Openssh: double free in red hat enterprise linux versions of openssh dh-gex client path during fips known-group validation leads to…

Summary

A flaw was found in OpenSSH. A malicious SSH server can exploit a double free vulnerability in the Diffie-Hellman Group Exchange (DH-GEX) client path. This occurs during FIPS (Federal Information Processing Standards) mode known-group validation when the client processes attacker-controlled DH-GEX group parameters. Successful exploitation leads to client-side process termination, resulting in a Denial of Service (DoS).

Timeline

1. Jun 23, 2026, 3:36 AM UTCCVE published
2. Jun 23, 2026, 2:30 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: partial

3. Oct 30, 2026, 7:43 AM UTCRecord last updated

Affected versions

• openssh

  Version range not reported

• openssh

  Version range not reported

• openssh

  Version range not reported

• openssh

  Version range not reported

• openssh

  Version range not reported

• openssh

  Version range not reported

• openssh

  Version range not reported

• openssh-main

  Version range not reported

• rhai/base-image-cuda-rhel9

  Version range not reported

• rhai/base-image-cpu-rhel9

  Version range not reported

• rhai/base-image-spyre-rhel9

  Version range not reported

• rhai/base-image-tpu-rhel9

  Version range not reported

• rhai/base-image-rocm-rhel9

  Version range not reported

• rhai/base-image-spyre-rhel9

  Version range not reported

• rhai/base-image-cpu-rhel9

  Version range not reported

• rhai/base-image-tpu-rhel9

  Version range not reported

• rhai/base-image-cuda-rhel9

  Version range not reported

• rhai/base-image-rocm-rhel9

  Version range not reported

• rhai/base-image-tpu-rhel9

  Version range not reported

• rhai/base-image-rocm-6.4-rhel9

  Version range not reported

• rhai/base-image-cuda-12.9-rhel9

  Version range not reported

• rhai/base-image-rocm-7.0-rhel9

  Version range not reported

• rhai/base-image-cpu-rhel9

  Version range not reported

• rhai/base-image-neuron-rhel9

  Version range not reported

• rhai/base-image-cuda-13.0-rhel9

  Version range not reported

• rhai/base-image-spyre-rhel9

  Version range not reported

• rhai/base-image-neuron-rhel9

  Version range not reported

• rhai/base-image-cuda-12.9-rhel9

  Version range not reported

• rhai/base-image-cpu-rhel9

  Version range not reported

• rhai/base-image-rocm-6.4-rhel9

  Version range not reported

• rhai/base-image-spyre-rhel9

  Version range not reported

• rhai/base-image-rocm-7.1-rhel9

  Version range not reported

• rhai/base-image-gaudi-rhel9

  Version range not reported

• rhai/base-image-tpu-rhel9

  Version range not reported

• rhai/base-image-cuda-13.0-rhel9

  Version range not reported

• rhai/base-image-spyre-rhel9

  Version range not reported

• rhai/base-image-gaudi-rhel9

  Version range not reported

• rhai/base-image-cpu-rhel9

  Version range not reported

• rhai/base-image-neuron-rhel9

  Version range not reported

• rhai/base-image-rocm-7.14-rhel9

  Version range not reported

• rhai/base-image-tpu-rhel9

  Version range not reported

• rhai/base-image-rubin-rhel9

  Version range not reported

• rhai/base-image-cuda-13.0-rhel9

  Version range not reported

• rhai/base-image-cuda-12.9-rhel9

  Version range not reported

• rhui5/installer-rhel9

  Version range not reported

• rhui5/rhua-rhel9

  Version range not reported

• rhui5/installer-tp-rhel9

  Version range not reported

• rhui5/rhua-tp-rhel9

  Version range not reported

• openssh

  Version range not reported

• openssh

  Version range not reported

• openshift/ose-rhel-coreos-8

  Version range not reported

• openshift/ose-rhel-coreos-9

  Version range not reported

• openshift/ose-rhel-coreos-9

  Version range not reported

References 25