CVE-2023-4806 (GCVE-0-2023-4806)

Vulnerability from cvelistv5 – Published: 2023-09-18 16:33 – Updated: 2026-05-12 10:12
VLAI
Title
Glibc: potential use-after-free in getaddrinfo()
Summary
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.
Severity
5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
Assigner
References
URL Tags
https://access.redhat.com/errata/RHBA-2024:2413 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2023:5453 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2023:5455 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2023:7409 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2023-4806 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2237782 issue-trackingx_refsource_REDHAT
Impacted products
Vendor Product Version
Red Hat Red Hat Enterprise Linux 8 Unaffected: 0:2.28-225.el8_8.6 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:8::baseos
    cpe:/a:redhat:enterprise_linux:8::appstream
    cpe:/a:redhat:enterprise_linux:8::crb
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 8 Unaffected: 0:2.28-225.el8_8.6 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:8::baseos
    cpe:/a:redhat:enterprise_linux:8::appstream
    cpe:/a:redhat:enterprise_linux:8::crb
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Unaffected: 0:2.28-189.8.el8_6 , < * (rpm)
    cpe:/o:redhat:rhev_hypervisor:4.4::el8
    cpe:/a:redhat:rhel_eus:8.6::appstream
    cpe:/o:redhat:rhel_eus:8.6::baseos
    cpe:/a:redhat:rhel_eus:8.6::crb
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 9 Unaffected: 0:2.34-100.el9 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:9::appstream
    cpe:/o:redhat:enterprise_linux:9::baseos
    cpe:/a:redhat:enterprise_linux:9::crb
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 9 Unaffected: 0:2.34-60.el9_2.7 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:9::appstream
    cpe:/o:redhat:enterprise_linux:9::baseos
    cpe:/a:redhat:enterprise_linux:9::crb
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 9 Unaffected: 0:2.34-100.el9 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:9::appstream
    cpe:/o:redhat:enterprise_linux:9::baseos
    cpe:/a:redhat:enterprise_linux:9::crb
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 9 Unaffected: 0:2.34-60.el9_2.7 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:9::appstream
    cpe:/o:redhat:enterprise_linux:9::baseos
    cpe:/a:redhat:enterprise_linux:9::crb
 Create a notification for this product.
Red Hat Red Hat Virtualization 4 for Red Hat Enterprise Linux 8 Unaffected: 0:2.28-189.8.el8_6 , < * (rpm)
    cpe:/o:redhat:rhev_hypervisor:4.4::el8
    cpe:/a:redhat:rhel_eus:8.6::appstream
    cpe:/o:redhat:rhel_eus:8.6::baseos
    cpe:/a:redhat:rhel_eus:8.6::crb
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 7     cpe:/o:redhat:enterprise_linux:7
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 7     cpe:/o:redhat:enterprise_linux:7
 Create a notification for this product.
Date Public
2023-09-12 00:00
Credits
This issue was discovered by Siddhesh Poyarekar (Red Hat).
Show details on NVD website
To clipboard 

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\"version\": \"0:2.28-189.8.el8_6\", \"lessThan\": \"*\", \"versionType\": \"rpm\"}], \"packageName\": \"glibc\", \"collectionURL\": \"https://access.redhat.com/downloads/content/package-browser/\", \"defaultStatus\": \"affected\"}, {\"cpes\": [\"cpe:/o:redhat:enterprise_linux:6\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat Enterprise Linux 6\", \"packageName\": \"compat-glibc\", \"collectionURL\": \"https://access.redhat.com/downloads/content/package-browser/\", \"defaultStatus\": \"unknown\"}, {\"cpes\": [\"cpe:/o:redhat:enterprise_linux:6\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat Enterprise Linux 6\", \"packageName\": \"glibc\", \"collectionURL\": \"https://access.redhat.com/downloads/content/package-browser/\", \"defaultStatus\": \"unknown\"}, {\"cpes\": [\"cpe:/o:redhat:enterprise_linux:7\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat Enterprise Linux 7\", \"packageName\": \"compat-glibc\", \"collectionURL\": \"https://access.redhat.com/downloads/content/package-browser/\", \"defaultStatus\": \"affected\"}, {\"cpes\": [\"cpe:/o:redhat:enterprise_linux:7\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat Enterprise Linux 7\", \"packageName\": \"glibc\", \"collectionURL\": \"https://access.redhat.com/downloads/content/package-browser/\", \"defaultStatus\": \"affected\"}], \"timeline\": [{\"lang\": \"en\", \"time\": \"2023-09-06T00:00:00.000Z\", \"value\": \"Reported to Red Hat.\"}, {\"lang\": \"en\", \"time\": \"2023-09-12T00:00:00.000Z\", \"value\": \"Made public.\"}], \"datePublic\": \"2023-09-12T00:00:00.000Z\", \"references\": [{\"url\": \"https://access.redhat.com/errata/RHBA-2024:2413\", \"name\": \"RHBA-2024:2413\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2023:5453\", \"name\": \"RHSA-2023:5453\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2023:5455\", \"name\": \"RHSA-2023:5455\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2023:7409\", \"name\": \"RHSA-2023:7409\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/security/cve/CVE-2023-4806\", \"tags\": [\"vdb-entry\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://bugzilla.redhat.com/show_bug.cgi?id=2237782\", \"name\": \"RHBZ#2237782\", \"tags\": [\"issue-tracking\", \"x_refsource_REDHAT\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"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.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-416\", \"description\": \"Use After Free\"}]}], \"providerMetadata\": {\"orgId\": \"53f830b8-0a3f-465b-8143-3b8a9948e749\", \"shortName\": \"redhat\", \"dateUpdated\": \"2025-11-20T17:55:55.988Z\"}, \"x_redhatCweChain\": \"CWE-416: Use After Free\"}}",
      "cveMetadata": "{\"cveId\": \"CVE-2023-4806\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-12T10:12:41.135Z\", \"dateReserved\": \"2023-09-06T16:26:35.613Z\", \"assignerOrgId\": \"53f830b8-0a3f-465b-8143-3b8a9948e749\", \"datePublished\": \"2023-09-18T16:33:57.211Z\", \"assignerShortName\": \"redhat\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.