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CVE-2024-2494— Libvirt: negative g_new0 length can lead to unbounded memory allocation

Quick assessment

Affected
Red Hat Red Hat Enterprise Linux 8
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.

Red Hat libvirt是美国红帽（Red Hat）公司的一个用于实现Linux虚拟化功能的Linux API，它支持各种Hypervisor，包括Xen和KVM，以及QEMU和用于其他操作系统的一些虚拟产品。 Red Hat libvirt存在安全漏洞，该漏洞源于RPC库的API存在安全漏洞，将负长度传递给g_new0函数会导致崩溃。攻击者可利用该漏洞执行拒绝服务（DOS）攻击。

CVSS 6.2 · Medium EPSS 0.37% · P29

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2024-2494

Vulnerability Information
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Vulnerability Title
Libvirt: negative g_new0 length can lead to unbounded memory allocation
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in the RPC library APIs of libvirt. The RPC server deserialization code allocates memory for arrays before the non-negative length check is performed by the C API entry points. Passing a negative length to the g_new0 function results in a crash due to the negative length being treated as a huge positive number. This flaw allows a local, unprivileged user to perform a denial of service attack by causing the libvirt daemon to crash.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的内存分配
Source: CVE Program / CVE List V5
Vulnerability Title
Red Hat libvirt 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Red Hat libvirt是美国红帽（Red Hat）公司的一个用于实现Linux虚拟化功能的Linux API，它支持各种Hypervisor，包括Xen和KVM，以及QEMU和用于其他操作系统的一些虚拟产品。 Red Hat libvirt存在安全漏洞，该漏洞源于RPC库的API存在安全漏洞，将负长度传递给g_new0函数会导致崩溃。攻击者可利用该漏洞执行拒绝服务（DOS）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
Red Hat Red Hat Enterprise Linux 8 8100020240409073027.489197e6 ~ * cpe:/a:redhat:enterprise_linux:8::appstream
Red Hat Red Hat Enterprise Linux 8 8100020240409073027.489197e6 ~ * cpe:/a:redhat:enterprise_linux:8::appstream
Red Hat Red Hat Enterprise Linux 9 0:10.0.0-6.2.el9_4 ~ * cpe:/a:redhat:enterprise_linux:9::appstream
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 8 Advanced Virtualization - cpe:/a:redhat:advanced_virtualization:8::el8

II. Public POCs for CVE-2024-2494

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III. Intelligence Information for CVE-2024-2494

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Vendor Advisories for CVE-2024-2494 (4)

Mailing List Discussions for CVE-2024-2494 (2)

IV. Related Vulnerabilities

Same weakness: CWE-789