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CVE-2024-6409— Openssh: possible remote code execution due to a race condition in signal handling affecting red hat enterprise linux 9

Quick assessment

Affected
CVE-2024-6409
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OpenSSH（OpenBSD Secure Shell）是加拿大OpenBSD计划组的一套用于安全访问远程计算机的连接工具。该工具是SSH协议的开源实现，支持对所有的传输进行加密，可有效阻止窃听、连接劫持以及其他网络级的攻击。 OpenSSH存在安全漏洞，该漏洞源于信号处理程序存在竞争条件。

CVSS 7.0 · High EPSS 27.93% · P98

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 13

VendorProduct Version RangeStatus
None None any unaffected
Red Hat Red Hat Enterprise Linux 10 any unaffected
Red Hat Red Hat Enterprise Linux 6 any unaffected
Red Hat Red Hat Enterprise Linux 7 any unaffected
Red Hat Red Hat Enterprise Linux 8 any unaffected
Red Hat Red Hat Enterprise Linux 9 0:8.7p1-38.el9_4.4< * unaffected
0:8.7p1-38.el9_4.4< * unaffected
Red Hat Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions 0:8.7p1-12.el9_0.3< * unaffected
Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support 0:8.7p1-30.el9_2.7< * unaffected
Red Hat Red Hat OpenShift Container Platform 4.13 413.92.202408122222-0< * unaffected
Red Hat Red Hat OpenShift Container Platform 4.14 414.92.202407300859-0< * unaffected
Red Hat Red Hat OpenShift Container Platform 4.15 415.92.202407301159-0< * unaffected
Red Hat Red Hat OpenShift Container Platform 4.16 416.94.202407171205-0< * unaffected

I. Basic Information for CVE-2024-6409

Vulnerability Information
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Vulnerability Title
Openssh: possible remote code execution due to a race condition in signal handling affecting red hat enterprise linux 9
Source: CVE Program / CVE List V5
Vulnerability Description
A race condition vulnerability was discovered in how signals are handled by OpenSSH's server (sshd). If a remote attacker does not authenticate within a set time period, then sshd's SIGALRM handler is called asynchronously. However, this signal handler calls various functions that are not async-signal-safe, for example, syslog(). As a consequence of a successful attack, in the worst case scenario, an attacker may be able to perform a remote code execution (RCE) as an unprivileged user running the sshd server.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
信号处理例程中的竞争条件
Source: CVE Program / CVE List V5
Vulnerability Title
OpenSSH 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenSSH（OpenBSD Secure Shell）是加拿大OpenBSD计划组的一套用于安全访问远程计算机的连接工具。该工具是SSH协议的开源实现，支持对所有的传输进行加密，可有效阻止窃听、连接劫持以及其他网络级的攻击。 OpenSSH存在安全漏洞，该漏洞源于信号处理程序存在竞争条件。
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)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
- - - -
Red Hat Red Hat Enterprise Linux 9 0:8.7p1-38.el9_4.4 ~ * cpe:/a:redhat:enterprise_linux:9::appstream
Red Hat Red Hat Enterprise Linux 9 0:8.7p1-38.el9_4.4 ~ * cpe:/a:redhat:enterprise_linux:9::appstream
Red Hat Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions 0:8.7p1-12.el9_0.3 ~ * cpe:/a:redhat:rhel_e4s:9.0::appstream
Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support 0:8.7p1-30.el9_2.7 ~ * cpe:/a:redhat:rhel_eus:9.2::appstream
Red Hat Red Hat OpenShift Container Platform 4.13 413.92.202408122222-0 ~ * cpe:/a:redhat:openshift:4.13::el8
Red Hat Red Hat OpenShift Container Platform 4.14 414.92.202407300859-0 ~ * cpe:/a:redhat:openshift:4.14::el8
Red Hat Red Hat OpenShift Container Platform 4.15 415.92.202407301159-0 ~ * cpe:/a:redhat:openshift:4.15::el8
Red Hat Red Hat OpenShift Container Platform 4.16 416.94.202407171205-0 ~ * cpe:/a:redhat:openshift:4.16::el9
Red Hat Red Hat Enterprise Linux 10 - cpe:/o:redhat:enterprise_linux:10
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 - cpe:/o:redhat:enterprise_linux:8

II. Public POCs for CVE-2024-6409

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 7980 chars
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III. Intelligence Information for CVE-2024-6409

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Patches & Fixes for CVE-2024-6409 (1)

Vendor Advisories for CVE-2024-6409 (14)

Mailing List Discussions for CVE-2024-6409 (5)

Security Blog Posts for CVE-2024-6409 (1)

Other References for CVE-2024-6409 (2)

IV. Related Vulnerabilities

Same weakness: CWE-364

V. Comments for CVE-2024-6409

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