Bug 2530770 - CVE-2026-78662 opkssh: golang.org/x/crypto/ssh: Denial of Service via channel request flooding [fedora-all]
Summary: CVE-2026-78662 opkssh: golang.org/x/crypto/ssh: Denial of Service via channel...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Fedora
Classification: Fedora
Component: opkssh
Version: rawhide
Hardware: Unspecified
OS: Unspecified
medium
medium
Target Milestone: ---
Assignee: Till Hofmann
QA Contact:
URL:
Whiteboard: {"flaws": ["e558e301-1905-4049-a2bf-4...
Depends On:
Blocks: CVE-2026-78662
TreeView+ depends on / blocked
 
Reported: 2026-09-09 12:01 UTC by jkelly
Modified: 2026-09-21 01:04 UTC (History)
2 users (show)

Fixed In Version: opkssh-0.16.0-3.fc45 opkssh-0.16.0-3.fc44 opkssh-0.16.0-3.fc43
Clone Of:
Environment:
Last Closed: 2026-09-21 00:15:17 UTC
Type: ---
Embargoed:


Attachments (Terms of Use)

Description jkelly 2026-09-09 12:01:22 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 2026-09-12 08:52:33 UTC
FEDORA-2026-38b019a0f0 (opkssh-0.16.0-3.fc43) has been submitted as an update to Fedora 43.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-38b019a0f0

Comment 2 Fedora Update System 2026-09-12 08:52:42 UTC
FEDORA-2026-f7b73f165d (opkssh-0.16.0-3.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-f7b73f165d

Comment 3 Fedora Update System 2026-09-12 08:52:48 UTC
FEDORA-2026-559bbb39f5 (opkssh-0.16.0-3.fc45) has been submitted as an update to Fedora 45.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-559bbb39f5

Comment 4 Fedora Update System 2026-09-13 18:30:48 UTC
FEDORA-2026-f7b73f165d 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-f7b73f165d`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-f7b73f165d

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

Comment 5 Fedora Update System 2026-09-13 18:46:25 UTC
FEDORA-2026-559bbb39f5 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-2026-559bbb39f5`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-559bbb39f5

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

Comment 6 Fedora Update System 2026-09-13 19:13:29 UTC
FEDORA-2026-38b019a0f0 has been pushed to the Fedora 43 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-38b019a0f0`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-38b019a0f0

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

Comment 7 Fedora Update System 2026-09-21 00:15:17 UTC
FEDORA-2026-559bbb39f5 (opkssh-0.16.0-3.fc45) has been pushed to the Fedora 45 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 8 Fedora Update System 2026-09-21 00:52:00 UTC
FEDORA-2026-f7b73f165d (opkssh-0.16.0-3.fc44) has been pushed to the Fedora 44 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 9 Fedora Update System 2026-09-21 01:04:27 UTC
FEDORA-2026-38b019a0f0 (opkssh-0.16.0-3.fc43) has been pushed to the Fedora 43 stable repository.
If problem still persists, please make note of it in this bug report.


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