Out-of-bounds read in Linux kernel KSMBD

1) Out-of-bounds read

EUVDB-ID: #VU82661

Risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-3867

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

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition within the KSMBD implementation in the Linux kernel. A remote attacker can trigger an out-of-bounds read error and read contents of memory on the system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Linux kernel: before 6.5 rc1

CPE2.3

External links

http://www.zerodayinitiative.com/advisories/ZDI-23-981/
http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7b7d709ef7cf285309157fb94c33f625dd22c5e1
http://lore.kernel.org/all/20230624040141.16088-1-linkinjeon@kernel.org/

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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