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high7.5

CVE-2026-3497

Vulnerability in the OpenSSH GSSAPI delta included in various Linux distributions.

Impact

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 products

VendorProductAffected versions
CanonicalUbuntu Linux
Versions 25.10, 20.04, 22.04, 24.04
OpenbsdOpenssh
All versions
DebianDebian Linux
Version 11.0
RedhatEnterprise Linux
Versions 8.0, 9.0, 10.0

Weakness classification

CWE-908CWE-824

References