CVE-2015-4176

Published: 2 May 2016

fs/namespace.c in the Linux kernel before 4.0.2 does not properly support mount connectivity, which allows local users to read arbitrary files by leveraging user-namespace root access for deletion of a file or directory.

Notes

Author	Note
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

Author

Note

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

Priority

Cvss 3 Severity Score

5.5

Score breakdown

Status

Package	Release	Status
linux Launchpad, Ubuntu, Debian	precise	Not vulnerable
	trusty	Not vulnerable
	upstream	Released (4.1~rc1)
	utopic	Not vulnerable
	vivid	Not vulnerable
	wily	Not vulnerable (4.0.0-4.6)
	xenial	Not vulnerable (4.2.0-16.19)
	yakkety	Not vulnerable (4.4.0-21.37)
	Patches: Introduced by ce07d891a0891d3c0d0c2d73d577490486b809e1 Fixed by e0c9c0afd2fc958ffa34b697972721d81df8a56f
linux-armadaxp Launchpad, Ubuntu, Debian	precise	Not vulnerable
	trusty	Does not exist
	upstream	Released (4.1~rc1)
	utopic	Does not exist
	vivid	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	This package is not directly supported by the Ubuntu Security Team
linux-aws Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Not vulnerable (4.4.0-1002.2)
	upstream	Released (4.1~rc1)
	xenial	Not vulnerable (4.4.0-1001.10)
	yakkety	Does not exist
linux-ec2 Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.1~rc1)
	utopic	Does not exist
	vivid	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
linux-flo Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Does not exist (trusty was ignored)
	upstream	Released (4.1~rc1)
	utopic	Not vulnerable
	vivid	Not vulnerable
	wily	Not vulnerable
	xenial	Not vulnerable
	yakkety	Not vulnerable
linux-fsl-imx51 Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.1~rc1)
	utopic	Does not exist
	vivid	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
linux-gke Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.1~rc1)
	xenial	Not vulnerable (4.4.0-1003.3)
	yakkety	Does not exist
linux-goldfish Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Does not exist (trusty was ignored)
	upstream	Released (4.1~rc1)
	utopic	Not vulnerable
	vivid	Not vulnerable
	wily	Not vulnerable
	xenial	Not vulnerable
	yakkety	Not vulnerable
linux-grouper Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Does not exist (trusty was ignored)
	upstream	Released (4.1~rc1)
	utopic	Ignored (reached end-of-life)
	vivid	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
linux-hwe Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.1~rc1)
	xenial	Not vulnerable (4.8.0-36.36~16.04.1)
	yakkety	Does not exist
linux-hwe-edge Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.1~rc1)
	xenial	Not vulnerable (4.8.0-36.36~16.04.1)
	yakkety	Does not exist
linux-linaro-omap Launchpad, Ubuntu, Debian	precise	Ignored (abandoned)
	trusty	Does not exist
	upstream	Released (4.1~rc1)
	utopic	Does not exist
	vivid	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
linux-linaro-shared Launchpad, Ubuntu, Debian	precise	Ignored (abandoned)
	trusty	Does not exist
	upstream	Released (4.1~rc1)
	utopic	Does not exist
	vivid	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
linux-linaro-vexpress Launchpad, Ubuntu, Debian	precise	Ignored (abandoned)
	trusty	Does not exist
	upstream	Released (4.1~rc1)
	utopic	Does not exist
	vivid	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
linux-lts-quantal Launchpad, Ubuntu, Debian	precise	Not vulnerable
	trusty	Does not exist
	upstream	Released (4.1~rc1)
	utopic	Does not exist
	vivid	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	This package is not directly supported by the Ubuntu Security Team
linux-lts-raring Launchpad, Ubuntu, Debian	precise	Ignored (was needs-triage now end-of-life)
	trusty	Does not exist
	upstream	Released (4.1~rc1)
	utopic	Does not exist
	vivid	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
linux-lts-saucy Launchpad, Ubuntu, Debian	precise	Not vulnerable
	trusty	Does not exist
	upstream	Released (4.1~rc1)
	utopic	Does not exist
	vivid	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	This package is not directly supported by the Ubuntu Security Team
linux-lts-trusty Launchpad, Ubuntu, Debian	precise	Not vulnerable
	trusty	Does not exist
	upstream	Released (4.1~rc1)
	utopic	Does not exist
	vivid	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
linux-lts-utopic Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Does not exist (trusty was not-affected)
	upstream	Released (4.1~rc1)
	utopic	Does not exist
	vivid	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
linux-lts-vivid Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Does not exist (trusty was not-affected)
	upstream	Released (4.1~rc1)
	utopic	Does not exist
	vivid	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
linux-lts-wily Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Does not exist (trusty was not-affected [4.2.0-18.22~14.04.1])
	upstream	Released (4.1~rc1)
	vivid	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
linux-lts-xenial Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Not vulnerable (4.4.0-13.29~14.04.1)
	upstream	Released (4.1~rc1)
	vivid	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
linux-maguro Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Does not exist (trusty was ignored)
	upstream	Released (4.1~rc1)
	utopic	Does not exist
	vivid	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
linux-mako Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Does not exist (trusty was ignored)
	upstream	Released (4.1~rc1)
	utopic	Not vulnerable
	vivid	Not vulnerable
	wily	Not vulnerable
	xenial	Not vulnerable
	yakkety	Not vulnerable
linux-manta Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Does not exist (trusty was ignored)
	upstream	Released (4.1~rc1)
	utopic	Not vulnerable
	vivid	Not vulnerable
	wily	Not vulnerable
	xenial	Does not exist
	yakkety	Does not exist
linux-mvl-dove Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.1~rc1)
	utopic	Does not exist
	vivid	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
linux-qcm-msm Launchpad, Ubuntu, Debian	precise	Ignored (abandoned)
	trusty	Does not exist
	upstream	Released (4.1~rc1)
	utopic	Does not exist
	vivid	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
linux-raspi2 Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.1~rc1)
	vivid	Does not exist
	wily	Not vulnerable (4.2.0-1008.12)
	xenial	Not vulnerable (4.2.0-1013.19)
	yakkety	Not vulnerable (4.4.0-1009.10)
linux-snapdragon Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.1~rc1)
	wily	Does not exist
	xenial	Not vulnerable (4.4.0-1012.12)
	yakkety	Not vulnerable (4.4.0-1012.12)
linux-ti-omap4 Launchpad, Ubuntu, Debian	precise	Not vulnerable
	trusty	Does not exist
	upstream	Released (4.1~rc1)
	utopic	Does not exist
	vivid	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist

Severity score breakdown

Parameter	Value
Base score	5.5
Attack vector	Local
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	None
Availability impact	None
Vector	CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

References

Bugs

https://launchpad.net/bugs/1462244

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