Bug 2510884 - CVE-2026-58216 samba: kpasswd service: kpasswd packet that contains malformed ASN.1 might cause the server to access 6 bytes of unallocated memory leading server to crash [fedora-all]
Summary: CVE-2026-58216 samba: kpasswd service: kpasswd packet that contains malformed...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Fedora
Classification: Fedora
Component: samba
Version: rawhide
Hardware: Unspecified
OS: Unspecified
medium
medium
Target Milestone: ---
Assignee: Guenther Deschner
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard: {"flaws": ["762d5c73-2d76-4946-b1e1-3...
Depends On:
Blocks: CVE-2026-58216
TreeView+ depends on / blocked
 
Reported: 2026-08-04 05:00 UTC by TEJ RATHI
Modified: 2026-08-07 01:37 UTC (History)
7 users (show)

Fixed In Version: samba-4.24.5-1.fc45 samba-4.24.5-1.fc44 samba-4.23.10-1.fc43
Clone Of:
Environment:
Last Closed: 2026-08-04 12:56:40 UTC
Type: ---
Embargoed:


Attachments (Terms of Use)

Description TEJ RATHI 2026-08-04 05:00:53 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.

A miscalculation means an ASN.1 structure used in a Kerberos password change is assumed to be six bytes bigger than it is. This does not affect ordinary packets (the ASN.1 itself contains the correct size), but a crafted ANS1 packet could force up to six unallocated bytes to be read. The usual outcome of this will be a decryption failure and an error message, but it could make the server process crash.

Comment 1 Fedora Update System 2026-08-04 10:49:17 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 10:49:33 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 10:49:33 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 12:56:40 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 01:33:39 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 01:56:49 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 17:17:11 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 01:37:38 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.


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