR:N - The highest-impact scenario is a malicious cloud VM tenant on arm64 KVM who needs no host privileges beyond code already running inside the assigned guest; exploitation uses guest-kernel GIC MMIO/ITS operations, not host root, CAP_SYS_ADMIN in the init namespace, or additional /dev/kvm access beyond having a VM.\nUI:N - Exploitation is fully attacker-driven from within the guest VM through deliberate LPI setup, affinity changes, and timed GICR_CTLR writes; no victim user or administrator action on the host is required beyond normal VM operation.\nS:C - Double list_del()/list_add_tail() on host-kernel ap_list linkages corrupts KVM VGIC state from guest-controlled interrupt operations, crossing the guest-to-host virtualization security boundary with VM-escape-class impact rather than confining damage to the attacker's VM.\nC:H - Corrupting detached ap_list pointers and inserting them into another vCPU's ap_list_head enables out-of-bounds kernel linked-list traversal and disclosure of adjacent kmalloc slab memory (struct vgic_irq and neighboring objects); per kernel guidance, this list corruption is leverageable for arbitrary host memory read primitives.\nI:H - The vulnerable path performs list_del() on an already removed entry and may follow with list_add_tail() onto another vCPU's ap_list, letting a guest steer kernel list pointers and overwrite adjacent vgic_irq/host heap metadata for control-flow or data corruption on the hypervisor.\nA:H - Re-running list_del() on an entry already removed by vgic_flush_pending_lpis() dereferences poisoned list pointers and corrupts live ap_list_heads, causing immediate host kernel BUG/oops/panic or persistent interrupt-delivery failure during subsequent VGIC processing."
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}