USN-8293-1: Bind vulnerabilities

Vitaly Simonovich discovered that Bind could exhaust memory during GSS-API
TKEY negotiation. A remote attacker could possibly use this issue to cause
Bind to use excessive resources, leading to a denial of service.
(CVE-2026-3039)

Shuhan Zhang discovered that Bind incorrectly handled self-pointed glue
records. A remote attacker could possibly use this issue to use Bind in
denial of service amplification attacks against other systems.
(CVE-2026-3592)

Naresh Kandula Parmar discovered that Bind incorrectly handled memory in
the DNS-over-HTTPS implementation. A remote attacker could possibly use
this issue to cause Bind to crash, resulting in a denial of service, or
execute arbitrary code. This issue only affected Ubuntu 25.10 and Ubuntu
26.04 LTS. (CVE-2026-3593)

It was discovered that Bind incorrectly handled DNS messages whose class
was not IN. A remote attacker could possibly use this issue to cause Bind
to crash, resulting in a denial of service. (CVE-2026-5946)

Naoki Wakamatsu discovered that Bind incorrectly handled SIG(0) validation
during a query flood. A remote attacker could possibly use this issue to
cause Bind to crash, resulting in a denial of service. This issue only
affected Ubuntu 25.10 and Ubuntu 26.04 LTS. (CVE-2026-5947)

Billy Baraja discovered that Bind had an unbounded resend loop in the
resolver. A remote attacker could possibly use this issue to cause Bind to
use excessive resources, leading to a denial of service. (CVE-2026-5950)