Observable discrepancy in Linux kernel - CVE-2023-6240

Vulnerability identifier: #VU89003

CSH Severity: Medium

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

CVE-ID: CVE-2023-6240

CWE-ID: CWE-203

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerable software:
Linux kernel

Software vendor:
Linux Foundation

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

The vulnerability exists due to a timing discrepancy when handling RSA based TLS key exchanges. A remote attacker can perform a Marvin attack and gain access to sensitive information.

Install updates from vendor's website.

• https://access.redhat.com/security/cve/CVE-2023-6240
• https://bugzilla.redhat.com/show_bug.cgi?id=2250843
• https://people.redhat.com/~hkario/marvin/
• https://securitypitfalls.wordpress.com/2023/10/16/experiment-with-side-channel-attacks-yourself/
• https://access.redhat.com/errata/RHSA-2024:1881
• https://access.redhat.com/errata/RHSA-2024:1882