Observable discrepancy in Linux kernel - CVE-2023-6240

Vulnerability identifier: #VU89003

CSH Severity: Medium

CVSS v4: 6.9 [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]

CVE-ID: CVE-2023-6240

CWE-ID: CWE-203

Exploitation vector: Remote access

Exploit availability: No public exploit available

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.

Linux kernel
Red Hat Enterprise Linux for Real Time
Anolis OS
Red Hat Enterprise Linux for Real Time for NFV
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Red Hat CodeReady Linux Builder for x86_64
Red Hat CodeReady Linux Builder for Power, little endian
Red Hat CodeReady Linux Builder for ARM 64
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Red Hat Enterprise Linux Server - AUS
Red Hat OpenShift Container Platform
Juniper Secure Analytics (JSA)
IBM Qradar SIEM
Storage Virtualize
Storage Copy Data Management
Technical Support Appliance
IBM Cloud Pak for Watson AIOps
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
kernel (Red Hat package)
kernel-rt (Red Hat package)
kernel-tools
kernel-modules
kernel-modules-extra
bpftool
kernel
kernel-core
kernel-cross-headers
kernel-debug
kernel-debug-core
kernel-debug-devel
kernel-debug-modules
kernel-debug-modules-extra
kernel-devel
kernel-headers
kernel-tools-libs
kernel-tools-libs-devel
perf
python3-perf
kernel-abi-stablelists
kernel-doc
Juniper Junos Space
IBM Security Verify Access
IBM Storage Scale System
Red Hat Migration Toolkit for Applications

Install updates from vendor's website.

Red Hat OpenShift Container Platform - update to 4.15.10
Juniper Secure Analytics (JSA) - update to 7.5.0 UP9 IF02
IBM Qradar SIEM - update to 7.5.0 Update Pack 9 IF01
Storage Virtualize - addressed in versions 8.4.0.16, 8.5.0.14, 8.6.0.6, 8.7.0.3, 8.7.2.0
Juniper Junos Space - update to 24.1R2
Storage Copy Data Management - update to 2.2.24.1
Technical Support Appliance - update to 3.0.1
IBM Cloud Pak for Watson AIOps - update to 4.6.0
kernel (Red Hat package) - addressed in versions 4.18.0-553.5.1.el8_10, 5.14.0-70.101.1.el9_0, 5.14.0-284.62.1.el9_2, 5.14.0-427.16.1.el9_4
kernel-rt (Red Hat package) - addressed in versions 4.18.0-553.5.1.rt7.346.el8_10, 5.14.0-70.101.1.rt21.173.el9_0, 5.14.0-284.62.1.rt14.347.el9_2
kernel-tools - update to 4.18.0-553.5.1.0.1
kernel-modules - update to 4.18.0-553.5.1.0.1
kernel-modules-extra - update to 4.18.0-553.5.1.0.1
bpftool - update to 4.18.0-553.5.1.0.1
kernel - update to 4.18.0-553.5.1.0.1
kernel-core - update to 4.18.0-553.5.1.0.1
kernel-cross-headers - update to 4.18.0-553.5.1.0.1
kernel-debug - update to 4.18.0-553.5.1.0.1
kernel-debug-core - update to 4.18.0-553.5.1.0.1
kernel-debug-devel - update to 4.18.0-553.5.1.0.1
kernel-debug-modules - update to 4.18.0-553.5.1.0.1
kernel-debug-modules-extra - update to 4.18.0-553.5.1.0.1
kernel-devel - update to 4.18.0-553.5.1.0.1
kernel-headers - update to 4.18.0-553.5.1.0.1
kernel-tools-libs - update to 4.18.0-553.5.1.0.1
kernel-tools-libs-devel - update to 4.18.0-553.5.1.0.1
perf - update to 4.18.0-553.5.1.0.1
python3-perf - update to 4.18.0-553.5.1.0.1
kernel-abi-stablelists - update to 4.18.0-553.5.1.0.1
kernel-doc - update to 4.18.0-553.5.1.0.1
IBM Storage Scale System - addressed in versions 6.1.9.4, 6.2.1.0
Red Hat Migration Toolkit for Applications - update to 7.0.3
IBM Security Verify Access - update to 10.0.9

• 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

• Marvin attack in Linux kernel
• Red Hat Enterprise Linux 9.2 Extended Update Support update for kernel-rt
• Multiple vulnerabilities in Red Hat OpenShift Container Platform 4.15
• Red Hat Enterprise Linux 9.2 Extended Update Support update for kernel
• Red Hat Enterprise Linux 9 update for kernel
• Red Hat Enterprise Linux 9.0 Extended Update Support update for kernel-rt
• Red Hat Enterprise Linux 9.0 Extended Update Support update for kernel
• Red Hat Enterprise Linux 8 update for kernel-rt
• Red Hat Enterprise Linux 8 update for kernel
• Multiple vulnerabilities in IBM Cloud Pak for AIOps
• Multiple vulnerabilities in IBM QRadar SIEM
• Multiple vulnerabilities in Juniper Secure Analytics (JSA)
• Multiple vulnerabilities in IBM Storage Copy Data Management
• Multiple vulnerabilities in IBM Storage Scale System
• Multiple vulnerabilities in IBM Technical Support Appliance
• Multiple vulnerabilities in Junos Space
• Multiple vulnerabilities in IBM Security Verify Access
• IBM Storage Virtualize update for Linux Kernel
• Anolis OS update for kernel
• Multiple vulnerabilities in Red Hat Migration Toolkit for Applications 7.0