Bug 2509266

Summary: CVE-2026-58218 samba: DNS signing DoS via TKEY name cache exhaustion [fedora-all]
Product: [Fedora] Fedora Reporter: TEJ RATHI <trathi>
Component: sambaAssignee: Guenther Deschner <gdeschner>
Status: CLOSED ERRATA QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: medium    
Version: rawhideCC: abokovoy, anoopcs, asn, gdeschner, pfilipen, sbose, ssorce
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["0e0e5e5a-a3fa-4ea1-9f1b-ac903ee398e7"]}
Fixed In Version: samba-4.24.5-1.fc45 samba-4.24.5-1.fc44 samba-4.23.10-1.fc43 Doc Type: ---
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2026-08-04 12:56:27 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 2502728    

Description TEJ RATHI 2026-07-30 12:50:54 UTC
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

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.

Comment 1 Fedora Update System 2026-08-04 10:49:03 UTC
FEDORA-2026-3be8175017 (freeipa-4.13.2-1.fc45 and samba-4.24.5-1.fc45) has been submitted as an update to Fedora 45.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-3be8175017

Comment 2 Fedora Update System 2026-08-04 10:49:20 UTC
FEDORA-2026-fcd4630c0d (freeipa-4.13.2-1.fc44 and samba-4.24.5-1.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-fcd4630c0d

Comment 3 Fedora Update System 2026-08-04 10:49:24 UTC
FEDORA-2026-8e7fa96cf3 (freeipa-4.13.2-1.fc43 and samba-4.23.10-1.fc43) has been submitted as an update to Fedora 43.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-8e7fa96cf3

Comment 4 Fedora Update System 2026-08-04 12:56:27 UTC
FEDORA-2026-3be8175017 (freeipa-4.13.2-1.fc45 and samba-4.24.5-1.fc45) has been pushed to the Fedora 45 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 5 Fedora Update System 2026-08-05 01:33:31 UTC
FEDORA-2026-8e7fa96cf3 has been pushed to the Fedora 43 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-8e7fa96cf3`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-8e7fa96cf3

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 6 Fedora Update System 2026-08-05 01:56:39 UTC
FEDORA-2026-fcd4630c0d has been pushed to the Fedora 44 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-fcd4630c0d`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-fcd4630c0d

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 7 Fedora Update System 2026-08-06 17:17:00 UTC
FEDORA-2026-fcd4630c0d (freeipa-4.13.2-1.fc44 and samba-4.24.5-1.fc44) has been pushed to the Fedora 44 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 8 Fedora Update System 2026-08-07 01:37:31 UTC
FEDORA-2026-8e7fa96cf3 (freeipa-4.13.2-1.fc43 and samba-4.23.10-1.fc43) has been pushed to the Fedora 43 stable repository.
If problem still persists, please make note of it in this bug report.