#VU91208 Buffer overflow in Linux kernel - CVE-2021-47110

Vulnerability identifier: #VU91208

Vulnerability risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-47110

CWE-ID: CWE-119

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 escalate privileges on the system.

The vulnerability exists due to memory corruption within the kvm_crash_shutdown() and kvmclock_init() functions in arch/x86/kernel/kvmclock.c, within the kvm_guest_cpu_offline() function in arch/x86/kernel/kvm.c. A local user can escalate privileges on the system.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: All versions

---

External links
https://git.kernel.org/stable/c/9084fe1b3572664ad276f427dce575f580c9799a
https://git.kernel.org/stable/c/3b0becf8b1ecf642a9edaf4c9628ffc641e490d6
https://git.kernel.org/stable/c/1df2dc09926f61319116c80ee85701df33577d70
https://git.kernel.org/stable/c/c02027b5742b5aa804ef08a4a9db433295533046

---

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.