Description
The nameserver caching daemon (nscd) in the GNU C Library (aka glibc or libc6) 2.29 through 2.33, when processing a request for netgroup lookup, may crash due to a double-free, potentially resulting in degraded service or Denial of Service on the local system. This is related to netgroupcache.c.
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 | 2.31-10 | — |
| Debian 13 | glibc | 2.31-10 | — |
| Debian 12 | glibc | 2.31-10 | — |
| Debian 10 | glibc | 2.28-10+deb10u2 | DLA-3152-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | glibc | 2.31-0ubuntu9.7 | USN-5310-1 |
| Ubuntu 18.04 LTS | glibc | 2.27-3ubuntu1.5 | USN-5310-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | nscd +212 | 2.28-164.el8 | RHSA-2021:4358 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 8 | nss_hesiod +5 | 2.28-164.el8 | ALSA-2021:4358 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | glibc | 2.28-164.el8 | RLSA-2021:4358 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | glibc | 2.34-1.2 | openSUSE-SU-2024:10792-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | nscd +211 | 2.28-164.0.1.el8 | ELSA-2021-4358 |
Advisories 13
- ALSA-2021:4358 Moderate: glibc security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2021:4358 Red Hat Security Advisory: glibc security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- SSA-398330 SSA-398330: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP >= V3.1.0 and < V3.1.5 Siemens ProductCERT · Oct 13, 2026
- USN-5310-1 glibc vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DLA-3152-1 glibc - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2021:4358 Moderate: glibc security, bug fix, and enhancement update Rocky Linux Security Advisories · Feb 5, 2026
- openSUSE-SU-2024:10792-1 glibc-2.34-1.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- ICSA-23-348-10 Siemens SIMATIC S7-1500 CISA ICS & IT advisories · Aug 12, 2025
- WID-SEC-2022-1750 GNU libc: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Jun 18, 2024
- 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
- WID-SEC-2023-1432 Siemens SIMATIC S7: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jun 22, 2023
- ELSA-2021-4358 Moderate: glibc security, bug fix, and enhancement update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 16, 2021
References
- https://sourceware.org/bugzilla/show_bug.cgi?id=27462
- FEDORA-2021-6749bfcfd9 vendor-advisory
- FEDORA-2021-2ba993d6c5 vendor-advisory
- GLSA-202107-07 vendor-advisory
- [debian-lts-announce] 20221017 [SECURITY] [DLA 3152-1] glibc security update mailing-list