Description
ISC BIND 9.4.x, 9.5.x, 9.6.x, and 9.7.x before 9.7.6-P2; 9.8.x before 9.8.3-P2; 9.9.x before 9.9.1-P2; and 9.6-ESV before 9.6-ESV-R7-P2, when DNSSEC validation is enabled, does not properly initialize the failing-query cache, which allows remote attackers to cause a denial of service (assertion failure and daemon exit) by sending many queries.
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 | bind9 | 1:9.8.1.dfsg.P1-4.2 | — |
| Debian 13 | bind9 | 1:9.8.1.dfsg.P1-4.2 | — |
| Debian 12 | bind9 | 1:9.8.1.dfsg.P1-4.2 | — |
| Debian 6.0 | bind9 | 1:9.7.3.dfsg-1~squeeze6 | DSA-2517-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 6 | bind +5 | 32:9.8.2-0.10.rc1.el6_3.2 | RHSA-2012:1123 |
| RHEL 5 | bind +7 | 30:9.3.6-20.P1.el5_8.2 | RHSA-2012:1123 |
| RHEL 5 | bind97 +4 | 32:9.7.0-10.P2.el5_8.2 | RHSA-2012:1122 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | bind | 9.10.3P4-21.1 | openSUSE-SU-2024:10467-1 |
Advisories 4
- RHSA-2012:1123 Red Hat Security Advisory: bind security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2012:1122 Red Hat Security Advisory: bind97 security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- DSA-2517-1 bind9 - denial of service Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2024:10467-1 bind-9.10.3P4-21.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
References
- SSA:2012-341-01 vendor-advisory
- 51096 third-party-advisory
- RHSA-2012:1123 vendor-advisory
- openSUSE-SU-2012:0971 vendor-advisory
- RHSA-2012:1122 vendor-advisory
- APPLE-SA-2013-09-12-1 vendor-advisory
- 1027296 vdb-entry
- DSA-2517 vendor-advisory
- openSUSE-SU-2012:0969 vendor-advisory
- USN-1518-1 vendor-advisory
- http://support.apple.com/kb/HT5880
- https://kb.isc.org/article/AA-00729