UBUNTU-CVE-2021-28906

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Source
https://ubuntu.com/security/CVE-2021-28906
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-28906.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2021-28906
Upstream
Published
2021-05-20T19:15:00Z
Modified
2025-10-24T04:50:15Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - low
Summary
[none]
Details

In function readyinleaf() in libyang <= v1.0.225, it doesn't check whether the value of retval->ext[r] is NULL. In some cases, it can be NULL, which leads to the operation of retval->ext[r]->flags that results in a crash.

References

Affected packages

Ubuntu:20.04:LTS / libyang

Package

Name
libyang
Purl
pkg:deb/ubuntu/libyang@0.16.105-3build1?arch=source&distro=focal

Affected ranges

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

Affected versions

0.*

0.16.105-1
0.16.105-2
0.16.105-3
0.16.105-3build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "0.16.105-3build1",
            "binary_name": "libyang-cpp-dev"
        },
        {
            "binary_version": "0.16.105-3build1",
            "binary_name": "libyang-cpp0.16"
        },
        {
            "binary_version": "0.16.105-3build1",
            "binary_name": "libyang-dev"
        },
        {
            "binary_version": "0.16.105-3build1",
            "binary_name": "libyang0.16"
        },
        {
            "binary_version": "0.16.105-3build1",
            "binary_name": "python3-yang"
        },
        {
            "binary_version": "0.16.105-3build1",
            "binary_name": "yang-tools"
        }
    ]
}

Ubuntu:22.04:LTS / libyang

Package

Name
libyang
Purl
pkg:deb/ubuntu/libyang@1.0.225-1.1?arch=source&distro=jammy

Affected ranges

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

Affected versions

1.*

1.0.225-1.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1.0.225-1.1",
            "binary_name": "libyang-cpp-dev"
        },
        {
            "binary_version": "1.0.225-1.1",
            "binary_name": "libyang-cpp1"
        },
        {
            "binary_version": "1.0.225-1.1",
            "binary_name": "libyang-dev"
        },
        {
            "binary_version": "1.0.225-1.1",
            "binary_name": "libyang-tools"
        },
        {
            "binary_version": "1.0.225-1.1",
            "binary_name": "libyang1"
        },
        {
            "binary_version": "1.0.225-1.1",
            "binary_name": "yang-tools"
        }
    ]
}