SB20250502255 - Race condition in Linux kernel x86 kvm

Description

This security bulletin contains information about 1 security vulnerability.

1) Race condition (CVE-ID: CVE-2022-49884)

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a race condition within the kvm_gfn_to_pfn_cache_unmap(), kvm_gfn_to_pfn_cache_init() and kvm_gfn_to_pfn_cache_destroy() functions in virt/kvm/pfncache.c, within the kvm_xen_shared_info_init(), kvm_xen_vcpu_set_attr(), kvm_xen_init_vcpu(), kvm_xen_destroy_vcpu() and kvm_xen_destroy_vm() functions in arch/x86/kvm/xen.c, within the kvm_write_system_time(), kvm_pv_enable_async_pf_int() and kvm_arch_vcpu_create() functions in arch/x86/kvm/x86.c. A local user can escalate privileges on the system.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/52491a38b2c2411f3f0229dc6ad610349c704a41
• https://git.kernel.org/stable/c/61242001d6c9c253df7645dab090842d8da08764
• https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.0.8