Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 214ff83d4473a7757fa18a64dc7efe3b0e158486 before 61224533f2b61e252b03e214195d27d64b22989a; affected 214ff83d4473a7757fa18a64dc7efe3b0e158486 before 45fa526b0f5a34492ed0536c3cdf88b78380e4de; affected 214ff83d4473a7757fa18a64dc7efe3b0e158486 before 5393cf22312418262679eaadb130d608c75fe690; affected 214ff83d4473a7757fa18a64dc7efe3b0e158486 before 874ff13c73c45ecb38cb82191e8c1d523f0dc81b; affected 214ff83d4473a7757fa18a64dc7efe3b0e158486 before aca8be4403fb90db7adaf63830e27ebe787a76e8; affected 214ff83d4473a7757fa18a64dc7efe3b0e158486 before ca29f58ca374c40a0e69c5306fc5c940a0069074; affected 214ff83d4473a7757fa18a64dc7efe3b0e158486 before a8de7f100bb5989d9c3627d3a223ee1c863f3b69 |
| Linux / Linux | affected 4.20; unaffected 0 before 4.20; unaffected 5.10.236 through 5.10.*; unaffected 5.15.179 through 5.15.*; unaffected 6.1.129 through 6.1.*; unaffected 6.6.79 through 6.6.*; unaffected 6.12.16 through 6.12.*; unaffected 6.13.4 through 6.13.*; unaffected 6.14 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/61224533f2b61e252b03e214195d27d64b22989a
- https://git.kernel.org/stable/c/45fa526b0f5a34492ed0536c3cdf88b78380e4de
- https://git.kernel.org/stable/c/5393cf22312418262679eaadb130d608c75fe690
- https://git.kernel.org/stable/c/874ff13c73c45ecb38cb82191e8c1d523f0dc81b
- https://git.kernel.org/stable/c/aca8be4403fb90db7adaf63830e27ebe787a76e8
- https://git.kernel.org/stable/c/ca29f58ca374c40a0e69c5306fc5c940a0069074
- https://git.kernel.org/stable/c/a8de7f100bb5989d9c3627d3a223ee1c863f3b69
ADP enrichment
No English description supplied.
No English description supplied.