CVE-2018-16841
Samba from version 4.3.0 and before versions 4.7.12, 4.8.7 and 4.9.3 are vulnerable to a denial of service.
Does this matter?
Lower severity and a low EPSS score (4.59%). Track it; it rarely justifies an emergency change on its own.
Description
Samba from version 4.3.0 and before versions 4.7.12, 4.8.7 and 4.9.3 are vulnerable to a denial of service. When configured to accept smart-card authentication, Samba's KDC will call talloc_free() twice on the same memory if the principal in a validly signed certificate does not match the principal in the AS-REQ. This is only possible after authentication with a trusted certificate. talloc is robust against further corruption from a double-free with talloc_free() and directly calls abort(), terminating the KDC process.
- CVSS 3.1
- 6.5 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 4.59% probability · 92th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-416, CWE-415
- Affected
- samba/samba · canonical/ubuntu linux · debian/debian linux
- Source
- secalert@redhat.com
EPSS 4.6% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://www.securityfocus.com/bid/106023Third Party Advisory, VDB Entry
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16841Issue Tracking, Third Party Advisory
- https://security.gentoo.org/glsa/202003-52Third Party Advisory
- https://security.netapp.com/advisory/ntap-20181127-0001/Third Party Advisory
- https://usn.ubuntu.com/3827-1/Third Party Advisory
- https://usn.ubuntu.com/3827-2/Third Party Advisory
- https://www.debian.org/security/2018/dsa-4345Third Party Advisory
- https://www.samba.org/samba/security/CVE-2018-16841.htmlPatch, Vendor Advisory
- http://www.securityfocus.com/bid/106023Third Party Advisory, VDB Entry
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16841Issue Tracking, Third Party Advisory
- https://security.gentoo.org/glsa/202003-52Third Party Advisory
- https://security.netapp.com/advisory/ntap-20181127-0001/Third Party Advisory
- https://usn.ubuntu.com/3827-1/Third Party Advisory
- https://usn.ubuntu.com/3827-2/Third Party Advisory
- https://www.debian.org/security/2018/dsa-4345Third Party Advisory
- https://www.samba.org/samba/security/CVE-2018-16841.htmlPatch, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.