#VU108303 Improper locking in Linux kernel - CVE-2022-49850

Cybersecurity Help s.r.o.

Published: 2025-05-02 | Updated: 2025-05-10

Vulnerability identifier: #VU108303

Vulnerability risk: Low

CVSSv4.0: 4.3 [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

Exploit availability: No

Vulnerable software:
Linux kernel
Operating systems & Components / Operating system

Vendor: Linux Foundation

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.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: 4.19, 4.19.1, 4.19.2, 4.19.3, 4.19.4, 4.19.5, 4.19.6, 4.19.7, 4.19.8, 4.19.9, 4.19.10, 4.19.11, 4.19.12, 4.19.13, 4.19.14, 4.19.15, 4.19.16, 4.19.17, 4.19.18, 4.19.19, 4.19.20, 4.19.21, 4.19.22, 4.19.23, 4.19.24, 4.19.25, 4.19.26, 4.19.27, 4.19.28, 4.19.29, 4.19.30, 4.19.31, 4.19.32, 4.19.33, 4.19.34, 4.19.35, 4.19.36, 4.19.37, 4.19.38, 4.19.39, 4.19.40, 4.19.41, 4.19.42, 4.19.43, 4.19.44, 4.19.45, 4.19.46, 4.19.47, 4.19.48, 4.19.49, 4.19.50, 4.19.51, 4.19.52, 4.19.53, 4.19.54, 4.19.55, 4.19.56, 4.19.57, 4.19.58, 4.19.59, 4.19.60, 4.19.61, 4.19.62, 4.19.63, 4.19.64, 4.19.65, 4.19.66, 4.19.67, 4.19.68, 4.19.69, 4.19.70, 4.19.71, 4.19.72, 4.19.73, 4.19.74, 4.19.75, 4.19.76, 4.19.77, 4.19.78, 4.19.79, 4.19.80, 4.19.81, 4.19.82, 4.19.83, 4.19.84, 4.19.85, 4.19.86, 4.19.87, 4.19.88, 4.19.89, 4.19.90, 4.19.91, 4.19.92, 4.19.93, 4.19.94, 4.19.95, 4.19.96, 4.19.97, 4.19.98, 4.19.99, 4.19.100, 4.19.101, 4.19.102, 4.19.103, 4.19.104, 4.19.105, 4.19.106, 4.19.107, 4.19.108, 4.19.109, 4.19.110, 4.19.111, 4.19.112, 4.19.113, 4.19.114, 4.19.115, 4.19.116, 4.19.117, 4.19.118, 4.19.118-2, 4.19.119, 4.19.120, 4.19.121, 4.19.122, 4.19.123, 4.19.124, 4.19.125, 4.19.126, 4.19.127, 4.19.128, 4.19.129, 4.19.130, 4.19.131, 4.19.132, 4.19.133, 4.19.134, 4.19.135, 4.19.136, 4.19.137, 4.19.138, 4.19.139, 4.19.140, 4.19.141, 4.19.142, 4.19.143, 4.19.144, 4.19.145, 4.19.146, 4.19.147, 4.19.148, 4.19.149, 4.19.150, 4.19.151, 4.19.152, 4.19.153, 4.19.154, 4.19.155, 4.19.156, 4.19.157, 4.19.158, 4.19.159, 4.19.160, 4.19.161, 4.19.162, 4.19.163, 4.19.164, 4.19.165, 4.19.166, 4.19.167, 4.19.168, 4.19.169, 4.19.170, 4.19.171, 4.19.172, 4.19.173, 4.19.174, 4.19.175, 4.19.176, 4.19.177, 4.19.178, 4.19.179, 4.19.180, 4.19.181, 4.19.182, 4.19.183, 4.19.184, 4.19.185, 4.19.186, 4.19.187, 4.19.188, 4.19.189, 4.19.190, 4.19.191, 4.19.192, 4.19.193, 4.19.194, 4.19.195, 4.19.196, 4.19.197, 4.19.198, 4.19.199, 4.19.200, 4.19.201, 4.19.202, 4.19.203, 4.19.204, 4.19.205, 4.19.206, 4.19.207, 4.19.208, 4.19.209, 4.19.210, 4.19.211, 4.19.212, 4.19.213, 4.19.214, 4.19.215, 4.19.216, 4.19.217, 4.19.218, 4.19.219, 4.19.220, 4.19.221, 4.19.222, 4.19.223, 4.19.224, 4.19.225, 4.19.226, 4.19.227, 4.19.228, 4.19.229, 4.19.230, 4.19.231, 4.19.232, 4.19.233, 4.19.234, 4.19.235, 4.19.236, 4.19.237, 4.19.238, 4.19.239, 4.19.240, 4.19.241, 4.19.242, 4.19.243, 4.19.244, 4.19.245, 4.19.246, 4.19.247, 4.19.248, 4.19.249, 4.19.250, 4.19.251, 4.19.252, 4.19.253, 4.19.254, 4.19.255, 4.19.256, 4.19.257, 4.19.258, 4.19.259, 4.19.260, 4.19.261, 4.19.262, 4.19.263, 4.19.264, 4.19.265, 4.19.266

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

Latest bulletins with this vulnerability

openEuler 20.03 LTS SP4 update for kernel

Improper locking in Linux kernel x86 kvm