kernel: cifs: off-by-one bug in build_unc_path_to_root
Published Aug 25, 2013
7.8
HIGHCVSS 2.0
EPSS 3.64%
Description
Off-by-one error in the build_unc_path_to_root function in fs/cifs/connect.c in the Linux kernel before 3.9.6 allows remote attackers to cause a denial of service (memory corruption and system crash) via a DFS share mount operation that triggers use of an unexpected DFS referral name length.
Affected products
No data.
- ≥ 3.8 · < 3.9.6
No data.
Red Hat Enterprise Linux 5
kernel
Not affected
Red Hat Enterprise Linux 6
kernel
Not affected
Red Hat Enterprise Linux 7
kernel
Not affected
Red Hat Enterprise MRG 2
realtime-kernel
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 6 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 7 | kernel | Not affected | n/a |
| Red Hat Enterprise MRG 2 | realtime-kernel | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue does not affect the versions of the kernel package as shipped with Red Hat Enterprise Linux 5, 6 and Red Hat Enterprise MRG 2.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
AV:N/AC:L/Au:N/C:N/I:N/A:C
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 (13 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 3.64% (0.03644) | 89.22th | v5 (v2026.06.15) |
| Jun 15, 2026 | 3.64% (0.03644) | 88.09th | v5 (v2026.06.15) |
| Mar 30, 2025 | 1.23% (0.01234) | 77.34th | v4 (v2025.03.14) |
| Mar 29, 2025 | 4.50% (0.04496) | 81.50th | v4 (v2025.03.14) |
| Mar 17, 2025 | 1.23% (0.01234) | 77.81th | v4 (v2025.03.14) |
| Dec 12, 2024 | 1.54% (0.01540) | 87.63th | v3 (v2023.03.01) |
| Jun 7, 2024 | 1.54% (0.01540) | 87.13th | v3 (v2023.03.01) |
| May 8, 2023 | 1.54% (0.01540) | 85.13th | v3 (v2023.03.01) |
| Mar 7, 2023 | 1.19% (0.01188) | 82.90th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.21% (0.01213) | 66.61th | v2 (v2022.01.01) |
| Feb 17, 2023 | 1.21% (0.01213) | 66.22th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.21% (0.01213) | 64.21th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.21% (0.01213) | 40.54th | v2 (v2022.01.01) |
References (8)
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=1fc29bacedeabb278080e31bb9c1ecb49f143c3b x_refsource_CONFIRM
- http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.9.6 x_refsource_CONFIRMVendor Advisory
- http://www.openwall.com/lists/oss-security/2013/08/14/10 mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2013-4247 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=998401 x_refsource_CONFIRMIssue TrackingThird Party Advisory
- https://github.com/torvalds/linux/commit/1fc29bacedeabb278080e31bb9c1ecb49f143c3b x_refsource_CONFIRMExploitPatchThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2013-4247
- https://www.cve.org/CVERecord?id=CVE-2013-4247
| Link | Providers | Tags |
|---|---|---|
| http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=1fc29bacedeabb278080e31bb9c1ecb49f143c3b | x_refsource_CONFIRM | |
| http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.9.6 | x_refsource_CONFIRMVendor Advisory | |
| http://www.openwall.com/lists/oss-security/2013/08/14/10 | mailing-listx_refsource_MLISTMailing ListThird Party Advisory | |
| https://access.redhat.com/security/cve/CVE-2013-4247 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=998401 | x_refsource_CONFIRMIssue TrackingThird Party Advisory | |
| https://github.com/torvalds/linux/commit/1fc29bacedeabb278080e31bb9c1ecb49f143c3b | x_refsource_CONFIRMExploitPatchThird Party Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2013-4247 | ||
| https://www.cve.org/CVERecord?id=CVE-2013-4247 |
Change history (0)
No recorded changes yet.