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CVE-2015-2877

Publication date 3 March 2017

Last updated 24 July 2024

Ubuntu priority

Low

Why this priority?

Cvss 3 Severity Score

3.3 · Low

Score breakdown

** DISPUTED ** Kernel Samepage Merging (KSM) in the Linux kernel 2.6.32 through 4.x does not prevent use of a write-timing side channel, which allows guest OS users to defeat the ASLR protection mechanism on other guest OS instances via a Cross-VM ASL INtrospection (CAIN) attack. NOTE: the vendor states "Basically if you care about this attack vector, disable deduplication." Share-until-written approaches for memory conservation among mutually untrusting tenants are inherently detectable for information disclosure, and can be classified as potentially misunderstood behaviors rather than vulnerabilities.

Read the notes from the security team

Mitigation

If qemu-kvm is installed, set KSM_ENABLED=0 in /etc/default/qemu-kvm, otherwise will need to echo -n 0 > /sys/kernel/mm/ksm/run

Status

Package Ubuntu Release Status
linux 18.10 cosmic Ignored
18.04 LTS bionic Ignored
17.10 artful Ignored
17.04 zesty Ignored
16.10 yakkety Ignored
16.04 LTS xenial Ignored
15.10 wily Ignored
15.04 vivid Ignored
14.10 utopic Ignored
14.04 LTS trusty Ignored
12.04 LTS precise Ignored
linux-armadaxp 18.10 cosmic Not in release
18.04 LTS bionic Not in release
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
15.04 vivid Not in release
14.10 utopic Not in release
14.04 LTS trusty Not in release
12.04 LTS precise Ignored
linux-aws 18.10 cosmic Ignored
18.04 LTS bionic Ignored
17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial Ignored
14.04 LTS trusty Ignored
12.04 LTS precise Not in release
linux-azure 18.10 cosmic Ignored
18.04 LTS bionic Ignored
17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial Ignored
14.04 LTS trusty Ignored
linux-azure-edge 18.10 cosmic Not in release
18.04 LTS bionic Ignored
16.04 LTS xenial Ignored
14.04 LTS trusty Not in release
linux-ec2 18.10 cosmic Not in release
18.04 LTS bionic Not in release
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
15.04 vivid Not in release
14.10 utopic Not in release
14.04 LTS trusty Not in release
12.04 LTS precise Not in release
linux-euclid 18.10 cosmic Not in release
18.04 LTS bionic Not in release
17.10 artful Not in release
17.04 zesty Not in release
16.04 LTS xenial Ignored
14.04 LTS trusty Not in release
linux-flo 18.10 cosmic Not in release
18.04 LTS bionic Not in release
17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Ignored
16.04 LTS xenial Ignored
15.10 wily Ignored
15.04 vivid Ignored
14.10 utopic Ignored
14.04 LTS trusty Not in release
12.04 LTS precise Not in release
linux-fsl-imx51 18.10 cosmic Not in release
18.04 LTS bionic Not in release
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
15.04 vivid Not in release
14.10 utopic Not in release
14.04 LTS trusty Not in release
12.04 LTS precise Not in release
linux-gcp 18.10 cosmic Ignored
18.04 LTS bionic Ignored
17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial Ignored
14.04 LTS trusty Not in release
linux-gke 18.10 cosmic Not in release
18.04 LTS bionic Not in release
17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial Ignored
14.04 LTS trusty Not in release
12.04 LTS precise Not in release
linux-goldfish 18.10 cosmic Not in release
18.04 LTS bionic Not in release
17.10 artful Not in release
17.04 zesty Ignored
16.10 yakkety Ignored
16.04 LTS xenial Ignored
15.10 wily Ignored
15.04 vivid Ignored
14.10 utopic Ignored
14.04 LTS trusty Not in release
12.04 LTS precise Not in release
linux-grouper 18.10 cosmic Not in release
18.04 LTS bionic Not in release
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
15.04 vivid Not in release
14.10 utopic Ignored
14.04 LTS trusty Not in release
12.04 LTS precise Not in release
linux-hwe 18.10 cosmic Not in release
18.04 LTS bionic Ignored
17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial Ignored
14.04 LTS trusty Not in release
12.04 LTS precise Not in release
linux-hwe-edge 18.10 cosmic Not in release
18.04 LTS bionic Ignored
17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial Ignored
14.04 LTS trusty Not in release
12.04 LTS precise Not in release
linux-kvm 18.10 cosmic Ignored
18.04 LTS bionic Ignored
17.10 artful Not in release
17.04 zesty Not in release
16.04 LTS xenial Ignored
14.04 LTS trusty Not in release
linux-linaro-omap 18.10 cosmic Not in release
18.04 LTS bionic Not in release
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
15.04 vivid Not in release
14.10 utopic Not in release
14.04 LTS trusty Not in release
12.04 LTS precise Ignored
linux-linaro-shared 18.10 cosmic Not in release
18.04 LTS bionic Not in release
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
15.04 vivid Not in release
14.10 utopic Not in release
14.04 LTS trusty Not in release
12.04 LTS precise Ignored
linux-linaro-vexpress 18.10 cosmic Not in release
18.04 LTS bionic Not in release
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
15.04 vivid Not in release
14.10 utopic Not in release
14.04 LTS trusty Not in release
12.04 LTS precise Ignored
linux-lts-quantal 18.10 cosmic Not in release
18.04 LTS bionic Not in release
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
15.04 vivid Not in release
14.10 utopic Not in release
14.04 LTS trusty Not in release
12.04 LTS precise Ignored
linux-lts-raring 18.10 cosmic Not in release
18.04 LTS bionic Not in release
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
15.04 vivid Not in release
14.10 utopic Not in release
14.04 LTS trusty Not in release
12.04 LTS precise Ignored
linux-lts-saucy 18.10 cosmic Not in release
18.04 LTS bionic Not in release
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
15.04 vivid Not in release
14.10 utopic Not in release
14.04 LTS trusty Not in release
12.04 LTS precise Ignored
linux-lts-trusty 18.10 cosmic Not in release
18.04 LTS bionic Not in release
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
15.04 vivid Not in release
14.10 utopic Not in release
14.04 LTS trusty Not in release
12.04 LTS precise Ignored
linux-lts-utopic 18.10 cosmic Not in release
18.04 LTS bionic Not in release
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
15.04 vivid Not in release
14.10 utopic Not in release
14.04 LTS trusty Ignored
12.04 LTS precise Not in release
linux-lts-vivid 18.10 cosmic Not in release
18.04 LTS bionic Not in release
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
15.04 vivid Not in release
14.10 utopic Not in release
14.04 LTS trusty Ignored
12.04 LTS precise Not in release
linux-lts-wily 18.10 cosmic Not in release
18.04 LTS bionic Not in release
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
15.04 vivid Not in release
14.04 LTS trusty Ignored
12.04 LTS precise Not in release
linux-lts-xenial 18.10 cosmic Not in release
18.04 LTS bionic Not in release
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
15.04 vivid Not in release
14.04 LTS trusty Ignored
12.04 LTS precise Not in release
linux-maguro 18.10 cosmic Not in release
18.04 LTS bionic Not in release
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
15.04 vivid Not in release
14.10 utopic Not in release
14.04 LTS trusty Not in release
12.04 LTS precise Not in release
linux-mako 18.10 cosmic Not in release
18.04 LTS bionic Not in release
17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Ignored
16.04 LTS xenial Ignored
15.10 wily Ignored
15.04 vivid Ignored
14.10 utopic Ignored
14.04 LTS trusty Not in release
12.04 LTS precise Not in release
linux-manta 18.10 cosmic Not in release
18.04 LTS bionic Not in release
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
15.04 vivid Ignored
14.10 utopic Ignored
14.04 LTS trusty Not in release
12.04 LTS precise Not in release
linux-mvl-dove 18.10 cosmic Not in release
18.04 LTS bionic Not in release
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
15.04 vivid Not in release
14.10 utopic Not in release
14.04 LTS trusty Not in release
12.04 LTS precise Not in release
linux-oem 18.10 cosmic Ignored
18.04 LTS bionic Ignored
17.10 artful Not in release
17.04 zesty Not in release
16.04 LTS xenial Ignored
14.04 LTS trusty Not in release
linux-qcm-msm 18.10 cosmic Not in release
18.04 LTS bionic Not in release
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
15.04 vivid Not in release
14.10 utopic Not in release
14.04 LTS trusty Not in release
12.04 LTS precise Ignored
linux-raspi2 18.10 cosmic Ignored
18.04 LTS bionic Ignored
17.10 artful Ignored
17.04 zesty Ignored
16.10 yakkety Ignored
16.04 LTS xenial Ignored
15.10 wily Ignored
15.04 vivid Not in release
14.04 LTS trusty Not in release
12.04 LTS precise Not in release
linux-snapdragon 18.10 cosmic Not in release
18.04 LTS bionic Ignored
17.10 artful Ignored
17.04 zesty Ignored
16.10 yakkety Ignored
16.04 LTS xenial Ignored
15.10 wily Not in release
14.04 LTS trusty Not in release
12.04 LTS precise Not in release
linux-ti-omap4 18.10 cosmic Not in release
18.04 LTS bionic Not in release
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
15.04 vivid Not in release
14.10 utopic Not in release
14.04 LTS trusty Not in release
12.04 LTS precise Ignored

Notes

tyhicks

The behavior represented by CVE-2015-2877 is inherent to Kernel Samepage Merging. To mitigate the issue, follow the steps above to disable KSM.

Severity score breakdown

Parameter Value
Base score 3.3 · Low
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality Low
Integrity impact None
Availability impact None
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N