Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| esnet | iperf3 | 3.14 – < 3.22 | 3.22 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | iperf3 | 3.22-0.1 | — |
| Debian 13 | iperf3 | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | iperf3 | No fix yet | — |
| Ubuntu 26.04 LTS | iperf3 | No fix yet | — |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 24.04 LTS | iperf3 | No fix yet | — |
| Ubuntu Pro 22.04 LTS | iperf3 | No fix yet | — |
| Ubuntu Pro 20.04 LTS | iperf3 | No fix yet | — |
| Ubuntu Pro 18.04 LTS | iperf3 | No fix yet | — |
| Ubuntu Pro 16.04 LTS | iperf3 | No fix yet | — |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | iperf3 | 3.17.1-6.el10_2.2 | ALSA-2026:88207 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | iperf3 | 3.17.1-6.el10_2.2 | RLSA-2026:98085, RLSA-2026:88207 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | iperf | 3.22-150000.3.18.1 | SUSE-SU-2026:4678-1 |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | iperf | 3.21-160000.1.1 | SUSE-SU-2026:24234-1 |
| SLES 16.0 | iperf | 3.21-160000.1.1 | SUSE-SU-2026:24234-1 |
| SLE Micro 6.2 | iperf | 3.21-160000.1.1 | SUSE-SU-2026:24178-1 |
| SUSE Enterprise Storage 7.1 | iperf | 3.22-150000.3.18.1 | SUSE-SU-2026:4678-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | iperf | 3.22-1.1 | openSUSE-SU-2026:12060-1 |
| openSUSE Leap 16.0 | iperf | 3.21-160000.1.1 | openSUSE-SU-2026:22090-1 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | iperf3 | 3.17.1-7 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | iperf3 | 3.17.1-6.el10_2.2 | ELSA-2026-88207 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
GitHub 1 repository
-
Ravi-lk/CVE-2026-102253-POC ★ 0 · Oct 7, 2026
DOS infinite-loop Vulnerability POC
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 10
- RLSA-2026:98085 Important: iperf3 security update Rocky Linux Security Advisories · Nov 13, 2026
- WID-SEC-2026-4121 Red Hat Enterprise Linux iperf3: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Nov 10, 2026
- ALSA-2026:88207 Important: iperf3 security update AlmaLinux Security Advisories · Oct 29, 2026
- RLSA-2026:88207 Important: iperf3 security update Rocky Linux Security Advisories · Oct 23, 2026
- ELSA-2026-88207 Important: iperf3 security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Oct 22, 2026
- SUSE-SU-2026:24234-1 Security update for iperf SUSE / openSUSE Security Updates · Oct 21, 2026
- SUSE-SU-2026:24178-1 Security update for iperf SUSE / openSUSE Security Updates · Oct 20, 2026
- openSUSE-SU-2026:22090-1 Security update for iperf SUSE / openSUSE Security Updates · Oct 19, 2026
- SUSE-SU-2026:4678-1 Security update for iperf SUSE / openSUSE Security Updates · Oct 15, 2026
- openSUSE-SU-2026:12060-1 iperf-3.22-1.1 on GA media SUSE / openSUSE Security Updates · Oct 6, 2026
References
- iperf3 3.22 Release Notes vendor-advisory patch release-notes
- Vendor Release Notes release-notes
- VulnCheck Advisory third-party-advisory