kernel: netfilter connection tracking extensions denial of service
Published May 27, 2015
4.9
MEDIUMCVSS 2.0
EPSS 0.40%
Description
include/net/netfilter/nf_conntrack_extend.h in the netfilter subsystem in the Linux kernel before 3.14.5 uses an insufficiently large data type for certain extension data, which allows local users to cause a denial of service (NULL pointer dereference and OOPS) via outbound network traffic that triggers extension loading, as demonstrated by configuring a PPTP tunnel in a NAT environment.
Affected products
No data.
- ≤ 3.14.4
No data.
Red Hat Enterprise Linux 7
kernel-0:3.10.0-229.11.1.ael7b
Fixed · RHSA-2015:1534
Red Hat Enterprise Linux 7
kernel-rt-0:3.10.0-229.11.1.rt56.141.11.el7_1
Fixed · RHSA-2015:1565
Red Hat Enterprise MRG 2
kernel-rt-1:3.10.0-229.rt56.158.el6rt
Fixed · RHSA-2015:1564
Red Hat Enterprise Linux 5
kernel
Not affected
Red Hat Enterprise Linux 6
kernel
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 7 | kernel-0:3.10.0-229.11.1.ael7b | Fixed | RHSA-2015:1534 |
| Red Hat Enterprise Linux 7 | kernel-rt-0:3.10.0-229.11.1.rt56.141.11.el7_1 | Fixed | RHSA-2015:1565 |
| Red Hat Enterprise MRG 2 | kernel-rt-1:3.10.0-229.rt56.158.el6rt | Fixed | RHSA-2015:1564 |
| Red Hat Enterprise Linux 5 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 6 | kernel | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue does not affect the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 5 and 6. This issue affects the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 7 and Red Hat Enterprise MRG 2. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata/.
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:L/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 (9 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.40% (0.00396) | 31.34th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.39% (0.00392) | 30.78th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.09% (0.00089) | 23.31th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.04% (0.00042) | 5.07th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.04% (0.00042) | 5.63th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.28% (0.01282) | 68.34th | v2 (v2022.01.01) |
| Feb 22, 2023 | 1.28% (0.01282) | 68.05th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.28% (0.01282) | 65.91th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.28% (0.01282) | 41.72th | v2 (v2022.01.01) |
References (15)
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=223b02d923ecd7c84cf9780bb3686f455d279279 x_refsource_CONFIRM
- http://marc.info/?l=netfilter-devel&m=140112364215200&w=2 mailing-listx_refsource_MLIST
- http://rhn.redhat.com/errata/RHSA-2015-1534.html vendor-advisoryx_refsource_REDHAT
- http://rhn.redhat.com/errata/RHSA-2015-1564.html vendor-advisoryx_refsource_REDHAT
- http://www.debian.org/security/2015/dsa-3237 vendor-advisoryx_refsource_DEBIAN
- http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.14.5 x_refsource_CONFIRM
- http://www.openwall.com/lists/oss-security/2015/04/08/1 mailing-listx_refsource_MLIST
- http://www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.html x_refsource_CONFIRM
- http://www.securityfocus.com/bid/73953 vdb-entryx_refsource_BID
- http://www.securitytracker.com/id/1032415 vdb-entryx_refsource_SECTRACK
- https://access.redhat.com/security/cve/CVE-2014-9715 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1208684 x_refsource_CONFIRMIssue Tracking
- https://github.com/torvalds/linux/commit/223b02d923ecd7c84cf9780bb3686f455d279279 x_refsource_CONFIRM
- https://nvd.nist.gov/vuln/detail/CVE-2014-9715
- https://www.cve.org/CVERecord?id=CVE-2014-9715
Change history (0)
No recorded changes yet.