Bug 2530703

Summary: CVE-2026-78662 cri-o1.34: golang.org/x/crypto/ssh: Denial of Service via channel request flooding [fedora-all]
Product: [Fedora] Fedora Reporter: jkelly <jkelly>
Component: cri-o1.34Assignee: Brad Smith <bradley.g.smith>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: rawhideCC: bradley.g.smith, go-sig
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["e558e301-1905-4049-a2bf-4abd80cf6714"]}
Fixed In Version: Doc Type: ---
Doc Text:
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Clone Of: Environment:
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Documentation: --- CRM:
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 2528026    

Description jkelly 2026-09-09 10:40:10 UTC 
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

Previously, a channel registered in the mux's chanList is not usable until it is established. A malicious peer was able flood the channel's incomingRequests, deadlocking the entire connection. Now, we add an atomic established state, set when a channel becomes usable. Until such a time, handlePacket drops every packet other than the open confirmation/failure, without blocking and without tearing down the connection.
Comment 1 Brad Smith 2026-09-27 21:08:55 UTC 
v 1.34.14

    {
      "vulnerability": {
        "@id": "https://pkg.go.dev/vuln/GO-2026-6354",
        "name": "GO-2026-6354",
        "description": "Prevent DoS on deadlocked undecided channel in golang.org/x/crypto/ssh",
        "aliases": [
          "CVE-2026-78662"
        ]
      },
      "products": [
        {
          "@id": "Unknown Product",
          "subcomponents": [
            {
              "@id": "pkg:golang/golang.org%2Fx%2Fcrypto.0"
            }
          ]
        }
      ],
      "status": "affected"
    },