Out-of-bounds read in Linux kernel

1) Out-of-bounds read

EUVDB-ID: #VU53007

Risk: Low

CVSSv3.1: 6.4 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-3506

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

Exploit availability: No

Description

The vulnerability allows a local user to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition in fs/f2fs/node.c in the f2fs module in the Linux kernel. A local user can trigger out-of-bounds read error and read internal kernel information or crash the system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Linux kernel: before 5.12 rc4

External links

http://www.mail-archive.com/linux-kernel@vger.kernel.org/msg2520013.html
http://www.openwall.com/lists/oss-security/2021/03/28/2
http://bugzilla.redhat.com/show_bug.cgi?id=1944298
http://www.openwall.com/lists/oss-security/2021/05/08/1

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.