#VU81921 Out-of-bounds read in Linux kernel - CVE-2023-39192

Vulnerability identifier: #VU81921

Vulnerability risk: Low

CVSSv4.0: 1.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2023-39192

CWE-ID: CWE-125

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 gain access to sensitive information.

The vulnerability exists due to a boundary condition within the the u32_match_it() function in Netfilter subsystem in Linux kernel. A local user can trigger an out-of-bounds read error and gain access to sensitive information.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: before 6.6, 6.6

---

External links
https://bugzilla.redhat.com/show_bug.cgi?id=2226784
https://www.zerodayinitiative.com/advisories/ZDI-CAN-18408/
https://lore.kernel.org/all/20230828132107.18376-1-wander@redhat.com/

---

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.