Description
The send_dg function in resolv/res_send.c in GNU C Library (aka glibc or libc6) before 2.20 does not properly reuse file descriptors, which allows remote attackers to send DNS queries to unintended locations via a large number of requests that trigger a call to the getaddrinfo function.
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 | 2.19-1 | — |
| Debian 13 | glibc | 2.19-1 | — |
| Debian 12 | glibc | 2.19-1 | — |
| Debian 6.0 | eglibc | 2.11.3-4+deb6u5 | DLA-165-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | eglibc | 2.19-0ubuntu6.6 | USN-2519-1 |
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 2 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 |
| RHEL 6.5 AUS | nscd +7 | 2.12-1.132.el6_5.8 | RHSA-2016:1207 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 | glibc | 2.19-20.3 | SUSE-SU-2015:0526-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 | glibc | 2.19-20.3 | SUSE-SU-2015:0526-1 |
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 9
- RHSA-2016:1207 Red Hat Security Advisory: glibc security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- 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-2519-1 eglibc, glibc vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DLA-165-1 eglibc - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2015:0526-1 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
- https://github.com/golang/go/issues/6336
- [oss-security] 20150128 Re: the other glibc issue mailing-list
- openSUSE-SU-2015:0351 vendor-advisory
- GLSA-201602-02 vendor-advisory
- https://sourceware.org/bugzilla/show_bug.cgi?id=15946
- USN-2519-1 vendor-advisory
- RHSA-2015:0863 vendor-advisory
- 72844 vdb-entry
- RHSA-2016:1207 vendor-advisory
- 20210901 SEC Consult SA-20210901-0 :: Multiple vulnerabilities in MOXA devices mailing-list
- http://packetstormsecurity.com/files/164014/Moxa-Command-Injection-Cross-Site-Scripting-Vulnerable-Software.html