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QSN-8928-1: OpenSSH vulnerabilities

October 14, 2026

Summary

Several security issues were fixed in OpenSSH.

Details

It was discovered that OpenSSH's sftp client incorrectly handled paths returned by the server during a recursive copy operation. A remote attacker controlling the server could possibly use this issue to write files to unintended locations. (CVE-2026-106552)

It was discovered that OpenSSH's sshd server incorrectly handled GSSAPIAuthentication state across authentication attempts. An attacker could possibly use this issue to obtain credentials from a previous failed authentication attempt. (CVE-2026-106553, CVE-2026-106555)

It was discovered that OpenSSH incorrectly used an LZ77 dictionary coder during compression. An attacker could possibly use this issue to obtain sensitive information. (CVE-2026-106582)

It was discovered that OpenSSH's ssh client incorrectly allowed special characters in command-line usernames. An attacker could possibly use this issue to inject arbitrary commands via specially crafted usernames. (CVE-2026-106583)

It was discovered that OpenSSH's ssh-keygen incorrectly handled Daylight Saving Time when converting dates. An attacker could possibly use this issue to cause certificates to have incorrect expiration times. (CVE-2026-106584)

It was discovered that OpenSSH did not check whether the maximum packet length was exceeded during decompression. A remote attacker could possibly use this issue to cause a denial of service. (CVE-2026-106585)

It was discovered that OpenSSH's sshd server incorrectly applied the restrict keyword from authorized_keys to tunnel forwarding requests. A local attacker with an authorized key could possibly use this issue to bypass intended tunnel forwarding restrictions. (CVE-2026-106586)

It was discovered that OpenSSH's sshd server incorrectly handled certain configuration options that accept a "none" value. An attacker could possibly use this issue to cause OpenSSH to behave unexpectedly. (CVE-2026-106587)

Affected QuantaStor releases

ReleasePlatformPackageExposureShipped versionFixed versionStatus
6.9.1.001Ubuntu 22.04 LTSopenssh-clientInternally-facing1:8.9p1-3ubuntu0.181:8.9p1-3ubuntu0.18Fixed in this release
6.9.1.001Ubuntu 22.04 LTSopenssh-serverExternally-facing1:8.9p1-3ubuntu0.181:8.9p1-3ubuntu0.18Fixed in this release
6.9.1.001Ubuntu 22.04 LTSopenssh-sftp-serverInternally-facing1:8.9p1-3ubuntu0.181:8.9p1-3ubuntu0.18Fixed in this release
6.9.0.464Ubuntu 22.04 LTSopenssh-clientInternally-facing1:8.9p1-3ubuntu0.181:8.9p1-3ubuntu0.18Fixed in this release
6.9.0.464Ubuntu 22.04 LTSopenssh-serverExternally-facing1:8.9p1-3ubuntu0.181:8.9p1-3ubuntu0.18Fixed in this release
6.9.0.464Ubuntu 22.04 LTSopenssh-sftp-serverInternally-facing1:8.9p1-3ubuntu0.181:8.9p1-3ubuntu0.18Fixed in this release
6.8.6.015Ubuntu 22.04 LTSopenssh-clientInternally-facing1:8.9p1-3ubuntu0.171:8.9p1-3ubuntu0.18Fixed by QuantaStor security update
6.8.6.015Ubuntu 22.04 LTSopenssh-serverExternally-facing1:8.9p1-3ubuntu0.171:8.9p1-3ubuntu0.18Fixed by QuantaStor security update
6.8.6.015Ubuntu 22.04 LTSopenssh-sftp-serverInternally-facing1:8.9p1-3ubuntu0.171:8.9p1-3ubuntu0.18Fixed by QuantaStor security update
6.8.5.018Ubuntu 22.04 LTSopenssh-clientInternally-facing1:8.9p1-3ubuntu0.161:8.9p1-3ubuntu0.18Fixed by QuantaStor security update
6.8.5.018Ubuntu 22.04 LTSopenssh-serverExternally-facing1:8.9p1-3ubuntu0.161:8.9p1-3ubuntu0.18Fixed by QuantaStor security update
6.8.5.018Ubuntu 22.04 LTSopenssh-sftp-serverInternally-facing1:8.9p1-3ubuntu0.161:8.9p1-3ubuntu0.18Fixed by QuantaStor security update
6.8.4.038Ubuntu 22.04 LTSopenssh-clientInternally-facing1:8.9p1-3ubuntu0.161:8.9p1-3ubuntu0.18Fixed by QuantaStor security update
6.8.4.038Ubuntu 22.04 LTSopenssh-serverExternally-facing1:8.9p1-3ubuntu0.161:8.9p1-3ubuntu0.18Fixed by QuantaStor security update
6.8.4.038Ubuntu 22.04 LTSopenssh-sftp-serverInternally-facing1:8.9p1-3ubuntu0.161:8.9p1-3ubuntu0.18Fixed by QuantaStor security update
6.8.3.018Ubuntu 22.04 LTSopenssh-clientInternally-facing1:8.9p1-3ubuntu0.161:8.9p1-3ubuntu0.18Fixed by QuantaStor security update
6.8.3.018Ubuntu 22.04 LTSopenssh-serverExternally-facing1:8.9p1-3ubuntu0.161:8.9p1-3ubuntu0.18Fixed by QuantaStor security update
6.8.3.018Ubuntu 22.04 LTSopenssh-sftp-serverInternally-facing1:8.9p1-3ubuntu0.161:8.9p1-3ubuntu0.18Fixed by QuantaStor security update
6.8.2.002Ubuntu 22.04 LTSopenssh-clientInternally-facing1:8.9p1-3ubuntu0.161:8.9p1-3ubuntu0.18Fixed by QuantaStor security update
6.8.2.002Ubuntu 22.04 LTSopenssh-serverExternally-facing1:8.9p1-3ubuntu0.161:8.9p1-3ubuntu0.18Fixed by QuantaStor security update
6.8.2.002Ubuntu 22.04 LTSopenssh-sftp-serverInternally-facing1:8.9p1-3ubuntu0.161:8.9p1-3ubuntu0.18Fixed by QuantaStor security update
6.8.1.007Ubuntu 22.04 LTSopenssh-clientInternally-facing1:8.9p1-3ubuntu0.161:8.9p1-3ubuntu0.18Fixed by QuantaStor security update
6.8.1.007Ubuntu 22.04 LTSopenssh-serverExternally-facing1:8.9p1-3ubuntu0.161:8.9p1-3ubuntu0.18Fixed by QuantaStor security update
6.8.1.007Ubuntu 22.04 LTSopenssh-sftp-serverInternally-facing1:8.9p1-3ubuntu0.161:8.9p1-3ubuntu0.18Fixed by QuantaStor security update
6.8.0.205Ubuntu 22.04 LTSopenssh-clientInternally-facing1:8.9p1-3ubuntu0.151:8.9p1-3ubuntu0.18Fixed by QuantaStor security update
6.8.0.205Ubuntu 22.04 LTSopenssh-serverExternally-facing1:8.9p1-3ubuntu0.151:8.9p1-3ubuntu0.18Fixed by QuantaStor security update
6.8.0.205Ubuntu 22.04 LTSopenssh-sftp-serverInternally-facing1:8.9p1-3ubuntu0.151:8.9p1-3ubuntu0.18Fixed by QuantaStor security update

Internally-facing: only accessible when logged into the QuantaStor console/ssh as the qadmin administrative sudo user; generally lower priority. Externally-facing: part of a service the storage platform presents on the network (or the kernel), so potentially reachable over the network.

CVEs

CVE-2026-106552, CVE-2026-106553, CVE-2026-106585, CVE-2026-106583, CVE-2026-106584, CVE-2026-106586, CVE-2026-106587, CVE-2026-106555, CVE-2026-106582

References

https://ubuntu.com/security/notices/USN-8928-1

https://nvd.nist.gov/vuln/detail/CVE-2026-106552

https://nvd.nist.gov/vuln/detail/CVE-2026-106553

https://nvd.nist.gov/vuln/detail/CVE-2026-106585

https://nvd.nist.gov/vuln/detail/CVE-2026-106583

https://nvd.nist.gov/vuln/detail/CVE-2026-106584

https://nvd.nist.gov/vuln/detail/CVE-2026-106586

https://nvd.nist.gov/vuln/detail/CVE-2026-106587

https://nvd.nist.gov/vuln/detail/CVE-2026-106555

https://nvd.nist.gov/vuln/detail/CVE-2026-106582

Update

Fixes marked Fixed by QuantaStor security update are applied by upgrading QuantaStor with security patches included (Upgrade Manager). Fixed package versions:

PlatformPackageVersion
Ubuntu 22.04 LTSopenssh1:8.9p1-3ubuntu0.18
Ubuntu 24.04 LTSopenssh1:9.6p1-3ubuntu13.20
resoluteopenssh1:10.2p1-2ubuntu3.8