{"id":"UBUNTU-CVE-2026-101276","details":"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.","modified":"2026-10-02T22:30:11.352314781Z","published":"2026-10-02T00:00:00Z","upstream":["CVE-2026-101276"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-101276"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-101276"},{"type":"REPORT","url":"https://github.com/esnet/iperf/releases/tag/3.22"},{"type":"REPORT","url":"https://github.com/esnet/iperf/commit/9bea2d9a49d54870e2405c209fa60bf134a8a1a1"},{"type":"REPORT","url":"https://newreleases.io/project/github/esnet/iperf/release/3.22"}],"affected":[{"package":{"name":"iperf3","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/iperf3?arch=source&distro=esm-apps%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.0.11-1","3.0.11-1ubuntu0.1~esm1","3.0.11-1ubuntu0.1~esm2"],"ecosystem_specific":{"binaries":[{"binary_name":"iperf3","binary_version":"3.0.11-1ubuntu0.1~esm2"},{"binary_name":"libiperf0","binary_version":"3.0.11-1ubuntu0.1~esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-101276.json"}},{"package":{"name":"iperf3","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/iperf3?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.1.3-1","3.1.3-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"iperf3","binary_version":"3.1.3-1ubuntu0.1~esm1"},{"binary_name":"libiperf0","binary_version":"3.1.3-1ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-101276.json"}},{"package":{"name":"iperf3","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/iperf3?arch=source&distro=esm-apps%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.6-2","3.7-1","3.7-2","3.7-3","3.7-3ubuntu0.1~esm1","3.7-3ubuntu0.1~esm2"],"ecosystem_specific":{"binaries":[{"binary_version":"3.7-3ubuntu0.1~esm2","binary_name":"iperf3"},{"binary_version":"3.7-3ubuntu0.1~esm2","binary_name":"libiperf0"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-101276.json"}},{"package":{"name":"iperf3","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/iperf3?arch=source&distro=esm-apps%2Fjammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.9-1","3.9-1build1","3.9-1+deb11u1build0.22.04.1","3.9-1+deb11u1ubuntu0.1~esm1","3.9-1+deb11u1ubuntu0.1"],"ecosystem_specific":{"binaries":[{"binary_version":"3.9-1+deb11u1ubuntu0.1","binary_name":"iperf3"},{"binary_name":"libiperf0","binary_version":"3.9-1+deb11u1ubuntu0.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-101276.json"}},{"package":{"name":"iperf3","ecosystem":"Ubuntu:Pro:24.04:LTS","purl":"pkg:deb/ubuntu/iperf3?arch=source&distro=esm-apps%2Fnoble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.14-1","3.15-1","3.16-1","3.16-1build1","3.16-1build2","3.16-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"iperf3","binary_version":"3.16-1ubuntu0.1~esm1"},{"binary_name":"libiperf0","binary_version":"3.16-1ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-101276.json"}},{"package":{"name":"iperf3","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/iperf3?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.18-2","3.19.1-2","3.20-2"],"ecosystem_specific":{"binaries":[{"binary_version":"3.20-2","binary_name":"iperf3"},{"binary_name":"libiperf0","binary_version":"3.20-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-101276.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"},{"type":"Ubuntu","score":"medium"}]}