Glibc: potential use-after-free in getaddrinfo()
Summary
| CVE | CVE-2023-4806 |
|---|---|
| State | PUBLISHED |
| Assigner | redhat |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2023-09-18 17:15:55 UTC |
| Updated | 2026-05-12 11:16:15 UTC |
| Description | A flaw has been identified in glibc. In an extremely rare situation, the getaddrinfo function may access memory that has been freed, resulting in an application crash. This issue is only exploitable when a NSS module implements only the _nss_*_gethostbyname2_r and _nss_*_getcanonname_r hooks without implementing the _nss_*_gethostbyname3_r hook. The resolved name should return a large number of IPv6 and IPv4, and the call to the getaddrinfo function should have the AF_INET6 address family with AI_CANONNAME, AI_ALL and AI_V4MAPPED as flags. |
Risk And Classification
Primary CVSS: v3.1 5.9 MEDIUM from [email protected]
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS: 0.018950000 probability, percentile 0.833660000 (date 2026-05-12)
Problem Types: CWE-416 | CWE-416 Use After Free
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Primary | 5.9 | MEDIUM | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H |
| 3.1 | [email protected] | Secondary | 5.9 | MEDIUM | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H |
| 3.1 | CNA | CVSS | 5.9 | MEDIUM | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
HighPrivileges Required
NoneUser Interaction
NoneScope
UnchangedConfidentiality
NoneIntegrity
NoneAvailability
HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Operating System | Fedoraproject | Fedora | 37 | All | All | All |
| Operating System | Fedoraproject | Fedora | 38 | All | All | All |
| Operating System | Fedoraproject | Fedora | 39 | All | All | All |
| Application | Gnu | Glibc | 2.33 | All | All | All |
| Application | Redhat | Codeready Linux Builder Eus | 9.2 | All | All | All |
| Application | Redhat | Codeready Linux Builder Eus For Power Little Endian | 9.0_ppc64le | All | All | All |
| Application | Redhat | Codeready Linux Builder Eus For Power Little Endian Eus | 9.2_ppc64le | All | All | All |
| Application | Redhat | Codeready Linux Builder For Arm64 | 9.0_aarch64 | All | All | All |
| Application | Redhat | Codeready Linux Builder For Arm64 Eus | 9.2_aarch64 | All | All | All |
| Application | Redhat | Codeready Linux Builder For Ibm Z Systems | 9.0_s390x | All | All | All |
| Application | Redhat | Codeready Linux Builder For Ibm Z Systems Eus | 9.2_s390x | All | All | All |
| Operating System | Redhat | Enterprise Linux | 7.0 | All | All | All |
| Operating System | Redhat | Enterprise Linux | 8.0 | All | All | All |
| Operating System | Redhat | Enterprise Linux | 9.0 | All | All | All |
| Operating System | Redhat | Enterprise Linux Eus | 8.8 | All | All | All |
| Operating System | Redhat | Enterprise Linux Eus | 9.2 | All | All | All |
| Operating System | Redhat | Enterprise Linux For Arm 64 | 9.0_aarch64 | All | All | All |
| Operating System | Redhat | Enterprise Linux For Arm 64 Eus | 9.2_aarch64 | All | All | All |
| Operating System | Redhat | Enterprise Linux For Ibm Z Systems | 8.0_s390x | All | All | All |
| Operating System | Redhat | Enterprise Linux For Ibm Z Systems Eus | 8.8_s390x | All | All | All |
| Operating System | Redhat | Enterprise Linux For Ibm Z Systems Eus S390x | 9.2 | All | All | All |
| Operating System | Redhat | Enterprise Linux For Ibm Z Systems S390x | 9.2 | All | All | All |
| Operating System | Redhat | Enterprise Linux For Power Little Endian | 8.0_ppc64le | All | All | All |
| Operating System | Redhat | Enterprise Linux For Power Little Endian | 9.2_ppc64le | All | All | All |
| Operating System | Redhat | Enterprise Linux For Power Little Endian Eus | 8.8_ppc64le | All | All | All |
| Operating System | Redhat | Enterprise Linux For Power Little Endian Eus | 9.2_ppc64le | All | All | All |
| Operating System | Redhat | Enterprise Linux Server Aus | 9.2 | All | All | All |
| Operating System | Redhat | Enterprise Linux Server For Power Little Endian Update Services For Sap Solutions | 9.2_ppc64le | All | All | All |
| Operating System | Redhat | Enterprise Linux Tus | 8.8 | All | All | All |
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Red Hat | Red Hat Enterprise Linux 8 | unaffected 0:2.28-225.el8_8.6 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 8 | unaffected 0:2.28-225.el8_8.6 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 8.6 Extended Update Support | unaffected 0:2.28-189.8.el8_6 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 9 | unaffected 0:2.34-100.el9 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 9 | unaffected 0:2.34-60.el9_2.7 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 9 | unaffected 0:2.34-100.el9 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 9 | unaffected 0:2.34-60.el9_2.7 * rpm | Not specified |
| CNA | Red Hat | Red Hat Virtualization 4 For Red Hat Enterprise Linux 8 | unaffected 0:2.28-189.8.el8_6 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 6 | Not specified | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 6 | Not specified | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 7 | Not specified | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 7 | Not specified | Not specified |
| ADP | Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP | affected V3.1.5 * custom | Not specified |
| ADP | Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP | affected V3.1.5 * custom | Not specified |
| ADP | Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP | affected V3.1.5 * custom | Not specified |
| ADP | Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP | affected V3.1.5 * custom | Not specified |
| ADP | Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP | affected V3.1.5 * custom | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| CVE-2023-4806 GNU C Library (glibc) Vulnerability in NetApp Products | NetApp Product Security | af854a3a-2127-422b-91ae-364da2661108 | security.netapp.com | |
| Red Hat | af854a3a-2127-422b-91ae-364da2661108 | access.redhat.com | Third Party Advisory |
| Red Hat | af854a3a-2127-422b-91ae-364da2661108 | access.redhat.com | Third Party Advisory |
| cert-portal.siemens.com/productcert/html/ssa-082556.html | 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e | cert-portal.siemens.com | |
| oss-security - Re: CVE-2023-4806, CVE-2023-5156: glibc: potential use-after-free in getaddrinfo() | af854a3a-2127-422b-91ae-364da2661108 | www.openwall.com | |
| glibc: Multiple vulnerabilities (GLSA 202310-03) — Gentoo security | af854a3a-2127-422b-91ae-364da2661108 | security.gentoo.org | |
| 2237782 – (CVE-2023-4806) CVE-2023-4806 glibc: potential use-after-free in getaddrinfo() | af854a3a-2127-422b-91ae-364da2661108 | bugzilla.redhat.com | Issue Tracking, Third Party Advisory |
| [SECURITY] Fedora 38 Update: glibc-2.37-10.fc38 - package-announce - Fedora Mailing-Lists | af854a3a-2127-422b-91ae-364da2661108 | lists.fedoraproject.org | |
| cert-portal.siemens.com/productcert/html/ssa-831302.html | 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e | cert-portal.siemens.com | |
| Red Hat | af854a3a-2127-422b-91ae-364da2661108 | access.redhat.com | |
| [SECURITY] Fedora 39 Update: glibc-2.38-6.fc39 - package-announce - Fedora Mailing-Lists | af854a3a-2127-422b-91ae-364da2661108 | lists.fedoraproject.org | |
| cve-details | af854a3a-2127-422b-91ae-364da2661108 | access.redhat.com | Third Party Advisory |
| oss-security - Re: CVE-2023-4806, CVE-2023-5156: glibc: potential use-after-free in getaddrinfo() | af854a3a-2127-422b-91ae-364da2661108 | www.openwall.com | |
| access.redhat.com/errata/RHBA-2024:2413 | [email protected] | access.redhat.com | |
| [SECURITY] Fedora 37 Update: glibc-2.36-14.fc37 - package-announce - Fedora Mailing-Lists | af854a3a-2127-422b-91ae-364da2661108 | lists.fedoraproject.org | |
| oss-security - CVE-2023-4806, CVE-2023-5156: glibc: potential use-after-free in getaddrinfo() | af854a3a-2127-422b-91ae-364da2661108 | www.openwall.com | |
| oss-security - Re: CVE-2023-4806, CVE-2023-5156: glibc: potential use-after-free in getaddrinfo() | af854a3a-2127-422b-91ae-364da2661108 | www.openwall.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: This issue was discovered by Siddhesh Poyarekar (Red Hat). (en)
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| CNA | 2023-09-06T00:00:00.000Z | Reported to Red Hat. |
| CNA | 2023-09-12T00:00:00.000Z | Made public. |
Legacy QID Mappings
- 160965 Oracle Enterprise Linux Security Update for glibc (ELSA-2023-5455)
- 160968 Oracle Enterprise Linux Security Update for glibc (ELSA-2023-5453)
- 160973 Oracle Enterprise Linux Security Update for glibc (ELSA-2023-12872)
- 160974 Oracle Enterprise Linux Security Update for glibc (ELSA-2023-12873)
- 199987 Ubuntu Security Notification for GNU C Library Vulnerabilities (USN-6541-1)
- 242111 Red Hat Update for glibc (RHSA-2023:5453)
- 242118 Red Hat Update for glibc (RHSA-2023:5455)
- 242490 Red Hat Update for glibc (RHSA-2023:7409)
- 284570 Fedora Security Update for glibc (FEDORA-2023-2b8c11ee75)
- 284571 Fedora Security Update for glibc (FEDORA-2023-028062484e)
- 285226 Fedora Security Update for glibc (FEDORA-2023-63e5a77522)
- 356310 Amazon Linux Security Advisory for glibc : ALAS2023-2023-359
- 378929 Alibaba Cloud Linux Security Update for glibc (ALINUX3-SA-2023:0124)
- 6000014 Debian Security Update for glibc (DSA 5514-1)
- 6140090 AWS Bottlerocket Security Update for glibc (GHSA-m6r6-qxq3-mcgr)
- 673448 EulerOS Security Update for glibc (EulerOS-SA-2024-1268)
- 673505 EulerOS Security Update for glibc (EulerOS-SA-2023-3269)
- 673617 EulerOS Security Update for glibc (EulerOS-SA-2023-3241)
- 673645 EulerOS Security Update for glibc (EulerOS-SA-2023-3330)
- 673703 EulerOS Security Update for glibc (EulerOS-SA-2023-3298)
- 673859 EulerOS Security Update for glibc (EulerOS-SA-2024-1057)
- 674073 EulerOS Security Update for glibc (EulerOS-SA-2024-1081)
- 710764 Gentoo Linux glibc Multiple Vulnerabilities (GLSA 202310-03)
- 907528 Common Base Linux Mariner (CBL-Mariner) Security Update for glibc (29954-1)
- 941278 AlmaLinux Security Update for glibc (ALSA-2023:5455)
- 941283 AlmaLinux Security Update for glibc (ALSA-2023:5453)
- 961035 Rocky Linux Security Update for glibc (RLSA-2023:5455)