USN-8090-2
Unknown
USN-8090-2: OpenSSH vulnerabilities
Canonical (Ubuntu)
Released: March 12, 2026
Updated: March 16, 2026
Restart Required
Description
USN-8090-1 fixed vulnerabilities in OpenSSH. This update provides the
corresponding updates for Ubuntu 20.04 LTS.
Original advisory details:
Jeremy Brown discovered that the OpenSSH GSSAPI Key Exchange incorrectly
handled disconnecting clients. In non-default configurations where the
GSSAPIKeyExchange setting is enabled, a remote attacker could use this
issue to cause OpenSSH to crash, resulting in a denial of service, or
possibly execute arbitrary code. (CVE-2026-3497)
David Leadbeater discovered that OpenSSH incorrectly handled certain
control characters in usernames. When untrusted usernames and the
ProxyCommand are being used, an attacker could possibly use this issue to
execute arbitrary code. (CVE-2025-61984)
David Leadbeater discovered that OpenSSH incorrectly handled NULL
characters in ssh:// URIs. When the ProxyCommand is being used, an attacker
could possibly use this issue to execute arbitrary code. (CVE-2025-61985)
Fixed Vulnerabilities 2
Mar 12, 2026
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…
Oct 06, 2025
ssh in OpenSSH before 10.1 allows control characters in usernames that originate from certain possibly untrusted sources, potentially leading to code execution when a ProxyCommand…
Quick Info
Patch ID:
USN-8090-2
Vendor:
Canonical (Ubuntu)
Severity:
Unknown
CVEs Fixed:
2
Restart:
Required
Vendor
Canonical (Ubuntu)Additional Info
action:
usn id:
USN-8090-2
summary:
Several security issues were fixed in OpenSSH.
usn number:
8090-2
instructions:
In general, a standard system update will make all the necessary changes.