Описание
A DNSSEC validating resolver that is under a random subdomain attack against a DNSSEC-signed zone can suffer from runaway memory usage. The attacker needs to be able to send queries faster than the resolver can perform validation. The increased memory usage can be orders of magnitude beyond the limit configured in the max-cache-size parameter.
This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.
A DNSSEC validating resolver that is under a random subdomain attack against a DNSSEC-signed zone can suffer from runaway memory usage. The attacker needs to be able to send queries faster than the resolver can perform validation. The increased memory usage can be orders of magnitude beyond the limit configured in the max-cache-size parameter
Отчет
This Important flaw in BIND's DNSSEC-validating resolver can lead to a denial of service. An attacker can trigger excessive memory usage by performing a random subdomain attack against a DNSSEC-signed zone, causing the resolver to exceed its max-cache-size limits. This is critical for Red Hat deployments where BIND is configured for DNSSEC validation and exposed to untrusted query sources.
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| Red Hat Enterprise Linux 10 | bind | Affected | ||
| Red Hat Enterprise Linux 6 | bind | Affected | ||
| Red Hat Enterprise Linux 7 | bind | Affected | ||
| Red Hat Enterprise Linux 8 | bind | Affected | ||
| Red Hat Enterprise Linux 8 | bind9.16 | Affected | ||
| Red Hat Enterprise Linux 9 | bind | Affected | ||
| Red Hat Enterprise Linux 9 | bind9.18 | Affected | ||
| Red Hat Enterprise Linux 9 | dhcp | Not affected | ||
| Red Hat OpenShift Container Platform 4 | rhcos | Affected | ||
| Red Hat Hardened Images | bind-main-9.20.26-0.1.hum1 | Fixed | RHSA-2026:54071 | 12.08.2026 |
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Дополнительная информация
Статус:
EPSS
7.5 High
CVSS3
Связанные уязвимости
A DNSSEC validating resolver that is under a random subdomain attack against a DNSSEC-signed zone can suffer from runaway memory usage. The attacker needs to be able to send queries faster than the resolver can perform validation. The increased memory usage can be orders of magnitude beyond the limit configured in the `max-cache-size` parameter. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.
A DNSSEC validating resolver that is under a random subdomain attack against a DNSSEC-signed zone can suffer from runaway memory usage. The attacker needs to be able to send queries faster than the resolver can perform validation. The increased memory usage can be orders of magnitude beyond the limit configured in the `max-cache-size` parameter. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.
A DNSSEC validating resolver that is under a random subdomain attack a ...
A DNSSEC validating resolver that is under a random subdomain attack against a DNSSEC-signed zone can suffer from runaway memory usage. The attacker needs to be able to send queries faster than the resolver can perform validation. The increased memory usage can be orders of magnitude beyond the limit configured in the `max-cache-size` parameter. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.
EPSS
7.5 High
CVSS3