CVE-2023-6240 Kernel: marvin vulnerability side-channel leakage in the rsa decryption operation

What is CVE-2023-6240?

CVE-2023-6240 is a medium-severity vulnerability in Linux kernel, published on 4 Feb 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A Marvin vulnerability side-channel leakage was found in the RSA decryption operation in the Linux Kernel. This issue may allow a network attacker to decrypt ciphertexts or forge signatures, limiting the services that use that private key.

Weakness: CWE-203

Which versions are affected by CVE-2023-6240?

It affects 2 products.

Products include Linux kernel, Redhat Enterprise Linux.

How do I fix CVE-2023-6240?

Apply the vendor's patch.

Is CVE-2023-6240 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-6240 exists.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BELL-CVE-2023-6240, DEBIAN-CVE-2023-6240, GHSA-5gvr-285q-pwc3, ROOT-OS-DEBIAN-11-CVE-2023-6240, ROOT-OS-DEBIAN-12-CVE-2023-6240, ROOT-OS-DEBIAN-13-CVE-2023-6240 and 2 more.