Bug 2509257

Summary: CVE-2026-6949 samba: TSIG packet with crafted name compression can crash DNS server [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: high Docs Contact:
Priority: high    
Version: rawhideCC: abokovoy, anoopcs, asn, gdeschner, pfilipen, sbose, ssorce
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["8dbe1826-0358-4e2e-b1ff-2e30a746f8d1"]}
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 12:56:23 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: 2502730    

Description TEJ RATHI 2026-07-30 12:03:56 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.

Incorrect size calculations when a TSIG record contains compressed names can lead to a large out-of-bounds write causing the server to crash.

Comment 1 Fedora Update System 2026-08-04 10:49:00 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 10:49:14 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 10:49:21 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 12:56:23 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 01:33:29 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 01:56:37 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 17:16:57 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 01:37:28 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.