CVE-2022-48765 (GCVE-0-2022-48765)

Vulnerability from cvelistv5 – Published: 2024-06-20 11:13 – Updated: 2025-12-23 13:20
VLAI?
Title
KVM: LAPIC: Also cancel preemption timer during SET_LAPIC
Summary
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: <TASK> 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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 8003c9ae204e21204e49816c5ea629357e283b06 , < 54b3439c8e70e0bcfea59aeef9dd98908cbbf655 (git)
Affected: 8003c9ae204e21204e49816c5ea629357e283b06 , < ce55f63f6cea4cab8ae9212f73285648a5baa30d (git)
Affected: 8003c9ae204e21204e49816c5ea629357e283b06 , < 35fe7cfbab2e81f1afb23fc4212210b1de6d9633 (git)
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    Linux Linux Affected: 4.10
Unaffected: 0 , < 4.10 (semver)
Unaffected: 5.15.19 , ≤ 5.15.* (semver)
Unaffected: 5.16.5 , ≤ 5.16.* (semver)
Unaffected: 5.17 , ≤ * (original_commit_for_fix)
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