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Fencer Intel
medium 6.5

CVE-2011-3363 json

The setup_cifs_sb function in fs/cifs/connect.c in the Linux kernel before 2.6.39 does not properly handle DFS referrals, which allows remo…

published 2012-05-24 14 y ago modified 2026-06-16 4 mo ago also EUVD-2011-3327

cvss
6.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.8%
EPSS 0.8% chance of exploitation in 30 days, percentile 57%
public exploits
0
none known

Summary

The setup_cifs_sb function in fs/cifs/connect.c in the Linux kernel before 2.6.39 does not properly handle DFS referrals, which allows remote CIFS servers to cause a denial of service (system crash) by placing a referral at the root of a share.

Patch / fix

  • linux linux_kernel 2.6.39
  • kernel RHEL 5 2.6.18-274.12.1.el5
  • kernel-PAE RHEL 5 2.6.18-274.12.1.el5
  • kernel-xen RHEL 5 2.6.18-274.12.1.el5
  • kernel-kdump RHEL 5 2.6.18-274.12.1.el5
  • kernel-debuginfo-common RHEL 5 2.6.18-274.12.1.el5
  • kernel RHEL 6 2.6.32-131.21.1.el6
  • perf RHEL 6 2.6.32-131.21.1.el6
  • kernel-kdump RHEL 6 2.6.32-131.21.1.el6

red hat advisories RHSA-2011:1479RHSA-2011:1465RHSA-2012:0010

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-2011-3363 updated cvss 4.6

kernel: cifs: always do is_path_accessible check in cifs_mount

  • Red Hat Enterprise Linux 4 kernel
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux (v. 5 server) kernel 2.6.18-274.12.1.el5, kernel-PAE 2.6.18-274.12.1.el5, kernel-xen 2.6.18-274.12.1.el5, kernel-kdump 2.6.18-274.12.1.el5, kernel-debuginfo-common 2.6.18-274.12.1.el5 Red Hat Enterprise Linux Desktop (v. 5 client) kernel 2.6.18-274.12.1.el5, kernel-PAE 2.6.18-274.12.1.el5, kernel-xen 2.6.18-274.12.1.el5, kernel-debuginfo-common 2.6.18-274.12.1.el5
    fixed: vendor fix RHSA-2011:1479
  • Red Hat Enterprise Linux Server (v. 6) perf 2.6.32-131.21.1.el6, kernel 2.6.32-131.21.1.el6, kernel-kdump 2.6.32-131.21.1.el6, kernel-firmware 2.6.32-131.21.1.el6, kernel-bootwrapper 2.6.32-131.21.1.el6, kernel-debuginfo-common-i686 2.6.32-131.21.1.el6, +3 more
    fixed: vendor fix RHSA-2011:1465
  • Red Hat MRG Realtime for RHEL 6 Server v.2 kernel-rt 2.6.33.9-rt31.79.el6rt, kernel-rt-trace 2.6.33.9-rt31.79.el6rt, kernel-rt-vanilla 2.6.33.9-rt31.79.el6rt, kernel-rt-firmware 2.6.33.9-rt31.79.el6rt, kernel-rt-debuginfo-common-x86_64 2.6.33.9-rt31.79.el6rt
    fixed: vendor fix RHSA-2012:0010

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

0.83% chance of exploitation in the next 30 days, higher than 57% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 6.5 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 6.1 AV:A/AC:L/Au:N/C:N/I:N/A:C

Classification

Weakness
  • CWE-20 Improper Input Validation
Technology feeds

References

Sources

Fencer Intel 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.