UBUNTU-CVE-2026-101276

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Source
https://ubuntu.com/security/CVE-2026-101276
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-101276.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-101276
Upstream
  • CVE-2026-101276
Published
2026-10-02T00:00:00Z
Modified
2026-10-02T22:30:11Z
Severity
  • 9.2 (Critical) CVSS_V4 - 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 CVSS Calculator
  • 9.2 (Critical) CVSS_V4 - 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 CVSS Calculator
  • Ubuntu - medium
Summary
[none]
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.

References

Affected packages

Ubuntu:26.04:LTS
iperf3

Package

Name
iperf3
Purl
pkg:deb/ubuntu/iperf3?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

3.*
3.18-2
3.19.1-2
3.20-2

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "iperf3",
            "binary_version":  "3.20-2"
        },
        {
            "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"
Ubuntu:Pro:16.04:LTS
iperf3

Package

Name
iperf3
Purl
pkg:deb/ubuntu/iperf3?arch=source&distro=esm-apps%2Fxenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

3.*
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"
Ubuntu:Pro:18.04:LTS
iperf3

Package

Name
iperf3
Purl
pkg:deb/ubuntu/iperf3?arch=source&distro=esm-apps%2Fbionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

3.*
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"
Ubuntu:Pro:20.04:LTS
iperf3

Package

Name
iperf3
Purl
pkg:deb/ubuntu/iperf3?arch=source&distro=esm-apps%2Ffocal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

3.*
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_name":  "iperf3",
            "binary_version":  "3.7-3ubuntu0.1~esm2"
        },
        {
            "binary_name":  "libiperf0",
            "binary_version":  "3.7-3ubuntu0.1~esm2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-101276.json"
Ubuntu:Pro:22.04:LTS
iperf3

Package

Name
iperf3
Purl
pkg:deb/ubuntu/iperf3?arch=source&distro=esm-apps%2Fjammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

3.*
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_name":  "iperf3",
            "binary_version":  "3.9-1+deb11u1ubuntu0.1"
        },
        {
            "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"
Ubuntu:Pro:24.04:LTS
iperf3

Package

Name
iperf3
Purl
pkg:deb/ubuntu/iperf3?arch=source&distro=esm-apps%2Fnoble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

3.*
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"