Medium [CVE-2026-10822] Key Record using PRIVATEDNS algorithm may lead to exit
This medium-severity Red Hat Linux advisory covers CVE-2026-10822 affecting Red Hat Hardened Images, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6.
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Summary
If BIND encounters a particular invalid data structure in a DNS record, it will accept the invalid data, and may subsequently abort and exit. BIND will first need to store a DNS record for a key (KEY, DNSKEY, etc.).
That key must specify a PRIVATEDNS algorithm (253), and in the algorithm identifier, improperly give a length longer than the actual identifier data. If BIND later needs to render that record to text, it will use the invalid length during processing, leading to a consistency check failing.
This Moderate impact flaw in BIND allows a specially crafted DNS key record with a PRIVATEDNS algorithm and overlong algorithm identifier to cause the named daemon to abort when rendering the record to text. The attack requires prior storage of the malformed record (requiring user interaction), limiting the immediate risk to most Red Hat deployments.
Red Hat severity: Moderate — CVSS 6.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H). Weakness: CWE-617.
Affected Red Hat products: Red Hat Hardened Images; Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat OpenShift Container Platform 4. Red Hat fixing advisory: RHSA-2026:54071.
Affected products named by the advisory: Red Hat package: bind9.16; Red Hat package: bind9.18; Red Hat package: dhcp.
- 9.18.0
- 9.18.50
- 9.20.0
- 9.20.24
- 9.21.0
- 9.21.23
- 9.18.11
- 9.20.9
Official advisory · high-confidence parse· fetched 15 hours ago·verify at source
- bind-main-9.20.26-0.1.hum1
- RHSA-2026:54071
Official advisory · high-confidence parse· fetched 15 hours ago·verify at source
Mitigation checklist
- Upgrade to the patched release most closely related to your current version of BIND 9: - 9.20.26 - 9.21.24 BIND Supported Preview Edition is a special feature preview branch of BIND provided to eligible ISC support customers. - 9.20.26-S1
Official advisory · high-confidence parse· fetched 15 hours ago·verify at source
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