Description
A flaw was found in glibc. When the getaddrinfo function is called with the AF_UNSPEC address family and the system is configured with no-aaaa mode via /etc/resolv.conf, a DNS response via TCP larger than 2048 bytes can potentially disclose stack contents through the function returned address data, and may cause a crash.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 8 | — | — |
| Red Hat | Red Hat Enterprise Linux 9 | — | — |
| Red Hat | Red Hat Enterprise Linux 6 | — | — |
| Red Hat | Red Hat Enterprise Linux 7 | — | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | glibc | 2.37-9 | — |
| Debian 13 | glibc | 2.37-9 | — |
| Debian 12 | glibc | 2.36-9+deb12u3 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | nscd +214 | 2.34-60.el9_2.7 | RHSA-2023:5453 |
| RHEL 8 | nscd +213 | 2.28-225.el8_8.6 | RHSA-2023:5455 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | nscd +214 | 2.34-60.el9_2.7 | ALSA-2023:5453 |
| AlmaLinux 8 | nscd +213 | 2.28-225.el8_8.6 | ALSA-2023:5455 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | glibc | 2.28-225.el8_8.6 | RLSA-2023:5455 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | glibc | 2.38-3.1 | openSUSE-SU-2024:13273-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | nscd +217 | 2.34-52.amzn2023.0.6 | ALAS2023-2023-359 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | glibc | 2.38-11 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | nscd +214 | 2.34-60.0.3.el9_2.7 | ELSA-2023-5453 |
| Oracle Linux 8 | nscd +213 | 2.28-225.0.4.el8_8.6 | ELSA-2023-5455 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | glibc | 2.38-r2 | — |
Advisories 15
- ALSA-2023:5453 Important: glibc security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2023:5455 Important: glibc security update AlmaLinux Security Advisories · Oct 29, 2026
- SSA-082556 SSA-082556: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP V3.1.5 Siemens ProductCERT · Oct 13, 2026
- WID-SEC-2023-2384 GNU libc: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 1, 2026
- RHSA-2023:5455 Red Hat Security Advisory: glibc security update Red Hat Security Advisories (RHSA) · Jul 15, 2026
- RHSA-2023:5453 Red Hat Security Advisory: glibc security update Red Hat Security Advisories (RHSA) · Jul 15, 2026
- ICSA-25-162-05 Siemens SIMATIC S7-1500 CPU family CISA ICS & IT advisories · May 14, 2026
- RLSA-2023:5455 Important: glibc security update Rocky Linux Security Advisories · Feb 5, 2026
- openSUSE-SU-2024:13273-1 glibc-2.38-3.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- NCSC-2025-0187 Kwetsbaarheden verholpen in Siemens producten NCSC-NL (Netherlands) · Jun 10, 2025
- ICSA-23-166-10 Siemens SIMATIC S7-1500 TM MFP BIOS CISA ICS & IT advisories · Apr 9, 2024
- SSA-831302 SSA-831302: Vulnerabilities in the BIOS of the SIMATIC S7-1500 TM MFP before V1.3.0 Siemens ProductCERT · Apr 9, 2024
- ELSA-2023-5455 Important: glibc security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Dec 19, 2023
- ELSA-2023-5453 Important: glibc security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Oct 10, 2023
- ALAS2023-2023-359 Important: glibc security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Oct 3, 2023
References
- RHSA-2023:5453 vendor-advisory
- RHSA-2023:5455 vendor-advisory
- https://access.redhat.com/security/cve/CVE-2023-4527 vdb-entry
- RHBZ#2234712 issue-tracking