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TI-2018-12051 Aliases CVE-2018-16841GHSA-q3v8-mj9m-2wq4

Use after free in [UNKNOWN] samba

Priority LOW 36CWE-416Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-416 and the CVSS impact.

Summary

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.

Why it matters now

EPSS 0.04586 91st percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
[UNKNOWN]samba4.7.12; 4.8.7; 4.9.3—No fix listedCNA
  • samba Vendor[UNKNOWN] Affected 4.7.12; 4.8.7; 4.9.3 Fixed in — No fix listed CNA

CPE configurations NVD · 7

CPEVersionsRoleVendor
cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*4.3.0 to before 4.7.12; 4.8.0 to before 4.8.7; 4.9.0 to before 4.9.3VulnerableSamba
cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:esm:*:*:*12.04VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*14.04VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*16.04VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*18.04VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:*18.10VulnerableCanonical
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*9.0VulnerableDebian
  • cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:* Versions 4.3.0 to before 4.7.12; 4.8.0 to before 4.8.7; 4.9.0 to before 4.9.3 Vulnerable ·Samba
  • cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:esm:*:*:* Versions 12.04 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:* Versions 14.04 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:* Versions 16.04 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* Versions 18.04 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:* Versions 18.10 Vulnerable ·Canonical
  • cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Debian

Remediation

No fixed version listed by the sources yet.

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Advisory ·

    [UNKNOWN] samba — USN-3827-1

    3 records Highest priority Priority LOW 3 LOW

    Other records, highest priority first

    • TI-2018-10494 Uncontrolled resource consumption in [UNKNOWN] sambaPriority LOW 37
    • TI-2018-12061 NULL pointer dereference in [UNKNOWN] sambaPriority LOW 35
    Show all 3 records → Advisory →
  • Advisory ·

    [UNKNOWN] samba — USN-3827-2

    3 records Highest priority Priority LOW 3 LOW

    Other records, highest priority first

    • TI-2018-10494 Uncontrolled resource consumption in [UNKNOWN] sambaPriority LOW 37
    • TI-2018-12061 NULL pointer dereference in [UNKNOWN] sambaPriority LOW 35
    Show all 3 records → Advisory →
Show 1 more group
  • Advisory ·

    [UNKNOWN] samba — DSA-4345

    3 records Highest priority Priority LOW 3 LOW

    Other records, highest priority first

    • TI-2018-10494 Uncontrolled resource consumption in [UNKNOWN] sambaPriority LOW 37
    • TI-2018-12061 NULL pointer dereference in [UNKNOWN] sambaPriority LOW 35
    Show all 3 records → Advisory →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Not affected: 5 products
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat Storage 3
  • Red Hat Virtualization 4

Timeline

  1. 2026-10-02 Threatist record created from CVE-2018-16841
  2. 2026-10-03 Alias added: GHSA-q3v8-mj9m-2wq4

References

Patch 1

Advisory 6

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences