Out-of-bounds read in Linux kernel x86 kvm

1) Out-of-bounds read

EUVDB-ID: #VU90300

Risk: Low

CVSSv3.1: 4.8 [AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-47390

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: No

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to an out-of-bounds read error within the ioapic_write_indirect() function in arch/x86/kvm/ioapic.c. A local user can perform a denial of service (DoS) attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: All versions

CPE2.3

External links

http://git.kernel.org/stable/c/bebabb76ad9acca8858e0371e102fb60d708e25b
http://git.kernel.org/stable/c/99a9e9b80f19fc63be005a33d76211dd23114792
http://git.kernel.org/stable/c/2f9b68f57c6278c322793a06063181deded0ad69

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.