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.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | linux | 3.14.5-1 | — |
| Debian 13 | linux | 3.14.5-1 | — |
| Debian 12 | linux | 3.14.5-1 | — |
| Debian 8 | linux | 3.16.7-ckt9-3~deb8u1 | DSA-3237-1 |
| Debian 7 | linux | 3.2.68-1+deb7u1 | DSA-3237-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | linux | 3.13.0-53.88 | USN-2614-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | kernel-kdump +4 | 3.10.0-229.11.1.el7 | RHSA-2015:1534 |
| RHEL 7 | kernel-rt +7 | 3.10.0-229.11.1.rt56.141.11.el7_1 | RHSA-2015:1565 |
| RHEL 7 | perf +13 | 3.10.0-229.11.1.ael7b | RHSA-2015:1534 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat MRG 2 | kernel-rt +10 | 1:3.10.0-229.rt56.158.el6rt | RHSA-2015:1564 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | perf +11 | 3.10.0-229.11.1.el7 | ELSA-2015-1534 |
Advisories 6
- RHSA-2015:1564 Red Hat Security Advisory: kernel-rt security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2015:1565 Red Hat Security Advisory: kernel-rt security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2015:1534 Red Hat Security Advisory: kernel security and bug fix update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- USN-2614-1 linux vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-3237-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- ELSA-2015-1534 Moderate: kernel security and bug fix update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Aug 5, 2015
References
- 73953 vdb-entry
- https://github.com/torvalds/linux/commit/223b02d923ecd7c84cf9780bb3686f455d279279
- http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.14.5
- [netfilter-devel] 20140526 OOPS NULL pointer dereference in nf_nat_setup_info+0x471 (reproductible, 3.14.4) mailing-list
- http://www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.html
- [oss-security] 20150407 CVE request netfilter connection tracking accounting. mailing-list
- DSA-3237 vendor-advisory
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=223b02d923ecd7c84cf9780bb3686f455d279279
- 1032415 vdb-entry
- RHSA-2015:1534 vendor-advisory
- RHSA-2015:1564 vendor-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1208684