HighFix available
bind — security advisory
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.
- Products
- bind
- Affected versions
- Not specified
- Fixed versions
- 9.16.37-r0, 9.18.11-r0
- CVEs
- CVE-2022-3924
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 30 Oct 2026, 14:17 UTC · Revision 1
Source evidence
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.
osv:ALPINE-CVE-2022-3924
bind
Fixed versions: 9.16.37-r0
bind
Fixed versions: 9.16.37-r0
bind
Fixed versions: 9.16.37-r0
bind
Fixed versions: 9.18.11-r0
bind
Fixed versions: 9.18.11-r0
bind
Fixed versions: 9.18.11-r0
bind
Fixed versions: 9.18.11-r0
bind
Fixed versions: 9.18.11-r0
bind
Fixed versions: 9.18.11-r0
bind
Fixed versions: 9.18.11-r0
bind
Fixed versions: 9.18.11-r0
Complete source record
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"method": "structured",
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"summary": "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.",
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"severity": "high",
"structured": {
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"aliases": [
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"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
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],
"modified": "2026-10-15T07:17:54.244748845Z",
"provider": "osv",
"upstream": [
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],
"references": [
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]
},
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"security_relevant": true,
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},
"source_id": "core-osv",
"document_id": 321947,
"published_at": "2023-01-26T21:16:03.273+00:00"
}