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CVE-2023-4806

Glibc: potential use-after-free in getaddrinfo()

Published: Sep 18, 2023Updated: May 12, 2026 Sources: CVE List NVD BDU csafCWE-416
NVD MITRE
5.9CVSSMEDIUM
EPSS Score
1.4%
Top 30.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:HPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-416

Affected Products

glibcgnuOSS Libraries
codeready linux builder eusredhat
On-premOS
Operating Systems / linux-distro
codeready linux builder eus for power little endianredhat
On-prem
Operating Systems / linux-distro
codeready linux builder eus for power little endian eusredhat
On-prem
Operating Systems / linux-distro
codeready linux builder for arm64redhat
On-prem
Operating Systems / linux-distro
gnuoss-projectUSOSS Librariesaka g. nu
redhatcommercialUSOperating Systemsaka red hat
and 74 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Initial Access
Privilege Escalation
View detailed technique mapping

References

https://access.redhat.com/errata/RHBA-2024:2413
access.redhat.com
https://access.redhat.com/errata/RHSA-2023:5453
access.redhat.com
https://access.redhat.com/errata/RHSA-2023:5455
access.redhat.com
and 270 more references View all →

Timeline

Published
Sep 18, 2023
Last Updated
May 12, 2026

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