Bug 2543638 (CVE-2026-102253) - CVE-2026-102253 iperf3: iperf3: Denial of Service via UDP receive worker infinite loop
Summary: CVE-2026-102253 iperf3: iperf3: Denial of Service via UDP receive worker infi...
Keywords:
Status: NEW
Alias: CVE-2026-102253
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2544509
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-29 20:36 UTC by OSIDB Bzimport
Modified: 2026-10-01 10:36 UTC (History)
2 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-09-29 20:36:59 UTC 
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.
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