What is CVE-2009-2906?

CVE-2009-2906 is a vulnerability in Samba, classified under Loop with Unreachable Exit Condition (Infinite Loop). Published 2009-10-07.

Is CVE-2009-2906 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Samba

CVE-2009-2906

smbd in Samba 3.0 before 3.0.37, 3.2 before 3.2.15, 3.3 before 3.3.8, and 3.4 before 3.4.2 allows remote authenticated users to cause a denial of service (infinite loop) via an unanticipated oplock break notification reply packet.

Published 2009-10-07 · last modified 2026-06-16.

CVSS v2 metric

CVSS v2 base score 4.0 (Medium). Vector: AV:N/AC:L/Au:S/C:N/I:N/A:P. This CVE predates CVSS v3 and has no v3 score from NVD.

EPSS exploit prediction

EPSS: 0.042 (90.6th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 91st percentile — 90.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.042 · newest: 0.042 · change: 0.000

Affected products

Samba — versions 3.4.0, 3.4.1
Canonical Ubuntu Linux — versions 6.06, 8.04, 8.10

Weakness classification (CWE)

CWE-835 — Loop with Unreachable Exit Condition (Infinite Loop)

Public proof-of-concept exploits

Live-Hack-CVE/CVE-2009-2906

References

samba.org/samba/security/CVE-2009-2906.html (Vendor Advisory)
news.samba.org/releases/3.4.2/ (Vendor Advisory)
www.securityfocus.com/archive/1/507856/100/0/threaded (mailing-list, VDB Entry, Third Party Advisory)
oval.cisecurity.org/repository/search/definition/oval:org.mitre.oval:def:9944 (signature, Third Party Advisory, vdb-entry)
www.redhat.com/archives/fedora-package-announce/2009-October/msg00098.html (vendor-advisory, Patch, Third Party Advisory)
lists.apple.com/archives/security-announce/2010//Mar/msg00001.html (vendor-advisory, Mailing List, Third Party Advisory)
news.samba.org/releases/3.2.15/ (Vendor Advisory)
sunsolve.sun.com/search/document.do (vendor-advisory, Broken Link)
osvdb.org/58519 (vdb-entry, Broken Link)
www.vupen.com/english/advisories/2009/2810 (Patch, Third Party Advisory, vdb-entry)

Frequently asked questions

What is CVE-2009-2906?: CVE-2009-2906 is a vulnerability in Samba, classified under Loop with Unreachable Exit Condition (Infinite Loop). Published 2009-10-07.
Is CVE-2009-2906 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.