#VU82661 Out-of-bounds read in Linux kernel - CVE-2023-3867

Vulnerability identifier: #VU82661

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2023-3867

CWE-ID: CWE-125

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Linux kernel
Operating systems & Components / Operating system

Vendor: Linux Foundation

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, 6.5

---

External links
https://www.zerodayinitiative.com/advisories/ZDI-23-981/
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7b7d709ef7cf285309157fb94c33f625dd22c5e1
https://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.