Description
Buffer overflow in the gethostbyname_r and other unspecified NSS functions in the GNU C Library (aka glibc or libc6) before 2.22 allows context-dependent attackers to cause a denial of service (crash) or execute arbitrary code via a crafted DNS response, which triggers a call with a misaligned buffer.
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 | 2.19-20 | — |
| Debian 13 | glibc | 2.19-20 | — |
| Debian 12 | glibc | 2.19-20 | — |
| Debian 7 | eglibc | 2.13-38+deb7u10 | DSA-3480-1 |
| Debian 6.0 | eglibc | 2.11.3-4+deb6u6 | DLA-230-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | eglibc | 2.19-0ubuntu6.8 | USN-2985-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | nscd +7 | 2.17-105.el7 | RHSA-2015:2199 |
| RHEL 6 | nscd +7 | 2.12-1.149.el6_6.7 | RHSA-2015:0863 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7.1 EUS | nscd +7 | 2.17-79.ael7b_1 | RHSA-2015:2589 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 | glibc | 2.19-22.7.1 | SUSE-SU-2015:1844-1 |
| SLES 11 SP4 | glibc | 2.11.3-17.87.3 | SUSE-SU-2015:1424-1 |
| SLES 11 SP3 | glibc | 2.11.3-17.87.3 | SUSE-SU-2015:1424-1 |
| SLES 11 SP2 | glibc | 2.11.3-17.45.66.1 | SUSE-SU-2016:0470-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 | glibc | 2.19-22.7.1 | SUSE-SU-2015:1844-1 |
| SLES for SAP 11 SP4 | glibc | 2.11.3-17.87.3 | SUSE-SU-2015:1424-1 |
| SLES for SAP 11 SP3 | glibc | 2.11.3-17.87.3 | SUSE-SU-2015:1424-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | glibc | 2.24-2.3 | openSUSE-SU-2024:10154-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | nscd +6 | 2.17-105.0.1.el7 | ELSA-2015-2199 |
Advisories 11
- RHSA-2015:2589 Red Hat Security Advisory: glibc security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2015:2199 Red Hat Security Advisory: glibc security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2015:0863 Red Hat Security Advisory: glibc security and bug fix update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- USN-2985-1 eglibc, glibc vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DLA-230-1 eglibc - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-3480-1 eglibc - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2015:1844-1 Security update for glibc SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:0470-1 Security update for glibc SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2015:1424-1 Security update for glibc SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10154-1 glibc-2.24-2.3 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- ELSA-2015-2199 Moderate: glibc security, bug fix, and enhancement update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Nov 24, 2015
References
- SUSE-SU-2015:1424 vendor-advisory
- [libc-alpha] 20150814 The GNU C Library version 2.22 is now available mailing-list
- SUSE-SU-2016:0470 vendor-advisory
- USN-2985-2 vendor-advisory
- GLSA-201602-02 vendor-advisory
- http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
- https://sourceware.org/git/?p=glibc.git%3Ba=commit%3Bh=2959eda9272a03386
- FEDORA-2016-0480defc94 vendor-advisory
- RHSA-2015:0863 vendor-advisory
- DSA-3480 vendor-advisory
- USN-2985-1 vendor-advisory
- https://sourceware.org/bugzilla/show_bug.cgi?id=18287
- 1032178 vdb-entry
- 74255 vdb-entry