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Fencer Intel
high 7.8

CVE-2011-1771 json

The cifs_close function in fs/cifs/file.c in the Linux kernel before 2.6.39 allows local users to cause a denial of service (NULL pointer d…

published 2011-09-06 15 y ago modified 2026-06-16 4 mo ago also EUVD-2011-1770

cvss
7.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 44%
public exploits
0
none known

Summary

The cifs_close function in fs/cifs/file.c in the Linux kernel before 2.6.39 allows local users to cause a denial of service (NULL pointer dereference and BUG) or possibly have unspecified other impact by setting the O_DIRECT flag during an attempt to open a file on a CIFS filesystem.

Patch / fix

  • linux linux_kernel 2.6.39
  • kernel RHEL 6 2.6.32-131.2.1.el6
  • perf RHEL 6 2.6.32-131.2.1.el6
  • kernel-kdump RHEL 6 2.6.32-131.2.1.el6
  • kernel-firmware RHEL 6 2.6.32-131.2.1.el6
  • kernel-bootwrapper RHEL 6 2.6.32-131.2.1.el6
  • kernel-debuginfo-common-i686 RHEL 6 2.6.32-131.2.1.el6
  • kernel-debuginfo-common-ppc64 RHEL 6 2.6.32-131.2.1.el6
  • kernel-debuginfo-common-s390x RHEL 6 2.6.32-131.2.1.el6

red hat advisories RHSA-2011:0836

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-2011-1771 updated cvss 4.7

kernel: cifs oops when creating file with O_DIRECT set

  • Red Hat Enterprise Linux Server (v. 6) perf 2.6.32-131.2.1.el6, kernel 2.6.32-131.2.1.el6, kernel-kdump 2.6.32-131.2.1.el6, kernel-firmware 2.6.32-131.2.1.el6, kernel-bootwrapper 2.6.32-131.2.1.el6, kernel-debuginfo-common-i686 2.6.32-131.2.1.el6, +3 more
    fixed: vendor fix RHSA-2011:0836
  • Red Hat Enterprise Linux 4 kernel Red Hat Enterprise Linux 5 kernel Red Hat Enterprise MRG 1 kernel-rt
    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

0.52% chance of exploitation in the next 30 days, higher than 44% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • openwall.com http://www.openwall.com/lists/oss-security/2011/05/09/2 referenced PoC, tagged "exploit" by a source, unverified
  • bugzilla.redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=703016 referenced PoC, tagged "exploit" by a source, unverified
  • marc.info http://marc.info/?l=linux-cifs&m=130204357001849&w=2 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 4.4 AV:L/AC:M/Au:N/C:P/I:P/A:P

Classification

Weakness
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.