CVE-2023-1998 (Medium) detected in linux-stable-rtv4.1

[mend-bolt-for-github[bot]]

CVE-2023-1998 - Medium Severity Vulnerability

Vulnerable Library - linux-stable-rtv4.1

Library home page: https://git.kernel.org/pub/scm/linux/kernel/git/zanussi/linux-stable-rt.git

Found in HEAD commit: d320b28538efef34097703b1fd51d4131f87b779

Found in base branch: master

Vulnerable Source Files (2)

/arch/x86/kernel/cpu/bugs.c /arch/x86/kernel/cpu/bugs.c

Vulnerability Details

The Linux kernel allows userspace processes to enable mitigations by calling prctl with PR_SET_SPECULATION_CTRL which disables the speculation feature as well as by using seccomp. We had noticed that on VMs of at least one major cloud provider, the kernel still left the victim process exposed to attacks in some cases even after enabling the spectre-BTI mitigation with prctl. The same behavior can be observed on a bare-metal machine when forcing the mitigation to IBRS on boot command line. This happened because when plain IBRS was enabled (not enhanced IBRS), the kernel had some logic that determined that STIBP was not needed. The IBRS bit implicitly protects against cross-thread branch target injection. However, with legacy IBRS, the IBRS bit was cleared on returning to userspace, due to performance reasons, which disabled the implicit STIBP and left userspace threads vulnerable to cross-thread branch target injection against which STIBP protects.

Publish Date: 2023-04-21

URL: CVE-2023-1998

CVSS 3 Score Details (5.6)

Base Score Metrics: - Exploitability Metrics: - Attack Vector: Local - Attack Complexity: High - Privileges Required: Low - User Interaction: None - Scope: Changed - Impact Metrics: - Confidentiality Impact: High - Integrity Impact: None - Availability Impact: None

For more information on CVSS3 Scores, click here.

Suggested Fix

Type: Upgrade version

Origin: https://www.linuxkernelcves.com/cves/CVE-2023-1998

Release Date: 2023-04-12

Fix Resolution: v6.1.16,v6.2.3

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[mend-bolt-for-github[bot]]

:heavy_check_mark: This issue was automatically closed by Mend because the vulnerable library in the specific branch(es) was either marked as ignored or it is no longer part of the Mend inventory.

[mend-bolt-for-github[bot]]

:information_source: This issue was automatically re-opened by Mend because the vulnerable library in the specific branch(es) has been detected in the Mend inventory.