CVE-2023-4806

Advisory lineage Upstream: 0 Downstream: 9
Modified
Published: 18 Sept 2023, 16:33
Last modified:12 May 2026, 10:12

Vulnerability Summary

Overall Risk (default)
low
24/100
CVSS Score
5.9 MEDIUM
v3.1 (cve.org)
EPSS Score
1.9% LOW
2% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

18 Sept 2023, 16:33
Published
Vulnerability first disclosed
12 May 2026, 10:12
Last Modified
Vulnerability information updated

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 Metrics

  • v3.1•MEDIUM•Score: 5.9CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Trends

Current EPSS score: 1.90%• Percentile: 84%

Techniques & Countermeasures

  • CWE-416•Use After Free

    The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

Affected Systems

  • fedoraproject•fedora

    37 | 38 | 39

  • gnu•glibc

    2.33

  • redhat•codeready_linux_builder_eus

    9.2

  • redhat•codeready_linux_builder_eus_for_power_little_endian

    9.0_ppc64le

  • redhat•codeready_linux_builder_eus_for_power_little_endian_eus

    9.2_ppc64le

  • redhat•codeready_linux_builder_for_arm64

    9.0_aarch64

  • redhat•codeready_linux_builder_for_arm64_eus

    9.2_aarch64

  • redhat•codeready_linux_builder_for_ibm_z_systems

    9.0_s390x

  • redhat•codeready_linux_builder_for_ibm_z_systems_eus

    9.2_s390x

  • redhat•enterprise_linux

    7.0 | 8.0 | 9.0

  • redhat•enterprise_linux_eus

    8.8 | 9.2

  • redhat•enterprise_linux_for_arm_64

    9.0_aarch64

  • redhat•enterprise_linux_for_arm_64_eus

    9.2_aarch64

  • redhat•enterprise_linux_for_ibm_z_systems

    8.0_s390x

  • redhat•enterprise_linux_for_ibm_z_systems_eus

    8.8_s390x

  • redhat•enterprise_linux_for_ibm_z_systems_eus_s390x

    9.2

  • redhat•enterprise_linux_for_ibm_z_systems_s390x

    9.2

  • redhat•enterprise_linux_for_power_little_endian

    8.0_ppc64le | 9.2_ppc64le

  • redhat•enterprise_linux_for_power_little_endian_eus

    8.8_ppc64le | 9.2_ppc64le

  • redhat•enterprise_linux_server_aus

    9.2

  • redhat•enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions

    9.2_ppc64le

  • redhat•enterprise_linux_tus

    8.8

References (17)