CVE-2026-101276

Public on 2026-09-30

Modified on 2026-10-03

Description

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

Severity

Important

See what this means

CVSS v3 Base Score

8.1

See breakdown

Affected Packages

Platform	Package	Status
Amazon Linux 2 - Testing Extra	iperf	Not Affected
Amazon Linux 2023	iperf	Not Affected
Amazon Linux 2027 Preview	iperf	Not Affected
Amazon Linux 2 - Core	iperf3	Not Affected
Amazon Linux 2023	iperf3	Not Affected
Amazon Linux 2027 Preview	iperf3	Pending Fix

CVSS Scores

	Score Type	Score	Vector
Amazon Linux	CVSSv3	8.1	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

References

FAQs regarding Amazon Linux ALAS/CVE Severity Red Hat: CVE-2026-101276 Mitre: CVE-2026-101276