kernel: cifs oops when creating file with O_DIRECT set
Published Sep 6, 2011
7.8
HIGHCVSS 3.1
EPSS 0.52%
Description
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.
Affected products
No data.
- < 2.6.39
No data.
Red Hat Enterprise Linux 6
kernel-0:2.6.32-131.2.1.el6
Fixed · RHSA-2011:0836
Red Hat Enterprise Linux 4
kernel
Not affected
Red Hat Enterprise Linux 5
kernel
Not affected
Red Hat Enterprise MRG 1
kernel-rt
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 6 | kernel-0:2.6.32-131.2.1.el6 | Fixed | RHSA-2011:0836 |
| Red Hat Enterprise Linux 4 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 5 | kernel | Not affected | n/a |
| Red Hat Enterprise MRG 1 | kernel-rt | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue did not affect the Linux kernel as shipped with Red Hat Enterprise Linux 4, 5, and Red Hat Enterprise Linux MRG as they did not backport the upstream commit cdff08e7 that introduced this issue. Future kernel updates for Red Hat Enterprise Linux 6 may address this flaw.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
No CVSS v3.0 score for this CVE.
AV:L/AC:M/Au:N/C:P/I:P/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (12 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.52% (0.00516) | 41.74th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.52% (0.00516) | 39.55th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.11% (0.00107) | 26.41th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.04% (0.00043) | 11.63th | v3 (v2023.03.01) |
| Jun 20, 2024 | 0.04% (0.00043) | 9.83th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.04% (0.00043) | 7.83th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.03% (0.01034) | 41.69th | v2 (v2022.01.01) |
| Feb 13, 2023 | 1.03% (0.01034) | 41.16th | v2 (v2022.01.01) |
| Feb 3, 2023 | 1.28% (0.01282) | 67.60th | v2 (v2022.01.01) |
| Sep 10, 2022 | 1.03% (0.01034) | 39.91th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.03% (0.01034) | 37.91th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.03% (0.01034) | 20.32th | v2 (v2022.01.01) |
References (10)
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=7797069305d13252fd66cf722aa8f2cbeb3c95cd x_refsource_CONFIRM
- http://marc.info/?l=linux-cifs&m=130204357001849&w=2 mailing-listx_refsource_MLISTExploitThird Party Advisory
- http://marc.info/?l=linux-cifs&m=130204730006155&w=2 mailing-listx_refsource_MLISTThird Party Advisory
- http://securityreason.com/securityalert/8367 third-party-advisoryx_refsource_SREASONThird Party Advisory
- http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.39 x_refsource_CONFIRMRelease NotesVendor Advisory
- http://www.openwall.com/lists/oss-security/2011/05/09/2 mailing-listx_refsource_MLISTExploitMailing ListPatchThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2011-1771 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=703016 x_refsource_CONFIRMExploitIssue TrackingPatchThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2011-1771
- https://www.cve.org/CVERecord?id=CVE-2011-1771
| Link | Providers | Tags |
|---|---|---|
| http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=7797069305d13252fd66cf722aa8f2cbeb3c95cd | x_refsource_CONFIRM | |
| http://marc.info/?l=linux-cifs&m=130204357001849&w=2 | mailing-listx_refsource_MLISTExploitThird Party Advisory | |
| http://marc.info/?l=linux-cifs&m=130204730006155&w=2 | mailing-listx_refsource_MLISTThird Party Advisory | |
| http://securityreason.com/securityalert/8367 | third-party-advisoryx_refsource_SREASONThird Party Advisory | |
| http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.39 | x_refsource_CONFIRMRelease NotesVendor Advisory | |
| http://www.openwall.com/lists/oss-security/2011/05/09/2 | mailing-listx_refsource_MLISTExploitMailing ListPatchThird Party Advisory | |
| https://access.redhat.com/security/cve/CVE-2011-1771 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=703016 | x_refsource_CONFIRMExploitIssue TrackingPatchThird Party Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2011-1771 | ||
| https://www.cve.org/CVERecord?id=CVE-2011-1771 |
Change history (0)
No recorded changes yet.