Improper locking in Linux kernel - CVE-2022-49850
Published: May 2, 2025 / Updated: May 10, 2025
Vulnerability identifier: #VU108303
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2022-49850
CWE-ID: CWE-667
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to improper locking 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 perform a denial of service (DoS) attack.
How to mitigate CVE-2022-49850
Install update from vendor's website.
Sources
- https://git.kernel.org/stable/c/1d4ff73062096c21b47954d2996b4df259777bda
- https://git.kernel.org/stable/c/36ff974b0310771417c0be64b64aa221bd70d63d
- https://git.kernel.org/stable/c/3c89ca6d3dfa6c09c515807a7a97a521f5d5147e
- https://git.kernel.org/stable/c/8ac932a4921a96ca52f61935dbba64ea87bbd5dc
- https://git.kernel.org/stable/c/8b4506cff6630bb474bb46a2a75c31e533a756ba
- https://git.kernel.org/stable/c/abc082aac0d9b6b926038fc3adb7008306581be2
- https://git.kernel.org/stable/c/cb029b54953420f7a2d65100f1c5107f14411bdc
- https://git.kernel.org/stable/c/f0cc93080d4c09510b74ecba87fd778cca390bb1
- https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.267