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CVE-2023-4155— Sev-es / sev-snp vmgexit double fetch vulnerability

Quick assessment

Affected
n/a 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存在安全漏洞，该漏洞源于在具有安全加密虚拟化 (SEV) 的 Linux kernel（ AMD 处理器）中的 KVM 在访问 GHCB 页面时包含竞争条件，攻击者利用该漏洞可以造成拒绝服务。

CVSS 5.3 · Medium EPSS 0.17% · P6
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I. Basic Information for CVE-2023-4155

Vulnerability Information
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Vulnerability Title
Sev-es / sev-snp vmgexit double fetch vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in KVM AMD Secure Encrypted Virtualization (SEV) in the Linux kernel. A KVM guest using SEV-ES or SEV-SNP with multiple vCPUs can trigger a double fetch race condition vulnerability and invoke the `VMGEXIT` handler recursively. If an attacker manages to call the handler multiple times, they can trigger a stack overflow and cause a denial of service or potentially guest-to-host escape in kernel configurations without stack guard pages (`CONFIG_VMAP_STACK`).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
检查时间与使用时间(TOCTOU)的竞争条件
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存在安全漏洞，该漏洞源于在具有安全加密虚拟化 (SEV) 的 Linux kernel（ AMD 处理器）中的 KVM 在访问 GHCB 页面时包含竞争条件，攻击者利用该漏洞可以造成拒绝服务。
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
- kernel - -
Red Hat Red Hat Enterprise Linux 6 - cpe:/o:redhat:enterprise_linux:6
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9
Fedora Fedora - -

II. Public POCs for CVE-2023-4155

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III. Intelligence Information for CVE-2023-4155

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Vendor Advisories for CVE-2023-4155 (2)

Same Patch Batch · n/a · 2023-09-13 · 12 CVEs total

CVE-2023-2680 7.5 HIGH Dma reentrancy issue (incomplete fix for cve-2021-3750)
CVE-2023-3301 5.6 MEDIUM Triggerable assertion due to race condition in hot-unplug
CVE-2023-41162 Webmin Usermin 跨站脚本漏洞
CVE-2023-41158 Webmin Usermin 跨站脚本漏洞
CVE-2023-41155 Usermin 跨站脚本漏洞
CVE-2023-41154 Usermin 跨站脚本漏洞
CVE-2023-41152 Webmin Usermin 跨站脚本漏洞
CVE-2023-40617 Open Knowledge Maps Head Start 7 跨站脚本漏洞
CVE-2023-42468 Color Phone 安全漏洞
CVE-2023-40850 Netcon NS-ASG 安全漏洞
CVE-2023-42469 com.full.dialer.top.secure.crypted 安全漏洞

IV. Related Vulnerabilities

Same product: kernel
Same vendor: n/a
Same weakness: CWE-367

V. Comments for CVE-2023-4155

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