Bug 2544509

Summary: CVE-2026-102253 iperf3: iperf3: Denial of Service via UDP receive worker infinite loop [fedora-all]
Product: [Fedora] Fedora Reporter: Samuele Negrini <snegrini>
Component: iperf3Assignee: Jonathan Wright <jonathan>
Status: CLOSED ERRATA QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: high Docs Contact:
Priority: high    
Version: rawhideCC: anon.amish, balajig81, fhrdina, jonathan, kevin, sven
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["c4f63444-bb54-4e94-a300-1b515162580d"]}
Fixed In Version: iperf3-3.22-1.fc44 iperf3-3.22-2.fc43 Doc Type: ---
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2026-10-13 01:09:23 UTC 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: 2543638    

Description Samuele Negrini 2026-10-01 10:36:42 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.

iperf3 versions prior to 3.22 contains a denial of service vulnerability that allows unauthenticated remote attackers to crash-loop the server's UDP receive worker into an unrecoverable infinite loop by sending a single crafted control-channel parameter message followed by one 16-byte UDP datagram. Attackers can permanently pin the affected per-stream receive thread at approximately 100% CPU usage, rendering the server unusable until forcibly killed with SIGKILL, as the process does not respond to normal control-channel closure.

Comment 1 Fedora Update System 2026-10-04 17:47:39 UTC
FEDORA-2026-72fe3625a6 (iperf3-3.22-1.fc45) has been submitted as an update to Fedora 45.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-72fe3625a6

Comment 2 Fedora Update System 2026-10-04 18:47:49 UTC
FEDORA-2026-c6bdc4b415 (iperf3-3.22-1.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-c6bdc4b415

Comment 3 Fedora Update System 2026-10-04 20:20:20 UTC
FEDORA-2026-af72c5c990 (iperf3-3.22-2.fc43) has been submitted as an update to Fedora 43.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-af72c5c990

Comment 4 Fedora Update System 2026-10-05 01:54:45 UTC
FEDORA-2026-72fe3625a6 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-2026-72fe3625a6`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-72fe3625a6

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

Comment 5 Fedora Update System 2026-10-05 02:17:24 UTC
FEDORA-2026-c6bdc4b415 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-c6bdc4b415`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-c6bdc4b415

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

Comment 6 Fedora Update System 2026-10-05 02:47:09 UTC
FEDORA-2026-af72c5c990 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-af72c5c990`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-af72c5c990

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

Comment 7 Fedora Update System 2026-10-13 01:09:23 UTC
FEDORA-2026-c6bdc4b415 (iperf3-3.22-1.fc44) has been pushed to the Fedora 44 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 8 Fedora Update System 2026-10-13 01:40:25 UTC
FEDORA-2026-af72c5c990 (iperf3-3.22-2.fc43) has been pushed to the Fedora 43 stable repository.
If problem still persists, please make note of it in this bug report.