CVE-2026-3497

Summary

Vulnerability in the OpenSSH GSSAPI delta included in various Linux distributions. This vulnerability affects the GSSAPI patches added by various Linux distributions and does not affect the OpenSSH upstream project itself. The usage of sshpkt_disconnect() on an error, which does not terminate the process, allows an attacker to send an unexpected GSSAPI message type during the GSSAPI key exchange to the server, which will call the underlying function and continue the execution of the program without setting the related connection variables. As the variables are not initialized to NULL the code later accesses those uninitialized variables, accessing random memory, which could lead to undefined behavior. The recommended workaround is to use ssh_packet_disconnect() instead, which does terminate the process. The impact of the vulnerability depends heavily on the compiler flag hardening configuration.

Affected Software

VendorProductVersion RangeStatus
Ubuntuopenssh1:10.0p1-5ubuntu5 < 1:10.0p1-5ubuntu5.1affected
Ubuntuopenssh1:9.6p1-3ubuntu13 < 1:9.6p1-3ubuntu13.15affected
Ubuntuopenssh1:8.9p1-3 < 1:8.9p1-3ubuntu0.14affected

Weaknesses

  • CWE-908: CWE-908 Use of Uninitialized Resource

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: yes
    • Technical Impact: partial

CVE Program Container

Additional References

openssh: OpenSSH GSSAPI: Information disclosure or denial of service due to uninitialized variables

Additional References

References