USN-8648-1

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USN-8648-1

Summary: bind9 vulnerabilities

Details: It was discovered that Bind incorrectly accepted NSEC3 records whose signer name did not match the owning zone. A remote attacker could possibly use this issue to perform NSEC3 impersonation attacks, bypassing DNSSEC validation. (CVE-2026-10723) It was discovered that Bind incorrectly handled Key Records using the PRIVATEDNS algorithm. A remote attacker could possibly use this issue to cause Bind to crash, resulting in a denial of service. (CVE-2026-10822) It was discovered that Bind incorrectly handled wildcard CNAME expansion in Response Policy Zones. A remote attacker could possibly use this issue to bypass configured RPZ policies. (CVE-2026-11331) It was discovered that Bind performed unnecessary validation of DNSSEC signed records. A remote attacker could possibly use this issue to cause Bind to use excessive resources, leading to a denial of service. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-11605) It was discovered that Bind incorrectly tracked memory usage in the DNS cache. A remote attacker could possibly use this issue to cause Bind to use memory beyond configured limits, leading to a denial of service. (CVE-2026-11622) It was discovered that Bind incorrectly handled signed wildcard records with label count discrepancies and RRSIG validation. A remote attacker could possibly use this issue to perform cache poisoning attacks. (CVE-2026-11721) It was discovered that Bind incorrectly handled certain CNAME and DNAME record orderings in the resolver. A remote attacker could possibly use this issue to cause Bind to crash, resulting in a denial of service. (CVE-2026-12617) It was discovered that Bind incorrectly validated out-of-zone NSEC next owner names during DNSSEC validation. A remote attacker could possibly use this issue to bypass DNSSEC validation. (CVE-2026-13321)

References: https://ubuntu.com/security/notices/USN-8648-1, https://ubuntu.com/security/CVE-2026-10723, https://ubuntu.com/security/CVE-2026-10822, https://ubuntu.com/security/CVE-2026-11331, https://ubuntu.com/security/CVE-2026-11605, https://ubuntu.com/security/CVE-2026-11622, https://ubuntu.com/security/CVE-2026-11721, https://ubuntu.com/security/CVE-2026-12617, https://ubuntu.com/security/CVE-2026-13321