vulnerability
Ubuntu: USN-8124-1 (CVE-2026-3591): Bind vulnerabilities
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 6 | (AV:N/AC:L/Au:S/C:P/I:P/A:N) | Mar 25, 2026 | Mar 27, 2026 | Mar 27, 2026 |
Severity
6
CVSS
(AV:N/AC:L/Au:S/C:P/I:P/A:N)
Published
Mar 25, 2026
Added
Mar 27, 2026
Modified
Mar 27, 2026
Description
A use-after-return vulnerability exists in the `named` server when handling DNS queries signed with SIG(0). Using a specially-crafted DNS request, an attacker may be able to cause an ACL to improperly (mis)match an IP address. In a default-allow ACL (denying only specific IP addresses), this may lead to unauthorized access. Default-deny ACLs should fail-secure.
This issue affects BIND 9 versions 9.20.0 through 9.20.20, 9.21.0 through 9.21.19, and 9.20.9-S1 through 9.20.20-S1.
BIND 9 versions 9.18.0 through 9.18.46 and 9.18.11-S1 through 9.18.46-S1 are NOT affected.
Solution
ubuntu-upgrade-bind9
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