High [CVE-2026-11622] Potential memory usage beyond configured limits
This high-severity Red Hat Linux advisory covers CVE-2026-11622 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7 Extended Lifecycle Support, Red Hat Enterprise Linux 8.
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Summary
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.
This Important flaw in BIND's DNSSEC-validating resolver can lead to a denial of service. Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
Weakness: CWE-400.
Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 7 Extended Lifecycle Support; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions; Red Hat Enterprise Linux 9.6 Extended Update Support; Red Hat OpenShift Container Platform 4.22; Red Hat Hardened Images; Red Hat Enterprise Linux 6.
Red Hat lists Red Hat Enterprise Linux 9 as not affected. Red Hat fixing advisory: RHSA-2026:55437, RHSA-2026:60383, RHSA-2026:54509, RHSA-2026:54654, RHSA-2026:54510, RHSA-2026:55442, RHSA-2026:57189, RHSA-2026:55441, RHSA-2026:57362, RHSA-2026:54071.
- 9.11.0
- 9.18.50
- 9.20.0
- 9.20.24
- 9.21.0
- 9.21.23
- 9.11.3
- 9.20.9
Official advisory · high-confidence parse· fetched 8 days ago·verify at source
- bind-32:9.18.33-15.el10_2.10
- bind-32:9.11.4-26.P2.el7_9.21
- bind9.16-32:9.16.23-0.22.el8_10.12
- bind-32:9.11.36-16.el8_10.14
- bind-32:9.16.23-40.el9_8.8
- bind9.18-32:9.18.29-14.el9_8.8
- bind-32:9.16.23-18.el9_4.12
- bind-32:9.16.23-31.el9_6.4
- rhcos-4.22.9.8.202608191915-0
- bind-main-9.20.26-0.1.hum1
- RHSA-2026:55437
- RHSA-2026:60383
- RHSA-2026:54509
- RHSA-2026:54654
- RHSA-2026:54510
- RHSA-2026:55442
- RHSA-2026:57189
- RHSA-2026:55441
- RHSA-2026:57362
- RHSA-2026:54071
Official advisory · high-confidence parse· fetched 8 days ago·verify at source
Mitigation
Upgrade to a fixed release: bind-32:9.18.33-15.el10_2.10, bind-32:9.11.4-26.P2.el7_9.21, bind9.16-32:9.16.23-0.22.el8_10.12, bind-32:9.11.36-16.el8_10.14, bind-32:9.16.23-40.el9_8.8, bind9.18-32:9.18.29-14.el9_8.8. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 8 days ago·verify at source
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