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This issue can affect BIND 9 resolvers with `stale-answer-enable yes;` that also make use of the option `stale-answer-client-timeout`, configured with a value greater than zero.
If the resolver receives many queries that require recursion, there will be a corresponding increase in the number of clients that are waiting for recursion to complete. If there are sufficient clients already waiting when a new client query is received so that it is necessary to SERVFAIL the longest waiting client (see BIND 9 ARM `recursive-clients` limit and soft quota), then it is possible for a race to occur between providing a stale answer to this older client and sending an early timeout SERVFAIL, which may cause an assertion failure. This issue affects BIND 9 versions 9.16.12 through 9.16.36, 9.18.0 through 9.18.10, 9.19.0 through 9.19.8, and 9.16.12-S1 through 9.16.36-S1.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade bind9.16-develUpgrade bind-chrootUpgrade bind9.16-utilsUpgrade bind-dnssec-utilsUpgrade bind-utilsUpgrade bind9.16-libsUpgrade bind9.16-licenseUpgrade bind-dnssec-docUpgrade bind-docUpgrade python3-bindUpgrade bind9.16-docUpgrade bind9.16-chrootUpgrade python3-bind9.16Upgrade bind9.16Upgrade bind-libsUpgrade bindUpgrade bind9.16-dnssec-utilsUpgrade bind-develUpgrade bind-license | May 15, 2023 | Jan 26, 2023 |
| Alpine Linux | — | Upgrade bind | Aug 22, 2024 | Jan 25, 2023 |
| Amazon_linux_2023 | — | Upgrade bind-pkcs11-libs-debuginfoUpgrade bind-dlz-filesystem-debuginfoUpgrade bind-debuginfoUpgrade bind-dlz-sqlite3Upgrade bind-dnssec-docUpgrade python3-bindUpgrade bind-pkcs11-utils-debuginfoUpgrade bind-pkcs11-libsUpgrade bind-pkcs11-debuginfoUpgrade bind-pkcs11-utilsUpgrade bind-utilsUpgrade bind-dlz-filesystemUpgrade bind-libsUpgrade bind-utils-debuginfoUpgrade bind-chrootUpgrade bind-licenseUpgrade bind-dlz-mysqlUpgrade bind-pkcs11Upgrade bind-dlz-sqlite3-debuginfoUpgrade bind-dnssec-utils-debuginfoUpgrade bind-dnssec-utilsUpgrade bindUpgrade bind-dlz-ldap-debuginfoUpgrade bind-dlz-mysql-debuginfoUpgrade bind-dlz-ldapUpgrade bind-libs-debuginfoUpgrade bind-develUpgrade bind-pkcs11-develUpgrade bind-debugsource | Feb 17, 2025 | Jan 25, 2023 |
| Centos_linux | — | Upgrade python3-bindUpgrade bind9.16-licenseUpgrade bind9.16-chrootUpgrade bind-licenseUpgrade bind9.16-debuginfoUpgrade bind9.16-utils-debuginfoUpgrade bind-libsUpgrade bind9.16-dnssec-utilsUpgrade bind-libs-debuginfoUpgrade python3-bind9.16Upgrade bind-dnssec-utils-debuginfoUpgrade bind9.16-utilsUpgrade bind9.16-libsUpgrade bind-dnssec-utilsUpgrade bindUpgrade bind9.16-dnssec-utils-debuginfoUpgrade bind-debugsourceUpgrade bind9.16-debugsourceUpgrade bind-utils-debuginfoUpgrade bind-dnssec-docUpgrade bind-chrootUpgrade bind9.16-libs-debuginfoUpgrade bind-utilsUpgrade bind-debuginfoUpgrade bind9.16 | May 15, 2023 | Jan 26, 2023 |
| Debian | — | Upgrade bind9 | Jan 30, 2023 | Jan 26, 2023 |
| Dns Bind | — | Upgrade ISC BIND to latest version | Mar 7, 2023 | Jan 26, 2023 |
| Huawei Euleros 2_0_sp11 | — | Upgrade bind-pkcs11-libsUpgrade python3-bindUpgrade bind-libsUpgrade bind-utilsUpgrade bind-pkcs11-utilsUpgrade bind-licenseUpgrade bind-pkcs11Upgrade bindUpgrade bind-dnssec-docUpgrade bind-chrootUpgrade bind-dnssec-utils | May 8, 2023 | Jan 26, 2023 |
| Ibm Aix | — | Apply the fix or workaround for bind_advisory23 | Jul 27, 2023 | Jan 26, 2023 |
| Oracle_linux | — | Upgrade bind9.16-chrootUpgrade bind-develUpgrade python3-bind9.16Upgrade bind9.16-develUpgrade bind-libsUpgrade bind9.16-utilsUpgrade bind9.16-dnssec-utilsUpgrade bind9.16Upgrade python3-bindUpgrade bind-dnssec-docUpgrade bind9.16-docUpgrade bind-licenseUpgrade bind-utilsUpgrade bind-chrootUpgrade bind-dnssec-utilsUpgrade bind9.16-libsUpgrade bind9.16-licenseUpgrade bind-docUpgrade bind | May 18, 2023 | Jan 25, 2023 |
| Redhat_linux | — | Upgrade bind-dnssec-docUpgrade bind-develUpgrade bind9.16-debugsourceUpgrade bind9.16-develUpgrade python3-bindUpgrade bind9.16-libsUpgrade bind-utilsUpgrade bind9.16-docUpgrade bind-docUpgrade bind-debuginfoUpgrade bind-chrootUpgrade bind9.16-dnssec-utils-debuginfoUpgrade bind-dnssec-utilsUpgrade bind9.16-utilsUpgrade bind-debugsourceUpgrade bind-libsUpgrade bind-dnssec-utils-debuginfoUpgrade bind9.16-chrootUpgrade bind9.16-dnssec-utilsUpgrade bind9.16-utils-debuginfoUpgrade bindUpgrade bind-licenseUpgrade bind-utils-debuginfoUpgrade bind9.16Upgrade bind9.16-libs-debuginfoUpgrade python3-bind9.16Upgrade bind9.16-debuginfoUpgrade bind9.16-licenseUpgrade bind-libs-debuginfo | May 15, 2023 | Jan 26, 2023 |
| Suse | — | Upgrade bind-utilsUpgrade bind-docUpgrade bindUpgrade python3-bind | Feb 13, 2023 | Jan 26, 2023 |
| Ubuntu | — | Upgrade bind9 | Mar 22, 2023 | Jan 26, 2023 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Jan 20, 2025 | Jan 25, 2023 |
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