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Advisory severityHigh7.5Red Hat Linux

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 8.6 Advanced Mission Critical Update Support.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-11622 Source published Source updated

VulniPulse record published Record updated

CVE-2026-11622
Affected products & platforms
Red Hat LinuxRed Hat Enterprise Linux
Open source advisory

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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 products named by the advisory: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 7 Extended Lifecycle Support; Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support; Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On; and 9 more.

Affected versions
  • 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 12 hours ago·verify at source

Fixed versions
  • 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
  • bind9.16-32:9.16.23-0.7.el8_6.11
  • bind9.16-32:9.16.23-0.14.el8_8.9
  • 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
  • openshift/ose-rhel-coreos-9:4.22.9.8.202608191915-0
  • bind-main-9.20.26-0.1.hum1
  • RHSA-2026:55437
  • RHSA-2026:60383
  • RHSA-2026:54509
  • RHSA-2026:54654
  • RHSA-2026:80501
  • RHSA-2026:79160
  • RHSA-2026:54510
  • RHSA-2026:55442
  • RHSA-2026:57189
  • RHSA-2026:55441
  • RHSA-2026:57362
  • RHSA-2026:54071

Official advisory · high-confidence parse· fetched 12 hours 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, bind9.16-32:9.16.23-0.7.el8_6.11, bind9.16-32:9.16.23-0.14.el8_8.9. That is the remediation for this advisory.

The vendor advisory may list interim mitigations or workarounds not captured here. Review it before change work.

Official advisory · high-confidence parse· fetched 12 hours ago·verify at source

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