CVE-2014-7975

Published: 13 October 2014

The do_umount function in fs/namespace.c in the Linux kernel through 3.17 does not require the CAP_SYS_ADMIN capability for do_remount_sb calls that change the root filesystem to read-only, which allows local users to cause a denial of service (loss of writability) by making certain unshare system calls, clearing the / MNT_LOCKED flag, and making an MNT_FORCE umount system call.

From the Ubuntu Security Team

Andy Lutomirski discovered that the Linux kernel was not checking the CAP_SYS_ADMIN when remounting filesystems to read-only. A local user could exploit this flaw to cause a denial of service (loss of writability).

Notes

Author	Note
jdstrand	android kernels (flo, goldfish, grouper, maguro, mako and manta) are not supported on the Ubuntu Touch 14.04 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 14.04 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	lucid	Released (2.6.32-68.135)
	precise	Released (3.2.0-72.107)
	trusty	Released (3.13.0-40.69)
	upstream	Released (3.18~rc1)
	utopic	Released (3.16.0-25.33)
	vivid	Not vulnerable (3.16.0-25.33)
	wily	Not vulnerable (3.19.0-15.15)
	xenial	Not vulnerable (4.2.0-16.19)
	yakkety	Not vulnerable (4.4.0-21.37)
	zesty	Not vulnerable (4.8.0-22.24)
	Patches: Introduced by 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Fixed by a1480dcc3c706e309a88884723446f2e84fedd5b
linux-2.6 Launchpad, Ubuntu, Debian	lucid	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (3.18~rc1)
	utopic	Does not exist
	vivid	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	zesty	Does not exist
linux-armadaxp Launchpad, Ubuntu, Debian	lucid	Does not exist
	precise	Does not exist (precise was released [3.2.0-1641.59])
	trusty	Does not exist
	upstream	Released (3.18~rc1)
	utopic	Does not exist
	vivid	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	zesty	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 (3.18~rc1)
	xenial	Not vulnerable (4.4.0-1001.10)
	yakkety	Does not exist
	zesty	Does not exist
linux-ec2 Launchpad, Ubuntu, Debian	lucid	Released (2.6.32-372.89)
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (3.18~rc1)
	utopic	Does not exist
	vivid	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	zesty	Does not exist
linux-flo Launchpad, Ubuntu, Debian	lucid	Does not exist
	precise	Does not exist
	trusty	Does not exist (trusty was ignored)
	upstream	Released (3.18~rc1)
	utopic	Ignored (reached end-of-life)
	vivid	Ignored (reached end-of-life)
	wily	Ignored (reached end-of-life)
	xenial	Ignored (abandoned)
	yakkety	Ignored (abandoned)
	zesty	Does not exist
linux-fsl-imx51 Launchpad, Ubuntu, Debian	lucid	Ignored (reached end-of-life, does not affect buildd)
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (3.18~rc1)
	utopic	Does not exist
	vivid	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	zesty	Does not exist
linux-gke Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Does not exist
	upstream	Released (3.18~rc1)
	xenial	Not vulnerable (4.4.0-1003.3)
	yakkety	Does not exist
	zesty	Does not exist
linux-goldfish Launchpad, Ubuntu, Debian	lucid	Does not exist
	precise	Does not exist
	trusty	Does not exist (trusty was ignored)
	upstream	Released (3.18~rc1)
	utopic	Ignored (reached end-of-life)
	vivid	Ignored (reached end-of-life)
	wily	Ignored (reached end-of-life)
	xenial	Ignored (abandoned)
	yakkety	Ignored (abandoned)
	zesty	Ignored (abandoned)
linux-grouper Launchpad, Ubuntu, Debian	lucid	Does not exist
	precise	Does not exist
	trusty	Does not exist (trusty was ignored)
	upstream	Released (3.18~rc1)
	utopic	Ignored (reached end-of-life)
	vivid	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	zesty	Does not exist
linux-hwe Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Does not exist
	upstream	Released (3.18~rc1)
	xenial	Not vulnerable (4.8.0-36.36~16.04.1)
	yakkety	Does not exist
	zesty	Does not exist
linux-hwe-edge Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Does not exist
	upstream	Released (3.18~rc1)
	xenial	Not vulnerable (4.8.0-36.36~16.04.1)
	yakkety	Does not exist
	zesty	Does not exist
linux-linaro-omap Launchpad, Ubuntu, Debian	lucid	Does not exist
	precise	Does not exist (precise was ignored [abandoned])
	trusty	Does not exist
	upstream	Released (3.18~rc1)
	utopic	Does not exist
	vivid	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	zesty	Does not exist
linux-linaro-shared Launchpad, Ubuntu, Debian	lucid	Does not exist
	precise	Does not exist (precise was ignored [abandoned])
	trusty	Does not exist
	upstream	Released (3.18~rc1)
	utopic	Does not exist
	vivid	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	zesty	Does not exist
linux-linaro-vexpress Launchpad, Ubuntu, Debian	lucid	Does not exist
	precise	Does not exist (precise was ignored [abandoned])
	trusty	Does not exist
	upstream	Released (3.18~rc1)
	utopic	Does not exist
	vivid	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	zesty	Does not exist
linux-lts-quantal Launchpad, Ubuntu, Debian	lucid	Does not exist
	precise	Does not exist (precise was ignored [was pending [3.5.0-57.84~precise1] OEM release])
	trusty	Does not exist
	upstream	Released (3.18~rc1)
	utopic	Does not exist
	vivid	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	zesty	Does not exist
	This package is not directly supported by the Ubuntu Security Team
linux-lts-raring Launchpad, Ubuntu, Debian	lucid	Does not exist
	precise	Does not exist (precise was ignored [was needs-triage now end-of-life])
	trusty	Does not exist
	upstream	Released (3.18~rc1)
	utopic	Does not exist
	vivid	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	zesty	Does not exist
linux-lts-saucy Launchpad, Ubuntu, Debian	lucid	Does not exist
	precise	Does not exist (precise was ignored [was pending [3.11.0-30.51~precise1] OEM release])
	trusty	Does not exist
	upstream	Released (3.18~rc1)
	utopic	Does not exist
	vivid	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	zesty	Does not exist
	This package is not directly supported by the Ubuntu Security Team
linux-lts-trusty Launchpad, Ubuntu, Debian	lucid	Does not exist
	precise	Released (3.13.0-40.69~precise1)
	trusty	Does not exist
	upstream	Released (3.18~rc1)
	utopic	Does not exist
	vivid	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	zesty	Does not exist
linux-lts-utopic Launchpad, Ubuntu, Debian	lucid	Does not exist
	precise	Does not exist
	trusty	Does not exist (trusty was not-affected [3.16.0-25.33~14.04.2])
	upstream	Released (3.18~rc1)
	utopic	Does not exist
	vivid	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	zesty	Does not exist
linux-lts-vivid Launchpad, Ubuntu, Debian	lucid	Does not exist
	precise	Does not exist
	trusty	Does not exist (trusty was not-affected [3.19.0-18.18~14.04.1])
	upstream	Released (3.18~rc1)
	utopic	Does not exist
	vivid	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	zesty	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 (3.18~rc1)
	vivid	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	zesty	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 (3.18~rc1)
	vivid	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	zesty	Does not exist
linux-maguro Launchpad, Ubuntu, Debian	lucid	Does not exist
	precise	Does not exist
	trusty	Does not exist (trusty was ignored)
	upstream	Released (3.18~rc1)
	utopic	Does not exist
	vivid	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	zesty	Does not exist
linux-mako Launchpad, Ubuntu, Debian	lucid	Does not exist
	precise	Does not exist
	trusty	Does not exist (trusty was ignored)
	upstream	Released (3.18~rc1)
	utopic	Ignored (reached end-of-life)
	vivid	Ignored (reached end-of-life)
	wily	Ignored (reached end-of-life)
	xenial	Ignored (abandoned)
	yakkety	Ignored (abandoned)
	zesty	Does not exist
linux-manta Launchpad, Ubuntu, Debian	lucid	Does not exist
	precise	Does not exist
	trusty	Does not exist (trusty was ignored)
	upstream	Released (3.18~rc1)
	utopic	Ignored (reached end-of-life)
	vivid	Ignored (reached end-of-life)
	wily	Ignored (reached end-of-life)
	xenial	Does not exist
	yakkety	Does not exist
	zesty	Does not exist
linux-mvl-dove Launchpad, Ubuntu, Debian	lucid	Ignored (reached end-of-life)
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (3.18~rc1)
	utopic	Does not exist
	vivid	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	zesty	Does not exist
linux-qcm-msm Launchpad, Ubuntu, Debian	lucid	Ignored (abandoned)
	precise	Does not exist (precise was ignored [abandoned])
	trusty	Does not exist
	upstream	Released (3.18~rc1)
	utopic	Does not exist
	vivid	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	zesty	Does not exist
linux-raspi2 Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Does not exist
	upstream	Released (3.18~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)
	zesty	Not vulnerable (4.8.0-1013.15)
linux-snapdragon Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Does not exist
	upstream	Released (3.18~rc1)
	wily	Does not exist
	xenial	Not vulnerable (4.4.0-1012.12)
	yakkety	Not vulnerable (4.4.0-1012.12)
	zesty	Not vulnerable (4.4.0-1029.32)
linux-ti-omap4 Launchpad, Ubuntu, Debian	lucid	Does not exist
	precise	Does not exist (precise was released [3.2.0-1456.76])
	trusty	Does not exist
	upstream	Released (3.18~rc1)
	utopic	Does not exist
	vivid	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	zesty	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	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References

Bugs

https://launchpad.net/bugs/1383358

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