iperf3 3.21 (esnet/iperf) contains a remote, unauthenticated heap use-after-free: the server's per-test watchdog server_timer_proc() frees streams without cancelling/joining their worker threads, so a blocked worker dereferences a freed iperf_stream; fixed in 3.22.
CVE-2026-101276 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-101276, released October 5, 2026. It is not reported as exploited. Patch Radar priority: Urgent.
iperf3 3.21 (esnet/iperf) contains a remote, unauthenticated heap use-after-free: the server's per-test watchdog server_timer_proc() frees streams without cancelling/joining their worker threads, so a blocked worker dereferences a freed iperf_stream; fixed in 3.22.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| iperf · opensuse-leap 16.0 | 3.21-160000.1.1 | OPENSUSE-SU-2026:22090-1 | Nov 7, 2026 |
| iperf · sles 15.7 | 3.22-150000.3.18.1 | SUSE-SU-2026:4678-1 | Nov 7, 2026 |
| iperf · sles 16.0 | 3.21-160000.1.1 | SUSE-SU-2026:24234-1 | Nov 7, 2026 |
| iperf3 · Debian 14 | 3.22-0.1 | DEBIAN-CVE-2026-101276 | Oct 5, 2026 |
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