Bug 2553038 (CVE-2026-110928)

Summary: CVE-2026-110928 openssh: openssh: authorized_keys restrict does not apply to tunnel forwarding
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: akhatavk, aos-team-art-private, asdas, dpaolell, jdelft, jupierce, lgarciaa, mbiarnes, ppalepu, ppostler, prdhamdh, rhel-process-autobot, sghai, sidsharm, suppawar, vlaad, watson-tool-maintainers, yguenane
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in OpenSSH. The authorized_keys "restrict" keyword was not applied to tunnel forwarding. When PermitTunnel is enabled, a restricted key can still open a tunnel.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-10-15 04:29:32 UTC
A flaw was found in OpenSSH sshd. The authorized_keys "restrict" keyword was not applied to tunnel forwarding. A key or certificate principal marked restrict could still open a tunnel when PermitTunnel was enabled. PermitTunnel is disabled by default. This is separate from the tunnel check added in OpenSSH 10.5 (CVE-2026-73283). The RHEL maintainer reported that the downstream patch openssh-10.4p1-CVE-2026-59999.patch is stricter than the upstream fix, so Red Hat Enterprise Linux is not affected. Reserve the CVE for upstream. Do not file RHEL trackers.