Description
The ip_cmsg_recv_checksum function in net/ipv4/ip_sockglue.c in the Linux kernel before 4.10.1 has incorrect expectations about skb data layout, which allows local users to cause a denial of service (buffer over-read) or possibly have unspecified other impact via crafted system calls, as demonstrated by use of the MSG_MORE flag in conjunction with loopback UDP transmission.
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 | 4.9.13-1 | — |
| Debian 13 | linux | 4.9.13-1 | — |
| Debian 12 | linux | 4.9.13-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | linux-raspi-realtime | No fix yet | — |
| Ubuntu 22.04 LTS | linux-riscv +2 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-gke +3 | No fix yet | — |
| Ubuntu 18.04 LTS | linux-gcp +4 | No fix yet | — |
| Ubuntu 16.04 LTS | linux | 4.4.0-75.96 | USN-3265-1 |
| Ubuntu 16.04 LTS | linux-aws | 4.4.0-1016.25 | USN-3265-1 |
| Ubuntu 16.04 LTS | linux-gke | 4.4.0-1012.12 | USN-3265-1 |
| Ubuntu 16.04 LTS | linux-hwe | 4.10.0-32.36~16.04.1 | USN-3361-1 |
| Ubuntu 16.04 LTS | linux-raspi2 | 4.4.0-1054.61 | USN-3265-1 |
| Ubuntu 16.04 LTS | linux-snapdragon | 4.4.0-1057.61 | USN-3265-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | linux-lts-xenial | 4.4.0-75.96~14.04.1 | USN-3265-2 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP2 | kernel-default +1 | 4.4.59-92.17.3 | SUSE-SU-2017:1183-1 |
| SLES 12 SP2 | kernel-docs | 4.4.59-92.17.8 | SUSE-SU-2017:1183-1 |
| SLES 12 SP2 | kernel-syms +1 | 4.4.59-92.17.2 | SUSE-SU-2017:1183-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP2 | kernel-default | 4.4.59-92.17.3 | SUSE-SU-2017:1183-1 |
| SLES for SAP 12 SP2 | kernel-syms +1 | 4.4.59-92.17.2 | SUSE-SU-2017:1183-1 |
| SLE Real Time 12 SP2 | kernel-rt +3 | 4.4.74-7.10.1 | SUSE-SU-2017:1990-1 |
| SLE Live Patching 12 | kgraft-patch-SLE12-SP2_Update_7 | 1-2.3 | SUSE-SU-2017:1183-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | dtrace-modules-4.1.12-61.1.34.el6uek | 0.5.3-2.el6 | ELSA-2017-3539 |
| Oracle Linux 7 | dtrace-modules-4.1.12-61.1.34.el7uek | 0.5.3-2.el7 | ELSA-2017-3539 |
| Oracle Linux 7 | kernel-uek +5 | 4.1.12-61.1.34.el7uek | ELSA-2017-3539 |
Advisories 6
- USN-3361-1 linux-hwe vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- USN-3265-1 linux, linux-aws, linux-gke, linux-raspi2, linux-snapdragon vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-3265-2 linux-lts-xenial vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- SUSE-SU-2017:1183-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:1990-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · May 2, 2025
- ELSA-2017-3539 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Apr 13, 2017
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1427984
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ca4ef4574f1ee5252e2cd365f8f5d5bafd048f32
- [oss-security] 20170228 Linux: ip: fix IP_CHECKSUM handling (CVE-2017-6347) mailing-list
- https://github.com/torvalds/linux/commit/ca4ef4574f1ee5252e2cd365f8f5d5bafd048f32
- 96487 vdb-entry
- http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.10.1