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    CVE-2023-4806

    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.

    Published:Sep 12, 2023
    Last Modified:May 12, 2026
    EPS:Sep 18, 2023
    EPSS Score:0.01895
    CVSS Score:5.9

    Affected Products

    Vendor
    Fedoraproject
    Product
    Fedora
    Vendor
    Gnu
    Product
    Glibc
    Vendor
    Redhat
    Product
    Codeready Linux Builder Eus
    Vendor
    Redhat
    Product
    Codeready Linux Builder Eus For Power Little Endian
    Vendor
    Redhat
    Product
    Codeready Linux Builder Eus For Power Little Endian Eus
    Vendor
    Redhat
    Product
    Codeready Linux Builder For Arm64
    Vendor
    Redhat
    Product
    Codeready Linux Builder For Arm64 Eus
    Vendor
    Redhat
    Product
    Codeready Linux Builder For Ibm Z Systems
    Vendor
    Redhat
    Product
    Codeready Linux Builder For Ibm Z Systems Eus
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Enterprise Linux Eus
    Vendor
    Redhat
    Product
    Enterprise Linux For Arm 64
    Vendor
    Redhat
    Product
    Enterprise Linux For Arm 64 Eus
    Vendor
    Redhat
    Product
    Enterprise Linux For Ibm Z Systems
    Vendor
    Redhat
    Product
    Enterprise Linux For Ibm Z Systems Eus
    Vendor
    Redhat
    Product
    Enterprise Linux For Ibm Z Systems Eus S390x
    Vendor
    Redhat
    Product
    Enterprise Linux For Ibm Z Systems S390x
    Vendor
    Redhat
    Product
    Enterprise Linux For Power Little Endian
    Vendor
    Redhat
    Product
    Enterprise Linux For Power Little Endian Eus
    Vendor
    Redhat
    Product
    Enterprise Linux Server Aus
    Vendor
    Redhat
    Product
    Enterprise Linux Server For Power Little Endian Update Services For Sap Solutions
    Vendor
    Redhat
    Product
    Enterprise Linux Tus
    Vendor
    Redhat
    Product
    Rhel Eus
    Vendor
    Redhat
    Product
    Rhev Hypervisor

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-416 Use After Free

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

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    CVE-2026-35093 (CVSS 8.8) — A flaw was found in libinput. A local attacker who can place a specially crafted Lua bytecode file in certain …
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    CVE-2024-6293 (CVSS 8.8) — Use after free in Dawn in Google Chrome prior to 126.0.6478.126 allowed a remote attacker to potentially explo…
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    CVE-2024-6290 (CVSS 8.8) — Use after free in Dawn in Google Chrome prior to 126.0.6478.126 allowed a remote attacker to potentially explo…
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    References

    https://access.redhat.com/errata/RHSA-2023:5453
    https://access.redhat.com/errata/RHSA-2023:5455
    https://access.redhat.com/errata/RHSA-2023:7409
    https://access.redhat.com/security/cve/CVE-2023-4806
    https://bugzilla.redhat.com/show_bug.cgi?id=2237782
    http://www.openwall.com/lists/oss-security/2023/10/03/4
    http://www.openwall.com/lists/oss-security/2023/10/03/5
    http://www.openwall.com/lists/oss-security/2023/10/03/6
    http://www.openwall.com/lists/oss-security/2023/10/03/8
    https://access.redhat.com/errata/RHSA-2023:5453
    https://access.redhat.com/errata/RHSA-2023:5455
    https://access.redhat.com/errata/RHSA-2023:7409
    https://access.redhat.com/security/cve/CVE-2023-4806
    https://bugzilla.redhat.com/show_bug.cgi?id=2237782
    https://lists.fedoraproject.org/archives/list/[email protected]/message/4DBUQRRPB47TC3NJOUIBVWUGFHBJAFDL/
    https://lists.fedoraproject.org/archives/list/[email protected]/message/DFG4P76UHHZEWQ26FWBXG76N2QLKKPZA/
    https://lists.fedoraproject.org/archives/list/[email protected]/message/NDAQWHTSVOCOZ5K6KPIWKRT3JX4RTZUR/
    https://security.gentoo.org/glsa/202310-03
    https://security.netapp.com/advisory/ntap-20240125-0008/
    https://cert-portal.siemens.com/productcert/html/ssa-082556.html
    https://cert-portal.siemens.com/productcert/html/ssa-831302.html

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High