github - ghsa-6hw2-3r9f-pmmj

ghsa-6hw2-3r9f-pmmj

Vulnerability from github

Published

2024-06-20 12:31

Modified

2024-06-20 12:31

Details

In the Linux kernel, the following vulnerability has been resolved:

KVM: LAPIC: Also cancel preemption timer during SET_LAPIC

The below warning is splatting during guest reboot.

------------[ cut here ]------------ WARNING: CPU: 0 PID: 1931 at arch/x86/kvm/x86.c:10322 kvm_arch_vcpu_ioctl_run+0x874/0x880 [kvm] CPU: 0 PID: 1931 Comm: qemu-system-x86 Tainted: G I 5.17.0-rc1+ #5 RIP: 0010:kvm_arch_vcpu_ioctl_run+0x874/0x880 [kvm] Call Trace: kvm_vcpu_ioctl+0x279/0x710 [kvm] __x64_sys_ioctl+0x83/0xb0 do_syscall_64+0x3b/0xc0 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fd39797350b

This can be triggered by not exposing tsc-deadline mode and doing a reboot in the guest. The lapic_shutdown() function which is called in sys_reboot path will not disarm the flying timer, it just masks LVTT. lapic_shutdown() clears APIC state w/ LVT_MASKED and timer-mode bit is 0, this can trigger timer-mode switch between tsc-deadline and oneshot/periodic, which can result in preemption timer be cancelled in apic_update_lvtt(). However, We can't depend on this when not exposing tsc-deadline mode and oneshot/periodic modes emulated by preemption timer. Qemu will synchronise states around reset, let's cancel preemption timer under KVM_SET_LAPIC.

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{
  "affected": [],
  "aliases": [
    "CVE-2022-48765"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-06-20T12:15:14Z",
    "severity": null
  },
  "details": "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.",
  "id": "GHSA-6hw2-3r9f-pmmj",
  "modified": "2024-06-20T12:31:22Z",
  "published": "2024-06-20T12:31:22Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-48765"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/35fe7cfbab2e81f1afb23fc4212210b1de6d9633"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/54b3439c8e70e0bcfea59aeef9dd98908cbbf655"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ce55f63f6cea4cab8ae9212f73285648a5baa30d"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

cve-2022-48765

Vulnerability from cvelistv5

Published

2024-06-20 11:13

Modified

2024-11-04 12:16

Severity ?

Summary

KVM: LAPIC: Also cancel preemption timer during SET_LAPIC

References

▼	URL	Tags
	https://git.kernel.org/stable/c/54b3439c8e70e0bcfea59aeef9dd98908cbbf655
	https://git.kernel.org/stable/c/ce55f63f6cea4cab8ae9212f73285648a5baa30d
	https://git.kernel.org/stable/c/35fe7cfbab2e81f1afb23fc4212210b1de6d9633

Impacted products

Vendor

Product

Version

▼

Linux

Version: 1da177e4c3f4
Version: 1da177e4c3f4
Version: 1da177e4c3f4

Linux

Show details on NVD website

JSON

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Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
Confirmed: The vulnerability is confirmed from an analyst perspective.
Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
Patched: This vulnerability was successfully patched by the user reporting the sighting.
Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
Not confirmed: The user expresses doubt about the veracity of the vulnerability.
Not patched: This vulnerability was not successfully patched by the user reporting the sighting.

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