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CVE-2016-4997

Publication date 24 June 2016

Last updated 24 July 2024

Ubuntu priority

High

Why this priority?

Cvss 3 Severity Score

7.8 · High

Score breakdown

The compat IPT_SO_SET_REPLACE and IP6T_SO_SET_REPLACE setsockopt implementations in the netfilter subsystem in the Linux kernel before 4.6.3 allow local users to gain privileges or cause a denial of service (memory corruption) by leveraging in-container root access to provide a crafted offset value that triggers an unintended decrement.

From the Ubuntu Security Team

Jesse Hertz and Tim Newsham discovered that the Linux netfilter implementation did not correctly perform validation when handling 32 bit compatibility IPT_SO_SET_REPLACE events on 64 bit platforms. A local unprivileged attacker could use this to cause a denial of service (system crash) or execute arbitrary code with administrative privileges.

Read the notes from the security team

Status

Package Ubuntu Release Status
linux 17.10 artful
Not affected
17.04 zesty
Not affected
16.10 yakkety
Not affected
16.04 LTS xenial
Fixed 4.4.0-28.47
15.10 wily
Fixed 4.2.0-41.48
14.04 LTS trusty
Fixed 3.13.0-91.138
12.04 LTS precise Ignored end of life
linux-armadaxp 17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial Not in release
15.10 wily Not in release
14.04 LTS trusty Not in release
12.04 LTS precise Ignored end of life
linux-aws 17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial
Not affected
14.04 LTS trusty
Not affected
12.04 LTS precise Not in release
linux-azure 17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial
Not affected
14.04 LTS trusty
Not affected
linux-euclid 17.10 artful Not in release
17.04 zesty Not in release
16.04 LTS xenial
Not affected
14.04 LTS trusty Not in release
linux-flo 17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Ignored end of life
16.04 LTS xenial Ignored abandoned
15.10 wily Ignored end of life
14.04 LTS trusty Not in release
12.04 LTS precise Not in release
linux-gcp 17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial
Not affected
14.04 LTS trusty Not in release
linux-gke 17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial
Not affected
14.04 LTS trusty Not in release
12.04 LTS precise Not in release
linux-goldfish 17.10 artful Not in release
17.04 zesty Ignored end of life
16.10 yakkety Ignored end of life
16.04 LTS xenial Ignored abandoned
15.10 wily Ignored end of life
14.04 LTS trusty Not in release
12.04 LTS precise Not in release
linux-grouper 17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial Not in release
15.10 wily Not in release
14.04 LTS trusty Not in release
12.04 LTS precise Not in release
linux-hwe 17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial
Not affected
14.04 LTS trusty Not in release
12.04 LTS precise Not in release
linux-hwe-edge 17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial
Not affected
14.04 LTS trusty Not in release
12.04 LTS precise Not in release
linux-kvm 17.10 artful Not in release
17.04 zesty Not in release
16.04 LTS xenial
Not affected
14.04 LTS trusty Not in release
linux-linaro-omap 17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial Not in release
15.10 wily Not in release
14.04 LTS trusty Not in release
12.04 LTS precise Ignored end of life
linux-linaro-shared 17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial Not in release
15.10 wily Not in release
14.04 LTS trusty Not in release
12.04 LTS precise Ignored end of life
linux-linaro-vexpress 17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial Not in release
15.10 wily Not in release
14.04 LTS trusty Not in release
12.04 LTS precise Ignored end of life
linux-lts-quantal 17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial Not in release
15.10 wily Not in release
14.04 LTS trusty Not in release
12.04 LTS precise Ignored end of life
linux-lts-raring 17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial Not in release
15.10 wily Not in release
14.04 LTS trusty Not in release
12.04 LTS precise Ignored end of life
linux-lts-saucy 17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial Not in release
15.10 wily Not in release
14.04 LTS trusty Not in release
12.04 LTS precise Ignored end of life
linux-lts-trusty 17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial Not in release
15.10 wily Not in release
14.04 LTS trusty Not in release
12.04 LTS precise
Fixed 3.13.0-91.138~precise1
linux-lts-utopic 17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial Not in release
15.10 wily Not in release
14.04 LTS trusty
Fixed 3.16.0-76.98~14.04.1
12.04 LTS precise Not in release
linux-lts-vivid 17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial Not in release
15.10 wily Not in release
14.04 LTS trusty
Fixed 3.19.0-64.72~14.04.1
12.04 LTS precise Not in release
linux-lts-wily 17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial Not in release
15.10 wily Not in release
14.04 LTS trusty
Fixed 4.2.0-41.48~14.04.1
12.04 LTS precise Not in release
linux-lts-xenial 17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial Not in release
15.10 wily Not in release
14.04 LTS trusty
Fixed 4.4.0-28.47~14.04.1
12.04 LTS precise Not in release
linux-maguro 17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial Not in release
15.10 wily Not in release
14.04 LTS trusty Not in release
12.04 LTS precise Not in release
linux-mako 17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Ignored end of life
16.04 LTS xenial Ignored abandoned
15.10 wily Ignored end of life
14.04 LTS trusty Not in release
12.04 LTS precise Not in release
linux-manta 17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial Not in release
15.10 wily Ignored end of life
14.04 LTS trusty Not in release
12.04 LTS precise Not in release
linux-oem 17.10 artful Not in release
17.04 zesty Not in release
16.04 LTS xenial
Not affected
14.04 LTS trusty Not in release
linux-qcm-msm 17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial Not in release
15.10 wily Not in release
14.04 LTS trusty Not in release
12.04 LTS precise Ignored end of life
linux-raspi2 17.10 artful
Not affected
17.04 zesty
Not affected
16.10 yakkety
Not affected
16.04 LTS xenial
Fixed 4.4.0-1016.22
15.10 wily
Fixed 4.2.0-1033.43
14.04 LTS trusty Not in release
12.04 LTS precise Not in release
linux-snapdragon 17.10 artful
Not affected
17.04 zesty
Not affected
16.10 yakkety
Not affected
16.04 LTS xenial
Fixed 4.4.0-1019.22
15.10 wily Not in release
14.04 LTS trusty Not in release
12.04 LTS precise Not in release
linux-ti-omap4 17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial Not in release
15.10 wily Not in release
14.04 LTS trusty Not in release
12.04 LTS precise Ignored end of life

Notes

jdstrand

android kernels (flo, goldfish, grouper, maguro, mako and manta) are not supported on the Ubuntu Touch 14.10 and earlier preview kernels linux-lts-saucy no longer receives official support linux-lts-quantal no longer receives official support

sbeattie

priority is negligible on precise's 3.2 kernels, as user namespaces are a privileged operation there. For xenial and linux-lts-xenial on trusty, this can be mitigated against by setting the kernel.unprivileged_userns_clone sysctl to 0 to disable userns support. When we fix the netfilter issue we will also add this sysctl to all other supported kernels to allow disabling unprivileged user namespaces. Disabling user namespace may impact chromium-browser, lxc, lxd, docker, and other tools.

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
linux

Severity score breakdown

Parameter Value
Base score 7.8 · High
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

    • USN-3020-1
    • Linux kernel (Vivid HWE) vulnerabilities
    • 27 June 2016
    • USN-3018-2
    • Linux kernel (Trusty HWE) vulnerabilities
    • 27 June 2016
    • USN-3018-1
    • Linux kernel vulnerabilities
    • 27 June 2016
    • USN-3019-1
    • Linux kernel (Utopic HWE) vulnerabilities
    • 27 June 2016
    • USN-3017-3
    • Linux kernel (Wily HWE) vulnerabilities
    • 27 June 2016
    • USN-3338-1
    • Linux kernel vulnerabilities
    • 21 June 2017
    • USN-3016-1
    • Linux kernel vulnerabilities
    • 27 June 2016
    • USN-3016-3
    • Linux kernel (Qualcomm Snapdragon) vulnerabilities
    • 27 June 2016
    • USN-3016-4
    • Linux kernel (Xenial HWE) vulnerabilities
    • 27 June 2016
    • USN-3016-2
    • Linux kernel (Raspberry Pi 2) vulnerabilities
    • 27 June 2016
    • USN-3017-1
    • Linux kernel vulnerabilities
    • 27 June 2016
    • USN-3017-2
    • Linux kernel (Raspberry Pi 2) vulnerabilities
    • 27 June 2016

Other references