Amazon Linux 2027 Preview Security Advisory: ALAS2027-2026-224
Advisory Released Date: 2026-10-26
Advisory Updated Date: 2026-11-02
Severity:
Important
Issue Overview:
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 (CVE-2026-101276)
iperf3 3.20–3.21 (esnet/iperf) has a pre-auth heap buffer overflow in decrypt_rsa_message(): a 256-byte RSA buffer is BIO_read with the attacker-controlled ciphertext length (guard warns only), so an unauthenticated client overflows the heap via an oversized authtoken; (CVE-2026-101283)
Affected Packages:
iperf3
Issue Correction:
Run dnf update iperf3 --releasever 2027.0.20261026 or dnf update --advisory ALAS2027-2026-224 --releasever 2027.0.20261026 to update your system.
More information on how to update your system can be found on this page: Amazon Linux 2027 documentation
New Packages:
aarch64:
iperf3-debugsource-3.22-1.amzn2027.0.1.aarch64
iperf3-devel-3.22-1.amzn2027.0.1.aarch64
iperf3-debuginfo-3.22-1.amzn2027.0.1.aarch64
iperf3-3.22-1.amzn2027.0.1.aarch64
src:
iperf3-3.22-1.amzn2027.0.1.src
x86_64:
iperf3-debuginfo-3.22-1.amzn2027.0.1.x86_64
iperf3-3.22-1.amzn2027.0.1.x86_64
iperf3-debugsource-3.22-1.amzn2027.0.1.x86_64
iperf3-devel-3.22-1.amzn2027.0.1.x86_64