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Fencer Vulns
medium 6.5

CVE-2017-9461 json

smbd in Samba before 4.4.10 and 4.5.x before 4.5.6 has a denial of service vulnerability (fd_open_atomic infinite loop with high CPU usage…

published 2017-06-06 9 y ago modified 2026-06-17 4 mo ago also EUVD-2017-18394

cvss
6.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
4.2%
EPSS 4.2% chance of exploitation in 30 days, percentile 91%
public exploits
0
none known

Summary

smbd in Samba before 4.4.10 and 4.5.x before 4.5.6 has a denial of service vulnerability (fd_open_atomic infinite loop with high CPU usage and memory consumption) due to wrongly handling dangling symlinks.

Patch / fix

  • samba Debian 14, Debian 13, Debian 12 2:4.5.6+dfsg-1

debian advisories DEBIAN-CVE-2017-9461

  • samba Ubuntu 14.04 LTS 2:4.3.11+dfsg-0ubuntu0.14.04.9
  • samba Ubuntu 16.04 LTS 2:4.3.11+dfsg-0ubuntu0.16.04.8

ubuntu advisories UBUNTU-CVE-2017-9461

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • samba storage 3.2 4.6.3-4.el7rhgs
  • ctdb storage 3.2 4.6.3-4.el7rhgs
  • samba-dc storage 3.2 4.6.3-4.el7rhgs
  • ctdb-tests storage 3.2 4.6.3-4.el7rhgs
  • samba-libs storage 3.2 4.6.3-4.el7rhgs
  • samba-pidl storage 3.2 4.6.3-4.el7rhgs
  • samba-test storage 3.2 4.6.3-4.el7rhgs
  • libwbclient storage 3.2 4.6.3-4.el7rhgs

red hat advisories RHSA-2017:2338RHSA-2017:2778RHSA-2017:1950

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2017-9461 updated cvss 6.5

samba: fd_open_atomic infinite loop due to wrong handling of dangling symlinks

  • Red Hat Enterprise Linux 6 samba4, samba4-dc, samba4-libs, samba4-pidl, samba4-swat, samba4-test, +7 more
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux Client (v. 7) samba 4.6.2-8.el7, samba-libs 4.6.2-8.el7, libwbclient 4.6.2-8.el7, libsmbclient 4.6.2-8.el7, samba-client 4.6.2-8.el7, samba-common 4.6.2-8.el7, +7 more Red Hat Enterprise Linux Client Optional (v. 7) samba 4.6.2-8.el7, samba-dc 4.6.2-8.el7, samba-pidl 4.6.2-8.el7, samba-test 4.6.2-8.el7, samba-python 4.6.2-8.el7, samba-dc-libs 4.6.2-8.el7, +3 more Red Hat Enterprise Linux ComputeNode (v. 7) samba 4.6.2-8.el7, samba-libs 4.6.2-8.el7, libwbclient 4.6.2-8.el7, libsmbclient 4.6.2-8.el7, samba-client 4.6.2-8.el7, samba-common 4.6.2-8.el7, +6 more Red Hat Enterprise Linux ComputeNode Optional (v. 7) samba 4.6.2-8.el7, samba-dc 4.6.2-8.el7, samba-pidl 4.6.2-8.el7, samba-test 4.6.2-8.el7, samba-python 4.6.2-8.el7, samba-dc-libs 4.6.2-8.el7, +4 more Red Hat Enterprise Linux Server (v. 7) samba 4.6.2-8.el7, samba-libs 4.6.2-8.el7, libwbclient 4.6.2-8.el7, libsmbclient 4.6.2-8.el7, samba-client 4.6.2-8.el7, samba-common 4.6.2-8.el7, +8 more Red Hat Enterprise Linux Server Optional (v. 7) samba-dc 4.6.2-8.el7, samba-pidl 4.6.2-8.el7, samba-test 4.6.2-8.el7, samba-python 4.6.2-8.el7, samba-dc-libs 4.6.2-8.el7, samba-test-libs 4.6.2-8.el7, +2 more
    +3 more products
    Red Hat Enterprise Linux Server Resilient Storage (v. 7) ctdb 4.6.2-8.el7, ctdb-tests 4.6.2-8.el7 Red Hat Enterprise Linux Workstation (v. 7) samba 4.6.2-8.el7, samba-libs 4.6.2-8.el7, libwbclient 4.6.2-8.el7, libsmbclient 4.6.2-8.el7, samba-client 4.6.2-8.el7, samba-common 4.6.2-8.el7, +8 more Red Hat Enterprise Linux Workstation Optional (v. 7) samba-dc 4.6.2-8.el7, samba-pidl 4.6.2-8.el7, samba-test 4.6.2-8.el7, samba-dc-libs 4.6.2-8.el7, samba-test-libs 4.6.2-8.el7, samba-vfs-glusterfs 4.6.2-8.el7, +1 more
    fixed: vendor fix RHSA-2017:1950
  • Red Hat Gluster 3.2 Samba on RHEL-7 ctdb 4.6.3-4.el7rhgs, samba 4.6.3-4.el7rhgs, samba-dc 4.6.3-4.el7rhgs, ctdb-tests 4.6.3-4.el7rhgs, samba-libs 4.6.3-4.el7rhgs, samba-pidl 4.6.3-4.el7rhgs, +17 more
    fixed: vendor fix RHSA-2017:2338
  • Red Hat Gluster 3.3 Samba on RHEL-6 ctdb 4.6.3-5.el6rhs, samba 4.6.3-5.el6rhs, pyldb 1.1.29-1.el6rhs, libldb 1.1.29-1.el6rhs, pytalloc 2.1.9-1.el6rhs, samba-dc 4.6.3-5.el6rhs, +27 more
    fixed: vendor fix RHSA-2017:2778
  • Red Hat Enterprise Linux 5 samba, samba3x Red Hat Enterprise Linux 6 samba, samba-swat, libsmbclient, samba-client, samba-common, samba-winbind, +4 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

4.23% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • bugzilla.samba.org https://bugzilla.samba.org/show_bug.cgi?id=12572 referenced PoC, tagged "exploit" by a source, unverified
  • bugs.debian.org https://bugs.debian.org/864291 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.0 6.5 CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 6.8 AV:N/AC:L/Au:S/C:N/I:N/A:C

Classification

Weakness
  • CWE-835 Loop with Unreachable Exit Condition

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.