cve-2022-48765
Vulnerability from cvelistv5
Published
2024-06-20 11:13
Modified
2024-09-11 17:34
Severity ?
Summary
KVM: LAPIC: Also cancel preemption timer during SET_LAPIC
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/35fe7cfbab2e81f1afb23fc4212210b1de6d9633
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/54b3439c8e70e0bcfea59aeef9dd98908cbbf655
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ce55f63f6cea4cab8ae9212f73285648a5baa30d
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website

To clipboard 

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                "id": "CVE-2022-48765",
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          "product": "Linux",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: LAPIC: Also cancel preemption timer during SET_LAPIC\n\nThe below warning is splatting during guest reboot.\n\n  ------------[ cut here ]------------\n  WARNING: CPU: 0 PID: 1931 at arch/x86/kvm/x86.c:10322 kvm_arch_vcpu_ioctl_run+0x874/0x880 [kvm]\n  CPU: 0 PID: 1931 Comm: qemu-system-x86 Tainted: G          I       5.17.0-rc1+ #5\n  RIP: 0010:kvm_arch_vcpu_ioctl_run+0x874/0x880 [kvm]\n  Call Trace:\n   \u003cTASK\u003e\n   kvm_vcpu_ioctl+0x279/0x710 [kvm]\n   __x64_sys_ioctl+0x83/0xb0\n   do_syscall_64+0x3b/0xc0\n   entry_SYSCALL_64_after_hwframe+0x44/0xae\n  RIP: 0033:0x7fd39797350b\n\nThis can be triggered by not exposing tsc-deadline mode and doing a reboot in\nthe guest. The lapic_shutdown() function which is called in sys_reboot path\nwill not disarm the flying timer, it just masks LVTT. lapic_shutdown() clears\nAPIC state w/ LVT_MASKED and timer-mode bit is 0, this can trigger timer-mode\nswitch between tsc-deadline and oneshot/periodic, which can result in preemption\ntimer be cancelled in apic_update_lvtt(). However, We can\u0027t depend on this when\nnot exposing tsc-deadline mode and oneshot/periodic modes emulated by preemption\ntimer. Qemu will synchronise states around reset, let\u0027s cancel preemption timer\nunder KVM_SET_LAPIC."
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    "assignerShortName": "Linux",
    "cveId": "CVE-2022-48765",
    "datePublished": "2024-06-20T11:13:41.830Z",
    "dateReserved": "2024-06-20T11:09:39.060Z",
    "dateUpdated": "2024-09-11T17:34:47.369Z",
    "state": "PUBLISHED"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2022-48765\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-06-20T12:15:14.530\",\"lastModified\":\"2024-06-20T12:43:25.663\",\"vulnStatus\":\"Awaiting Analysis\",\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nKVM: LAPIC: Also cancel preemption timer during SET_LAPIC\\n\\nThe below warning is splatting during guest reboot.\\n\\n  ------------[ cut here ]------------\\n  WARNING: CPU: 0 PID: 1931 at arch/x86/kvm/x86.c:10322 kvm_arch_vcpu_ioctl_run+0x874/0x880 [kvm]\\n  CPU: 0 PID: 1931 Comm: qemu-system-x86 Tainted: G          I       5.17.0-rc1+ #5\\n  RIP: 0010:kvm_arch_vcpu_ioctl_run+0x874/0x880 [kvm]\\n  Call Trace:\\n   \u003cTASK\u003e\\n   kvm_vcpu_ioctl+0x279/0x710 [kvm]\\n   __x64_sys_ioctl+0x83/0xb0\\n   do_syscall_64+0x3b/0xc0\\n   entry_SYSCALL_64_after_hwframe+0x44/0xae\\n  RIP: 0033:0x7fd39797350b\\n\\nThis can be triggered by not exposing tsc-deadline mode and doing a reboot in\\nthe guest. The lapic_shutdown() function which is called in sys_reboot path\\nwill not disarm the flying timer, it just masks LVTT. lapic_shutdown() clears\\nAPIC state w/ LVT_MASKED and timer-mode bit is 0, this can trigger timer-mode\\nswitch between tsc-deadline and oneshot/periodic, which can result in preemption\\ntimer be cancelled in apic_update_lvtt(). However, We can\u0027t depend on this when\\nnot exposing tsc-deadline mode and oneshot/periodic modes emulated by preemption\\ntimer. Qemu will synchronise states around reset, let\u0027s cancel preemption timer\\nunder KVM_SET_LAPIC.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/35fe7cfbab2e81f1afb23fc4212210b1de6d9633\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/54b3439c8e70e0bcfea59aeef9dd98908cbbf655\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ce55f63f6cea4cab8ae9212f73285648a5baa30d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
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