Bug 2530815

Summary:	CVE-2026-78662 nebula: golang.org/x/crypto/ssh: Denial of Service via channel request flooding [fedora-all]
Product:	[Fedora] Fedora	Reporter:	jkelly <jkelly>
Component:	nebula	Assignee:	Fabio Alessandro Locati <me>
Status:	ON_QA ---	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	rawhide	CC:	go-sig, joe, me, tjspugcr
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:		Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
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 12:15:51 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 Fedora Update System 2026-10-11 17:48:50 UTC

FEDORA-2026-1aa327b369 (nebula-1.11.2-1.fc45) has been submitted as an update to Fedora 45.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-1aa327b369

Comment 2 Fedora Update System 2026-10-11 17:48:53 UTC

FEDORA-2026-3dbdc5d71d (nebula-1.11.2-1.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-3dbdc5d71d

Comment 3 Fedora Update System 2026-10-13 01:58:38 UTC

FEDORA-2026-1aa327b369 has been pushed to the Fedora 45 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-1aa327b369`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-1aa327b369

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 4 Fedora Update System 2026-10-13 02:33:10 UTC

FEDORA-2026-3dbdc5d71d has been pushed to the Fedora 44 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-3dbdc5d71d`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-3dbdc5d71d

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.