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TI-2018-12061 Aliases CVE-2018-16851GHSA-48v5-hp4g-w2rv

NULL pointer dereference in [UNKNOWN] samba

Priority LOW 35CWE-476Published · 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-476.

Summary

Samba from version 4.0.0 and before versions 4.7.12, 4.8.7, 4.9.3 is vulnerable to a denial of service. During the processing of an LDAP search before Samba's AD DC returns the LDAP entries to the client, the entries are cached in a single memory object with a maximum size of 256MB. When this size is reached, the Samba process providing the LDAP service will follow the NULL pointer, terminating the process. There is no further vulnerability associated with this issue, merely a denial of service.

Why it matters now

EPSS 0.03251 88th 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 · 8

CPEVersionsRoleVendor
cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*4.0.0 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:8.0:*:*:*:*:*:*:*8.0VulnerableDebian
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*9.0VulnerableDebian
  • cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:* Versions 4.0.0 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:8.0:*:*:*:*:*:*:* Versions 8.0 Vulnerable ·Debian
  • 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-2018-12051 Use after free in [UNKNOWN] sambaPriority LOW 36
    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-2018-12051 Use after free in [UNKNOWN] sambaPriority LOW 36
    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-2018-12051 Use after free in [UNKNOWN] sambaPriority LOW 36
    Show all 3 records → Advisory →

Vendor assessments

Red Hat

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

Not affected: 6 products
  • Red Hat Enterprise Linux 5
  • 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-2018-16851
  2. 2026-10-03 Alias added: GHSA-48v5-hp4g-w2rv

References

Patch 1

Advisory 7

Sources

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