Infinite loop in Linux kernel - CVE-2025-21839
Published: March 10, 2025 / Updated: May 11, 2025
Vulnerability identifier: #VU105468
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-2025-21839
CWE-ID: CWE-835
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 infinite loop within the vcpu_enter_guest() function in arch/x86/kvm/x86.c, within the vmx_sync_dirty_debug_regs() and vmx_vcpu_run() functions in arch/x86/kvm/vmx/vmx.c, within the new_asid() and svm_vcpu_run() functions in arch/x86/kvm/svm/svm.c. A local user can perform a denial of service (DoS) attack.
How to mitigate CVE-2025-21839
Install update from vendor's website.