CVE-2024-6409Openssh: possible remote code execution due to a race condition in signal handling affecting red hat enterprise linux 9
Updated under an hour ago ()
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It affects Red Hat Enterprise Linux 9 and 6 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.0 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H
- Weakness (CWE)
- CWE-364
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- redhat
- NVD analysis
- Deferred
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 15, 2026
Affected products
Red Hat Red Hat Enterprise Linux 9 redhat:enterprise_linux | from 0:8.7p1-38.el9_4.4 not affected | CNA record |
from 0:8.7p1-12.el9_0.3 not affected | CNA record | |
Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support redhat:rhel_eus | from 0:8.7p1-30.el9_2.7 not affected | CNA record |
Red Hat Red Hat OpenShift Container Platform 4.13 redhat:openshift | from 413.92.202408122222-0 not affected | CNA record |
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.0 before V3.1.5 | CISA ADP |
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name) | from V3.1.0 before V3.1.5 | CISA ADP |
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.0 before V3.1.5 | CISA ADP |
References
- https://access.redhat.com/errata/RHSA-2024:4457vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2024:4613vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2024:4716vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2024:4910vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2024:4955vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2024:4960vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2024:5444vendor-advisory, x-refsource-redhat
- https://access.redhat.com/security/cve/CVE-2024-6409vdb-entry, x-refsource-redhat
- https://bugzilla.redhat.com/show_bug.cgi?id=2295085issue-tracking, x-refsource-redhat
- http://www.openwall.com/lists/oss-security/2024/07/08/2
- http://www.openwall.com/lists/oss-security/2024/07/09/2
- http://www.openwall.com/lists/oss-security/2024/07/09/5
- http://www.openwall.com/lists/oss-security/2024/07/10/1
- http://www.openwall.com/lists/oss-security/2024/07/10/2
- https://almalinux.org/blog/2024-07-09-cve-2024-6409/
- https://bugzilla.suse.com/show_bug.cgi?id=1227217
- https://explore.alas.aws.amazon.com/CVE-2024-6409.html
- https://github.com/openela-main/openssh/commit/c00da7741d42029e49047dd89e266d91dcfbffa0
- https://security-tracker.debian.org/tracker/CVE-2024-6409
- https://security.netapp.com/advisory/ntap-20240712-0003/
- https://sig-security.rocky.page/issues/CVE-2024-6409/
- https://ubuntu.com/security/CVE-2024-6409
- https://www.suse.com/security/cve/CVE-2024-6409.html
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.