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CVE-2026-120831— Libslirp: libslirp: queue pointer corruption in if_output() leading to denial of service

Quick assessment

Affected
Red Hat Red Hat Enterprise Linux 10
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.

在 libslirp 库的 函数中发现了一个缺陷。当将会话从快速队列移至批量队列时，代码通过 对任意数据包进行了unlink（解除链接）和重新插入操作，而非针对会话队列头部执行该操作，从而导致队列指针损坏。若客户机生成突发流量，可能致使主机网络进程崩溃，进而引发拒绝服务（DoS）攻击。

CVSS 6.5 · Medium

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-120831

Vulnerability Information
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Vulnerability Title
Libslirp: libslirp: queue pointer corruption in if_output() leading to denial of service
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in libslirp in if_output(). When moving a session from the fast queue to the batch queue, the code unlinked and reinserted an arbitrary packet via ifm->m_nextpkt instead of the session queue head, corrupting queue pointers. A guest generating burst traffic could crash the host networking process, causing a denial of service.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Enterprise Linux 10 - cpe:/o:redhat:enterprise_linux:10
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 OpenShift Container Platform 4 - cpe:/a:redhat:openshift:4
Red Hat Red Hat OpenShift Container Platform 4 - cpe:/a:redhat:openshift:4
Red Hat Red Hat OpenShift Container Platform 4 - cpe:/a:redhat:openshift:4
Red Hat Red Hat OpenShift Container Platform 5 - cpe:/a:redhat:openshift:5

II. Public POCs for CVE-2026-120831

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III. Intelligence Information for CVE-2026-120831

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Other References for CVE-2026-120831 (3)

Same Patch Batch · Red Hat · 2026-11-03 · 3 CVEs total

CVE-2026-120830 7.4 HIGH Libslirp: libslirp: out-of-bounds heap read in icmp_forward_error() leading to information
CVE-2026-120971 5.3 MEDIUM Org.jboss.resteasy/resteasy-core: resteasy: information disclosure through default excepti

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-787