Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Fixed packages 7

Vulnerabilities 3

• Medium 5.0
  CVE-2026-55655

  Openssh: local mitm of x11 forwarding via abstract unix socket pre-binding in red hat enterprise linux openssh client versions

  A flaw was found in OpenSSH. A local unprivileged attacker on a Linux client host can hijack client-side X11 forwarding connections. This is possible by pre-binding the preferred abstract X socket name when X11 forwarding is enabled and a local UNIX-domain X …

  Red Hat Red Hat Enterprise Linux 9 Red Hat Enterprise Linux 8 Red Hat Enterprise Linux 7 Linux Ubuntu Azure Linux
  Jun 23, 2026
• Medium 4.3
  CVE-2026-55653

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

  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 clie…

  Red Hat Red Hat Enterprise Linux 9 Red Hat Enterprise Linux 8 Red Hat Enterprise Linux 7 Linux Ubuntu Azure Linux
  Jun 23, 2026
• Low 3.7
  CVE-2026-55654

  Openssh: heap out-of-bounds read in red hat enterprise linux versions of openssh gssapi indicator cleanup due to missing null sentinel termination

  A flaw was found in OpenSSH. This vulnerability, a heap out-of-bounds read, occurs during the cleanup of GSSAPI (Generic Security Service Application Programming Interface) indicators when a trailing NULL termination is missing in the auth-indicators array. A…

  Red Hat Red Hat Enterprise Linux 9 Red Hat Enterprise Linux 8 Red Hat Enterprise Linux 7 Linux Debian Ubuntu
  Jun 23, 2026

References

• article
  https://images.redhat.com/
• report
  https://access.redhat.com/security/cve/CVE-2026-55655
• article
  https://access.redhat.com/security/updates/classification/
• report
  https://access.redhat.com/security/cve/CVE-2026-55654
• report
  https://access.redhat.com/security/cve/CVE-2026-55653
• advisory
  https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_36759.json
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2462351
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-55653
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-55653
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2462493
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-55654
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-55654
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2462250
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-55655
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-55655