CVE-2025-21779 (GCVE-0-2025-21779)

Vulnerability from cvelistv5 – Published: 2025-02-27 02:18 – Updated: 2025-11-03 20:59
VLAI?
Title
KVM: x86: Reject Hyper-V's SEND_IPI hypercalls if local APIC isn't in-kernel
Summary
In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Reject Hyper-V's SEND_IPI hypercalls if local APIC isn't in-kernel Advertise support for Hyper-V's SEND_IPI and SEND_IPI_EX hypercalls if and only if the local API is emulated/virtualized by KVM, and explicitly reject said hypercalls if the local APIC is emulated in userspace, i.e. don't rely on userspace to opt-in to KVM_CAP_HYPERV_ENFORCE_CPUID. Rejecting SEND_IPI and SEND_IPI_EX fixes a NULL-pointer dereference if Hyper-V enlightenments are exposed to the guest without an in-kernel local APIC: dump_stack+0xbe/0xfd __kasan_report.cold+0x34/0x84 kasan_report+0x3a/0x50 __apic_accept_irq+0x3a/0x5c0 kvm_hv_send_ipi.isra.0+0x34e/0x820 kvm_hv_hypercall+0x8d9/0x9d0 kvm_emulate_hypercall+0x506/0x7e0 __vmx_handle_exit+0x283/0xb60 vmx_handle_exit+0x1d/0xd0 vcpu_enter_guest+0x16b0/0x24c0 vcpu_run+0xc0/0x550 kvm_arch_vcpu_ioctl_run+0x170/0x6d0 kvm_vcpu_ioctl+0x413/0xb20 __se_sys_ioctl+0x111/0x160 do_syscal1_64+0x30/0x40 entry_SYSCALL_64_after_hwframe+0x67/0xd1 Note, checking the sending vCPU is sufficient, as the per-VM irqchip_mode can't be modified after vCPUs are created, i.e. if one vCPU has an in-kernel local APIC, then all vCPUs have an in-kernel local APIC.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 214ff83d4473a7757fa18a64dc7efe3b0e158486 , < 61224533f2b61e252b03e214195d27d64b22989a (git)
Affected: 214ff83d4473a7757fa18a64dc7efe3b0e158486 , < 45fa526b0f5a34492ed0536c3cdf88b78380e4de (git)
Affected: 214ff83d4473a7757fa18a64dc7efe3b0e158486 , < 5393cf22312418262679eaadb130d608c75fe690 (git)
Affected: 214ff83d4473a7757fa18a64dc7efe3b0e158486 , < 874ff13c73c45ecb38cb82191e8c1d523f0dc81b (git)
Affected: 214ff83d4473a7757fa18a64dc7efe3b0e158486 , < aca8be4403fb90db7adaf63830e27ebe787a76e8 (git)
Affected: 214ff83d4473a7757fa18a64dc7efe3b0e158486 , < ca29f58ca374c40a0e69c5306fc5c940a0069074 (git)
Affected: 214ff83d4473a7757fa18a64dc7efe3b0e158486 , < a8de7f100bb5989d9c3627d3a223ee1c863f3b69 (git)
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    Linux Linux Affected: 4.20
Unaffected: 0 , < 4.20 (semver)
Unaffected: 5.10.236 , ≤ 5.10.* (semver)
Unaffected: 5.15.179 , ≤ 5.15.* (semver)
Unaffected: 6.1.129 , ≤ 6.1.* (semver)
Unaffected: 6.6.79 , ≤ 6.6.* (semver)
Unaffected: 6.12.16 , ≤ 6.12.* (semver)
Unaffected: 6.13.4 , ≤ 6.13.* (semver)
Unaffected: 6.14 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86: Reject Hyper-V\u0027s SEND_IPI hypercalls if local APIC isn\u0027t in-kernel\n\nAdvertise support for Hyper-V\u0027s SEND_IPI and SEND_IPI_EX hypercalls if and\nonly if the local API is emulated/virtualized by KVM, and explicitly reject\nsaid hypercalls if the local APIC is emulated in userspace, i.e. don\u0027t rely\non userspace to opt-in to KVM_CAP_HYPERV_ENFORCE_CPUID.\n\nRejecting SEND_IPI and SEND_IPI_EX fixes a NULL-pointer dereference if\nHyper-V enlightenments are exposed to the guest without an in-kernel local\nAPIC:\n\n  dump_stack+0xbe/0xfd\n  __kasan_report.cold+0x34/0x84\n  kasan_report+0x3a/0x50\n  __apic_accept_irq+0x3a/0x5c0\n  kvm_hv_send_ipi.isra.0+0x34e/0x820\n  kvm_hv_hypercall+0x8d9/0x9d0\n  kvm_emulate_hypercall+0x506/0x7e0\n  __vmx_handle_exit+0x283/0xb60\n  vmx_handle_exit+0x1d/0xd0\n  vcpu_enter_guest+0x16b0/0x24c0\n  vcpu_run+0xc0/0x550\n  kvm_arch_vcpu_ioctl_run+0x170/0x6d0\n  kvm_vcpu_ioctl+0x413/0xb20\n  __se_sys_ioctl+0x111/0x160\n  do_syscal1_64+0x30/0x40\n  entry_SYSCALL_64_after_hwframe+0x67/0xd1\n\nNote, checking the sending vCPU is sufficient, as the per-VM irqchip_mode\ncan\u0027t be modified after vCPUs are created, i.e. if one vCPU has an\nin-kernel local APIC, then all vCPUs have an in-kernel local APIC."
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          "url": "https://git.kernel.org/stable/c/45fa526b0f5a34492ed0536c3cdf88b78380e4de"
        },
        {
          "url": "https://git.kernel.org/stable/c/5393cf22312418262679eaadb130d608c75fe690"
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          "url": "https://git.kernel.org/stable/c/874ff13c73c45ecb38cb82191e8c1d523f0dc81b"
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          "url": "https://git.kernel.org/stable/c/ca29f58ca374c40a0e69c5306fc5c940a0069074"
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        {
          "url": "https://git.kernel.org/stable/c/a8de7f100bb5989d9c3627d3a223ee1c863f3b69"
        }
      ],
      "title": "KVM: x86: Reject Hyper-V\u0027s SEND_IPI hypercalls if local APIC isn\u0027t in-kernel",
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    "datePublished": "2025-02-27T02:18:23.001Z",
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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