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Samba: DNS signing DoS via TKEY name cache exhaustion.
Severity: Type: vulnerability
DNS signing DoS via TKEY name cache exhaustion. An unauthenticated user can repeatedly register names TKEY names, which floods a cache causing legitimate TKEYs to be expunged. This can practically block the use DNS TSIG signing.
Samba: DNS signing DoS via TKEY name cache exhaustion.
0
UnknownVulnerabilitygcveosvubuntu-cve-2026-58218ubuntu-pro-14-04-ltsubuntu-pro-16-04-ltsubuntu-pro-18-04-ltsubuntu-pro-20-04-ltsubuntu-22-04-ltsubuntu-24-04-ltsubuntu-26-04-lts
Published: 07/28/2026 (07/28/2026, 10:00:00 UTC)
Source: GCVE Database
Product: samba
Description
DNS signing DoS via TKEY name cache exhaustion. An unauthenticated user can repeatedly register names TKEY names, which floods a cache causing legitimate TKEYs to be expunged. This can practically block the use DNS TSIG signing.
Affected software
samba
pkg:deb/ubuntu/samba@2:4.3.11+dfsg-0ubuntu0.14.04.20+esm15?arch=source&distro=esm-infra-legacy/trustyAffected versions
=2:3.6.18-1ubuntu3=2:4.0.10+dfsg-4ubuntu2=2:4.0.13+dfsg-1ubuntu1=2:4.1.3+dfsg-2ubuntu2=2:4.1.3+dfsg-2ubuntu3=2:4.1.3+dfsg-2ubuntu4=2:4.1.3+dfsg-2ubuntu5=2:4.1.6+dfsg-1ubuntu1=2:4.1.6+dfsg-1ubuntu2=2:4.1.6+dfsg-1ubuntu2.14.04.1=2:4.1.6+dfsg-1ubuntu2.14.04.2=2:4.1.6+dfsg-1ubuntu2.14.04.3=2:4.1.6+dfsg-1ubuntu2.14.04.4=2:4.1.6+dfsg-1ubuntu2.14.04.5=2:4.1.6+dfsg-1ubuntu2.14.04.7=2:4.1.6+dfsg-1ubuntu2.14.04.8=2:4.1.6+dfsg-1ubuntu2.14.04.9=2:4.1.6+dfsg-1ubuntu2.14.04.11=2:4.1.6+dfsg-1ubuntu2.14.04.12=2:4.1.6+dfsg-1ubuntu2.14.04.13=2:4.3.8+dfsg-0ubuntu0.14.04.2=2:4.3.9+dfsg-0ubuntu0.14.04.1=2:4.3.9+dfsg-0ubuntu0.14.04.3=2:4.3.11+dfsg-0ubuntu0.14.04.1=2:4.3.11+dfsg-0ubuntu0.14.04.2=2:4.3.11+dfsg-0ubuntu0.14.04.3=2:4.3.11+dfsg-0ubuntu0.14.04.4=2:4.3.11+dfsg-0ubuntu0.14.04.6=2:4.3.11+dfsg-0ubuntu0.14.04.7=2:4.3.11+dfsg-0ubuntu0.14.04.8=2:4.3.11+dfsg-0ubuntu0.14.04.9=2:4.3.11+dfsg-0ubuntu0.14.04.10=2:4.3.11+dfsg-0ubuntu0.14.04.11=2:4.3.11+dfsg-0ubuntu0.14.04.12=2:4.3.11+dfsg-0ubuntu0.14.04.13=2:4.3.11+dfsg-0ubuntu0.14.04.14=2:4.3.11+dfsg-0ubuntu0.14.04.16=2:4.3.11+dfsg-0ubuntu0.14.04.17=2:4.3.11+dfsg-0ubuntu0.14.04.19=2:4.3.11+dfsg-0ubuntu0.14.04.20=2:4.3.11+dfsg-0ubuntu0.14.04.20+esm1=2:4.3.11+dfsg-0ubuntu0.14.04.20+esm2=2:4.3.11+dfsg-0ubuntu0.14.04.20+esm3=2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4=2:4.3.11+dfsg-0ubuntu0.14.04.20+esm6=2:4.3.11+dfsg-0ubuntu0.14.04.20+esm7=2:4.3.11+dfsg-0ubuntu0.14.04.20+esm8=2:4.3.11+dfsg-0ubuntu0.14.04.20+esm9=2:4.3.11+dfsg-0ubuntu0.14.04.20+esm11=2:4.3.11+dfsg-0ubuntu0.14.04.20+esm12=2:4.3.11+dfsg-0ubuntu0.14.04.20+esm13=2:4.3.11+dfsg-0ubuntu0.14.04.20+esm14=2:4.3.11+dfsg-0ubuntu0.14.04.20+esm15
samba
pkg:deb/ubuntu/samba@2:4.3.11+dfsg-0ubuntu0.16.04.34+esm4?arch=source&distro=esm-infra/xenialAffected versions
=2:4.1.17+dfsg-4ubuntu2=2:4.1.20+dfsg-1ubuntu1=2:4.1.20+dfsg-1ubuntu2=2:4.1.20+dfsg-1ubuntu3=2:4.1.20+dfsg-1ubuntu5=2:4.3.3+dfsg-1ubuntu1=2:4.3.3+dfsg-1ubuntu2=2:4.3.3+dfsg-1ubuntu3=2:4.3.6+dfsg-1ubuntu1=2:4.3.8+dfsg-0ubuntu1=2:4.3.9+dfsg-0ubuntu0.16.04.1=2:4.3.9+dfsg-0ubuntu0.16.04.2=2:4.3.9+dfsg-0ubuntu0.16.04.3=2:4.3.11+dfsg-0ubuntu0.16.04.1=2:4.3.11+dfsg-0ubuntu0.16.04.3=2:4.3.11+dfsg-0ubuntu0.16.04.5=2:4.3.11+dfsg-0ubuntu0.16.04.6=2:4.3.11+dfsg-0ubuntu0.16.04.7=2:4.3.11+dfsg-0ubuntu0.16.04.8=2:4.3.11+dfsg-0ubuntu0.16.04.9=2:4.3.11+dfsg-0ubuntu0.16.04.10=2:4.3.11+dfsg-0ubuntu0.16.04.11=2:4.3.11+dfsg-0ubuntu0.16.04.12=2:4.3.11+dfsg-0ubuntu0.16.04.13=2:4.3.11+dfsg-0ubuntu0.16.04.15=2:4.3.11+dfsg-0ubuntu0.16.04.16=2:4.3.11+dfsg-0ubuntu0.16.04.17=2:4.3.11+dfsg-0ubuntu0.16.04.18=2:4.3.11+dfsg-0ubuntu0.16.04.19=2:4.3.11+dfsg-0ubuntu0.16.04.20=2:4.3.11+dfsg-0ubuntu0.16.04.21=2:4.3.11+dfsg-0ubuntu0.16.04.23=2:4.3.11+dfsg-0ubuntu0.16.04.24=2:4.3.11+dfsg-0ubuntu0.16.04.25=2:4.3.11+dfsg-0ubuntu0.16.04.26=2:4.3.11+dfsg-0ubuntu0.16.04.27=2:4.3.11+dfsg-0ubuntu0.16.04.28=2:4.3.11+dfsg-0ubuntu0.16.04.29=2:4.3.11+dfsg-0ubuntu0.16.04.30=2:4.3.11+dfsg-0ubuntu0.16.04.31=2:4.3.11+dfsg-0ubuntu0.16.04.32=2:4.3.11+dfsg-0ubuntu0.16.04.34=2:4.3.11+dfsg-0ubuntu0.16.04.34+esm1=2:4.3.11+dfsg-0ubuntu0.16.04.34+esm2=2:4.3.11+dfsg-0ubuntu0.16.04.34+esm3=2:4.3.11+dfsg-0ubuntu0.16.04.34+esm4
samba
pkg:deb/ubuntu/samba@2:4.7.6+dfsg~ubuntu-0ubuntu2.29+esm3?arch=source&distro=esm-infra/bionicAffected versions
=2:4.6.7+dfsg-1ubuntu3=2:4.7.1+dfsg-1ubuntu1=2:4.7.3+dfsg-1ubuntu1=2:4.7.4+dfsg-1ubuntu1=2:4.7.6+dfsg~ubuntu-0ubuntu1=2:4.7.6+dfsg~ubuntu-0ubuntu2=2:4.7.6+dfsg~ubuntu-0ubuntu2.2=2:4.7.6+dfsg~ubuntu-0ubuntu2.4=2:4.7.6+dfsg~ubuntu-0ubuntu2.5=2:4.7.6+dfsg~ubuntu-0ubuntu2.6=2:4.7.6+dfsg~ubuntu-0ubuntu2.7=2:4.7.6+dfsg~ubuntu-0ubuntu2.9=2:4.7.6+dfsg~ubuntu-0ubuntu2.10=2:4.7.6+dfsg~ubuntu-0ubuntu2.11=2:4.7.6+dfsg~ubuntu-0ubuntu2.13=2:4.7.6+dfsg~ubuntu-0ubuntu2.14=2:4.7.6+dfsg~ubuntu-0ubuntu2.15=2:4.7.6+dfsg~ubuntu-0ubuntu2.16=2:4.7.6+dfsg~ubuntu-0ubuntu2.17=2:4.7.6+dfsg~ubuntu-0ubuntu2.18=2:4.7.6+dfsg~ubuntu-0ubuntu2.19=2:4.7.6+dfsg~ubuntu-0ubuntu2.20=2:4.7.6+dfsg~ubuntu-0ubuntu2.21=2:4.7.6+dfsg~ubuntu-0ubuntu2.23=2:4.7.6+dfsg~ubuntu-0ubuntu2.24=2:4.7.6+dfsg~ubuntu-0ubuntu2.26=2:4.7.6+dfsg~ubuntu-0ubuntu2.27=2:4.7.6+dfsg~ubuntu-0ubuntu2.28=2:4.7.6+dfsg~ubuntu-0ubuntu2.29=2:4.7.6+dfsg~ubuntu-0ubuntu2.29+esm1=2:4.7.6+dfsg~ubuntu-0ubuntu2.29+esm2=2:4.7.6+dfsg~ubuntu-0ubuntu2.29+esm3
samba
pkg:deb/ubuntu/samba@2:4.15.13+dfsg-0ubuntu0.20.04.8+esm2?arch=source&distro=esm-infra/focalAffected versions
=2:4.10.7+dfsg-0ubuntu2=2:4.10.7+dfsg-0ubuntu3=2:4.11.1+dfsg-3ubuntu1=2:4.11.1+dfsg-3ubuntu2=2:4.11.1+dfsg-3ubuntu4=2:4.11.5+dfsg-1ubuntu1=2:4.11.5+dfsg-1ubuntu2=2:4.11.6+dfsg-0ubuntu1=2:4.11.6+dfsg-0ubuntu1.1=2:4.11.6+dfsg-0ubuntu1.2=2:4.11.6+dfsg-0ubuntu1.3=2:4.11.6+dfsg-0ubuntu1.4=2:4.11.6+dfsg-0ubuntu1.5=2:4.11.6+dfsg-0ubuntu1.6=2:4.11.6+dfsg-0ubuntu1.8=2:4.11.6+dfsg-0ubuntu1.9=2:4.11.6+dfsg-0ubuntu1.10=2:4.13.14+dfsg-0ubuntu0.20.04.1=2:4.13.14+dfsg-0ubuntu0.20.04.2=2:4.13.14+dfsg-0ubuntu0.20.04.3=2:4.13.14+dfsg-0ubuntu0.20.04.4=2:4.13.17~dfsg-0ubuntu0.21.04.1=2:4.13.17~dfsg-0ubuntu0.21.04.2=2:4.13.17~dfsg-0ubuntu1.20.04.1=2:4.13.17~dfsg-0ubuntu1.20.04.2=2:4.13.17~dfsg-0ubuntu1.20.04.4=2:4.13.17~dfsg-0ubuntu1.20.04.5=2:4.15.13+dfsg-0ubuntu0.20.04.1=2:4.15.13+dfsg-0ubuntu0.20.04.2=2:4.15.13+dfsg-0ubuntu0.20.04.3=2:4.15.13+dfsg-0ubuntu0.20.04.4=2:4.15.13+dfsg-0ubuntu0.20.04.5=2:4.15.13+dfsg-0ubuntu0.20.04.6=2:4.15.13+dfsg-0ubuntu0.20.04.7=2:4.15.13+dfsg-0ubuntu0.20.04.8=2:4.15.13+dfsg-0ubuntu0.20.04.8+esm1=2:4.15.13+dfsg-0ubuntu0.20.04.8+esm2
samba
pkg:deb/ubuntu/samba@2:4.15.13+dfsg-0ubuntu1.13?arch=source&distro=jammyAffected versions
<2:4.15.13+dfsg-0ubuntu1.13=2:4.13.5+dfsg-2ubuntu2=2:4.13.5+dfsg-2ubuntu3=2:4.13.14+dfsg-0ubuntu1=2:4.13.14+dfsg-0ubuntu2=2:4.15.5~dfsg-0ubuntu1=2:4.15.5~dfsg-0ubuntu2=2:4.15.5~dfsg-0ubuntu4=2:4.15.5~dfsg-0ubuntu5=2:4.15.5~dfsg-0ubuntu5.1=2:4.15.9+dfsg-0ubuntu0.2=2:4.15.9+dfsg-0ubuntu0.3=2:4.15.13+dfsg-0ubuntu1=2:4.15.13+dfsg-0ubuntu1.1=2:4.15.13+dfsg-0ubuntu1.2=2:4.15.13+dfsg-0ubuntu1.3=2:4.15.13+dfsg-0ubuntu1.4=2:4.15.13+dfsg-0ubuntu1.5=2:4.15.13+dfsg-0ubuntu1.6=2:4.15.13+dfsg-0ubuntu1.7=2:4.15.13+dfsg-0ubuntu1.8=2:4.15.13+dfsg-0ubuntu1.9=2:4.15.13+dfsg-0ubuntu1.10=2:4.15.13+dfsg-0ubuntu1.12
samba
pkg:deb/ubuntu/samba@2:4.19.5+dfsg-4ubuntu9.7?arch=source&distro=nobleAffected versions
<2:4.19.5+dfsg-4ubuntu9.7=2:4.18.6+dfsg-1ubuntu2=2:4.18.6+dfsg-1ubuntu2.1=2:4.18.6+dfsg-1ubuntu2.2=2:4.19.4+dfsg-3ubuntu1=2:4.19.5+dfsg-1ubuntu1=2:4.19.5+dfsg-4ubuntu7=2:4.19.5+dfsg-4ubuntu8=2:4.19.5+dfsg-4ubuntu9=2:4.19.5+dfsg-4ubuntu9.2=2:4.19.5+dfsg-4ubuntu9.3=2:4.19.5+dfsg-4ubuntu9.4=2:4.19.5+dfsg-4ubuntu9.6
samba
pkg:deb/ubuntu/samba@2:4.23.6+dfsg-1ubuntu2.2?arch=source&distro=resoluteAffected versions
<2:4.23.6+dfsg-1ubuntu2.2=2:4.22.3+dfsg-4ubuntu2=2:4.22.3+dfsg-4ubuntu2.1=2:4.22.3+dfsg-4ubuntu3=2:4.22.3+dfsg-4ubuntu4=2:4.23.4+dfsg-1ubuntu1=2:4.23.5+dfsg-1ubuntu2=2:4.23.6+dfsg-1ubuntu1=2:4.23.6+dfsg-1ubuntu2=2:4.23.6+dfsg-1ubuntu2.1
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Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-58218
- Osv Schema Version
- 1.7.0
- Aliases
- []
- Ecosystems
- ["Ubuntu:Pro:14.04:LTS","Ubuntu:Pro:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:26.04:LTS"]
- Database Specific Severity
- null
- Cvss Version
- null
Threat ID: 6a6941bb9c2644c7f86af4b1
Added to database: 07/28/2026, 23:56:43 UTC
Last updated: 07/29/2026, 03:22:21 UTC
Views: 4
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