CVE-2023-4806Glibc: potential use-after-free in getaddrinfo()
Updated under an hour ago ()
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It affects Red Hat Enterprise Linux 8 and 5 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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
- 5.9 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-416
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- redhat
- NVD analysis
- Not yet received
- Record last updated
- Oct 14, 2026
- First seen by InfoSec Signals
- Oct 14, 2026
Affected products
Red Hat Red Hat Enterprise Linux 8 redhat:enterprise_linux | from 0:2.28-225.el8_8.6 not affected | CNA record |
Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support redhat:rhel_eus | from 0:2.28-189.8.el8_6 not affected | CNA record |
Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support redhat:rhev_hypervisor | from 0:2.28-189.8.el8_6 not affected | CNA record |
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.5 | CISA ADP |
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name) | from V3.1.5 | CISA ADP |
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.5 | CISA ADP |
References
- https://access.redhat.com/errata/RHSA-2023:5453vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2023:5455vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2023:7409vendor-advisory, x-refsource-redhat
- https://access.redhat.com/security/cve/CVE-2023-4806vdb-entry, x-refsource-redhat
- https://bugzilla.redhat.com/show_bug.cgi?id=2237782issue-tracking, x-refsource-redhat
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.