UBUNTU-CVE-2021-27645

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Source
https://ubuntu.com/security/CVE-2021-27645
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-27645.json
JSON Data
https://api.test.osv.dev/v1/vulns/UBUNTU-CVE-2021-27645
Upstream
Downstream
Related
Published
2021-02-24T15:15:00Z
Modified
2025-09-08T16:47:02Z
Severity
  • 2.5 (Low) CVSS_V3 - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
  • 2.5 (Low) CVSS_V3 - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
  • Ubuntu - low
Summary
[none]
Details

The nameserver caching daemon (nscd) in the GNU C Library (aka glibc or libc6) 2.29 through 2.33, when processing a request for netgroup lookup, may crash due to a double-free, potentially resulting in degraded service or Denial of Service on the local system. This is related to netgroupcache.c.

References

Affected packages

Ubuntu:20.04:LTS / glibc

Package

Name
glibc
Purl
pkg:deb/ubuntu/glibc@2.31-0ubuntu9.7?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.31-0ubuntu9.7

Affected versions

2.*

2.30-0ubuntu2
2.30-0ubuntu3
2.31-0ubuntu5
2.31-0ubuntu6
2.31-0ubuntu7
2.31-0ubuntu9
2.31-0ubuntu9.1
2.31-0ubuntu9.2
2.31-0ubuntu9.3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.31-0ubuntu9.7",
            "binary_name": "glibc-source"
        },
        {
            "binary_version": "2.31-0ubuntu9.7",
            "binary_name": "libc-bin"
        },
        {
            "binary_version": "2.31-0ubuntu9.7",
            "binary_name": "libc-dev-bin"
        },
        {
            "binary_version": "2.31-0ubuntu9.7",
            "binary_name": "libc6"
        },
        {
            "binary_version": "2.31-0ubuntu9.7",
            "binary_name": "libc6-amd64"
        },
        {
            "binary_version": "2.31-0ubuntu9.7",
            "binary_name": "libc6-armel"
        },
        {
            "binary_version": "2.31-0ubuntu9.7",
            "binary_name": "libc6-dev"
        },
        {
            "binary_version": "2.31-0ubuntu9.7",
            "binary_name": "libc6-dev-amd64"
        },
        {
            "binary_version": "2.31-0ubuntu9.7",
            "binary_name": "libc6-dev-armel"
        },
        {
            "binary_version": "2.31-0ubuntu9.7",
            "binary_name": "libc6-dev-i386"
        },
        {
            "binary_version": "2.31-0ubuntu9.7",
            "binary_name": "libc6-dev-s390"
        },
        {
            "binary_version": "2.31-0ubuntu9.7",
            "binary_name": "libc6-dev-x32"
        },
        {
            "binary_version": "2.31-0ubuntu9.7",
            "binary_name": "libc6-i386"
        },
        {
            "binary_version": "2.31-0ubuntu9.7",
            "binary_name": "libc6-lse"
        },
        {
            "binary_version": "2.31-0ubuntu9.7",
            "binary_name": "libc6-pic"
        },
        {
            "binary_version": "2.31-0ubuntu9.7",
            "binary_name": "libc6-prof"
        },
        {
            "binary_version": "2.31-0ubuntu9.7",
            "binary_name": "libc6-s390"
        },
        {
            "binary_version": "2.31-0ubuntu9.7",
            "binary_name": "libc6-x32"
        },
        {
            "binary_version": "2.31-0ubuntu9.7",
            "binary_name": "locales"
        },
        {
            "binary_version": "2.31-0ubuntu9.7",
            "binary_name": "locales-all"
        },
        {
            "binary_version": "2.31-0ubuntu9.7",
            "binary_name": "nscd"
        }
    ],
    "availability": "No subscription required"
}