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CVE-2023-1998— Spectre v2 SMT mitigations problem in Linux kernel

Quick assessment

Affected
Linux Linux Kernel
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux Kernel 6.2版本存在安全漏洞，该漏洞源于启用了普通的IBRS导致用户空间进程易受攻击。

CVSS 5.6 · Medium EPSS 1.38% · P71

Public Exploits 1

ExploitDB · 1 EDB-51384 [local]

Possible ATT&CK Techniques 1 AI

T1206
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I. Basic Information for CVE-2023-1998

Vulnerability Information
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Vulnerability Title
Spectre v2 SMT mitigations problem in Linux kernel
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1303
Source: CVE Program / CVE List V5
Vulnerability Title
Linux Kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux Kernel 6.2版本存在安全漏洞，该漏洞源于启用了普通的IBRS导致用户空间进程易受攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux Kernel 0 ~ 6.3 -

II. Public POCs for CVE-2023-1998

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III. Intelligence Information for CVE-2023-1998

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Patches & Fixes for CVE-2023-1998 (1)

Vendor Advisories for CVE-2023-1998 (1)

Mailing List Discussions for CVE-2023-1998 (2)

Other References for CVE-2023-1998 (1)

IV. Related Vulnerabilities

Same product: Linux Kernel
Same vendor: Linux
Same weakness: CWE-1303

V. Comments for CVE-2023-1998

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