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.
This issue can be reached over the network, attack complexity is high, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality low, integrity low, availability high.
The score comes from this vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H
CVE-2024-6409 is classified as CWE-364: Signal Handler Race Condition. The product uses a signal handler that introduces a race condition.
CVE-2024-6409 is recorded against 1 package.
Published on 8 July 2024 and last revised on 17 June 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.
access.redhat.com
access.redhat.com
access.redhat.com
access.redhat.com
access.redhat.com
access.redhat.com
access.redhat.com
access.redhat.com
bugzilla.redhat.com
www.openwall.com
www.openwall.com
www.openwall.com
www.openwall.com
www.openwall.com
access.redhat.com
access.redhat.com
access.redhat.com
access.redhat.com
almalinux.org
bugzilla.redhat.com
bugzilla.suse.com
explore.alas.aws.amazon.com
github.com
security-tracker.debian.org
security.netapp.com
sig-security.rocky.page
ubuntu.com
www.suse.com
unknown has other advisories on record. If you are patching this one, these are worth checking on the same host:
These advisories are the same class of weakness (CWE-364: Signal Handler Race Condition) in other software:
Details
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H
Affected Packages
| Software | From version | Fixed in |
|---|---|---|
| unknown | — | — |
References
Similar Threats
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