RHBA-2025:6305MediumCVSS 5.9

Red Hat Bug Fix Advisory: openssh bug fix and enhancement update

Published
May 13, 2025
Last Modified
October 8, 2026

🔗 CVE IDs covered (1)

CVE-2025-26466 →

📋 Description

CVE-2025-26466 — openssh: Denial-of-service in OpenSSH

🎯 Affected products91

  • Red Hat Enterprise Linux AppStream (v. 10)
  • Red Hat Enterprise Linux BaseOS (v. 10)
  • openssh-0:9.9p1-7.el10_0.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • openssh-0:9.9p1-7.el10_0.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • openssh-0:9.9p1-7.el10_0.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • openssh-0:9.9p1-7.el10_0.src as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • openssh-0:9.9p1-7.el10_0.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • openssh-askpass-0:9.9p1-7.el10_0.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • openssh-askpass-0:9.9p1-7.el10_0.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • openssh-askpass-0:9.9p1-7.el10_0.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • openssh-askpass-0:9.9p1-7.el10_0.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • openssh-askpass-debuginfo-0:9.9p1-7.el10_0.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • openssh-askpass-debuginfo-0:9.9p1-7.el10_0.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • openssh-askpass-debuginfo-0:9.9p1-7.el10_0.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • openssh-askpass-debuginfo-0:9.9p1-7.el10_0.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • openssh-askpass-debuginfo-0:9.9p1-7.el10_0.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • openssh-askpass-debuginfo-0:9.9p1-7.el10_0.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • openssh-askpass-debuginfo-0:9.9p1-7.el10_0.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • openssh-askpass-debuginfo-0:9.9p1-7.el10_0.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • openssh-clients-0:9.9p1-7.el10_0.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • openssh-clients-0:9.9p1-7.el10_0.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • openssh-clients-0:9.9p1-7.el10_0.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • openssh-clients-0:9.9p1-7.el10_0.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • openssh-clients-debuginfo-0:9.9p1-7.el10_0.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • openssh-clients-debuginfo-0:9.9p1-7.el10_0.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • openssh-clients-debuginfo-0:9.9p1-7.el10_0.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • openssh-clients-debuginfo-0:9.9p1-7.el10_0.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • openssh-clients-debuginfo-0:9.9p1-7.el10_0.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • openssh-clients-debuginfo-0:9.9p1-7.el10_0.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • openssh-clients-debuginfo-0:9.9p1-7.el10_0.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • +61 more not shown

✅ Remediation

For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Workaround: This issue can be mitigated by setting the following three different options in the sshd configuration file located at: /etc/ssh/sshd_config MaxStartups: Set to a reasonable value, this option controls the maximum number of concurrent unauthenticated connections the SSH server accepts; PerSourcePenalties: Set its suboptions to a reasonable value, this option is used to help sshd to detect and drop connections that are potentially malicious for the SSH server; LoginGraceTime: Set to a resonable value, this option controls how much time the SSH server will wait the client to authenticate before dropping its connection; All the three option above needs to be set to implement a full mitigation for this vulnerability.

🔗 References (8)