5.6
CVSSv3

CVE-2023-1998

Published: 21/04/2023 Updated: 03/05/2023
CVSS v3 Base Score: 5.6 | Impact Score: 4 | Exploitability Score: 1.1
VMScore: 0

Vulnerability Summary

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.

Vulnerability Trend

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linux linux kernel

debian debian linux 10.0

Vendor Advisories

概要 Important: kernel security, bug fix, and enhancement update タイプ/重大度 Security Advisory: Important Red Hat Insights パッチ分析 このアドバイザリーの影響を受けるシステムを特定し、修正します。 影響を受けるシステムの表示 トピック An update for kernel is now available ...
Synopsis Important: kernel-rt security and bug fix update Type/Severity Security Advisory: Important Red Hat Insights patch analysis Identify and remediate systems affected by this advisory View affected systems Topic An update for kernel-rt is now available for Red Hat Enterprise Linux 9Red Hat Product Security has rated this upd ...
Synopsis Important: kernel security and bug fix update Type/Severity Security Advisory: Important Red Hat Insights patch analysis Identify and remediate systems affected by this advisory View affected systems Topic An update for kernel is now available for Red Hat Enterprise Linux 90 Extended Update SupportRed Hat Product Securit ...
Synopsis Important: OpenShift Virtualization 4133 Images security and bug fix update Type/Severity Security Advisory: Important Topic Red Hat OpenShift Virtualization release 4133 is now available with updates to packages and images that fix several bugs and add enhancementsRed Hat Product Security has rated this update as having a secur ...
Synopsis Important: kernel-rt security and bug fix update Type/Severity Security Advisory: Important Red Hat Insights patch analysis Identify and remediate systems affected by this advisory View affected systems Topic An update for kernel-rt is now available for Red Hat Enterprise Linux 90 Extended Update SupportRed Hat Product S ...
Synopsis Moderate: OpenShift Container Platform 4138 bug fix and security update Type/Severity Security Advisory: Moderate Topic Red Hat OpenShift Container Platform release 4138 is now available with updates to packages and images that fix several bugs and add enhancementsThis release includes a security update for Red Hat OpenShift Con ...
Synopsis Important: kernel security, bug fix, and enhancement update Type/Severity Security Advisory: Important Red Hat Insights patch analysis Identify and remediate systems affected by this advisory View affected systems Topic An update for kernel is now available for Red Hat Enterprise Linux 9Red Hat Product Security has rated ...
Synopsis Low: Logging Subsystem 5710 - Red Hat OpenShift security update Type/Severity Security Advisory: Low Topic Low: Logging Subsystem 5710 - Red Hat OpenShift security updateRed Hat Product Security has rated this update as having a security impact of low A Common Vulnerability Scoring System (CVSS) base score, which gives a detaile ...
概要 Important: OpenShift Container Platform 411 low-latency extras update タイプ/重大度 Security Advisory: Important トピック An update for cnf-tests-container, dpdk-base-container and performance-addon-operator-must-gather-rhel8-container is now available for Red Hat OpenShift Container Platform 411 Secondary scheduler builds ...
Synopsis Important: OpenShift Container Platform 41247 security update Type/Severity Security Advisory: Important Topic Red Hat OpenShift Container Platform release 41247 is now available with updates to packages and images that fix several bugs and add enhancementsThis release includes a security update for Red Hat OpenShift Container P ...
Description<!----> This CVE is under investigation by Red Hat Product Security ...