Description
The ndisc_router_discovery function in net/ipv6/ndisc.c in the Neighbor Discovery (ND) protocol implementation in the IPv6 stack in the Linux kernel before 3.19.6 allows remote attackers to reconfigure a hop-limit setting via a small hop_limit value in a Router Advertisement (RA) message.
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 | 3.16.7-ckt9-1 | — |
| Debian 13 | linux | 3.16.7-ckt9-1 | — |
| Debian 12 | linux | 3.16.7-ckt9-1 | — |
| Debian 8 | linux | 3.16.7-ckt9-3~deb8u1 | DSA-3237-1 |
| Debian 7 | linux | 3.2.68-1+deb7u1 | DSA-3237-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 6.0 | linux-2.6 | 2.6.32-48squeeze12 | DLA-246-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | linux-riscv +6 | No fix yet | — |
| Ubuntu 22.04 LTS | linux-riscv +2 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-gke +4 | No fix yet | — |
| Ubuntu 18.04 LTS | linux-gcp +3 | No fix yet | — |
| Ubuntu 14.04 LTS | linux | 3.13.0-51.84 | USN-2588-1 |
| Ubuntu 14.04 LTS | linux-lts-utopic | 3.16.0-36.48~14.04.1 | USN-2589-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | linux-azure-fde-5.15 | No fix yet | — |
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 |
| RHEL 6 | perf +16 | 2.6.32-504.30.3.el6 | RHSA-2015:1221 |
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 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 | kernel-docs +1 | 3.12.43-52.6.2 | SUSE-SU-2015:1071-1 |
| SLES 12 | kernel-ec2 +4 | 3.12.43-52.6.1 | SUSE-SU-2015:1071-1 |
| SLES 11 SP3 | kernel-xen +4 | 3.0.101-0.63.TDC.1 | SUSE-SU-2015:1224-1 |
| SLES 11 SP2 | kernel-ec2 +6 | 3.0.101-0.7.37.1 | SUSE-SU-2015:1478-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 | kernel-xen +3 | 3.12.43-52.6.1 | SUSE-SU-2015:1071-1 |
| SLE Live Patching 12 | kgraft-patch-SLE12_Update_5 | 1-2.3 | SUSE-SU-2015:1071-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | dtrace-modules-3.8.13-68.3.4.el6uek | 0.4.3-4.el6 | ELSA-2015-3048 |
| Oracle Linux 7 | dtrace-modules-3.8.13-68.3.4.el7uek | 0.4.3-4.el7 | ELSA-2015-3048 |
| Oracle Linux 7 | kernel-uek +5 | 3.8.13-68.3.4.el7uek | ELSA-2015-3048 |
| Oracle Linux 7 | perf +11 | 3.10.0-229.11.1.el7 | ELSA-2015-1534 |
Advisories 13
- RHSA-2015:1565 Red Hat Security Advisory: kernel-rt security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2015:1564 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
- RHSA-2015:1221 Red Hat Security Advisory: kernel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- USN-2588-1 linux vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DLA-246-1 linux-2.6 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-3237-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- USN-2589-1 linux-lts-utopic vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- SUSE-SU-2015:1478-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2015:1071-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2015:1224-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- ELSA-2015-1534 Moderate: kernel security and bug fix update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Aug 5, 2015
- ELSA-2015-3048 Moderate: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jul 15, 2015
References
- FEDORA-2015-6100 vendor-advisory
- FEDORA-2015-6294 vendor-advisory
- http://www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.html
- DSA-3237 vendor-advisory
- openSUSE-SU-2015:1382 vendor-advisory
- FEDORA-2015-6320 vendor-advisory
- 1032417 vdb-entry
- http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.19.6
- SUSE-SU-2015:1478 vendor-advisory
- [oss-security] 20150404 Re: CVE Request : IPv6 Hop limit lowering via RA messages mailing-list
- https://bugzilla.redhat.com/show_bug.cgi?id=1203712
- RHSA-2015:1534 vendor-advisory
- RHSA-2015:1564 vendor-advisory
- https://github.com/torvalds/linux/commit/6fd99094de2b83d1d4c8457f2c83483b2828e75a
- SUSE-SU-2015:1224 vendor-advisory
- 74315 vdb-entry
- RHSA-2015:1221 vendor-advisory
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=6fd99094de2b83d1d4c8457f2c83483b2828e75a
- http://www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.html