CVE-2016-4581

Published: 23 May 2016

fs/pnode.c in the Linux kernel before 4.5.4 does not properly traverse a mount propagation tree in a certain case involving a slave mount, which allows local users to cause a denial of service (NULL pointer dereference and OOPS) via a crafted series of mount system calls.

From the Ubuntu Security Team

It was discovered that in some situations the Linux kernel did not handle propagated mounts correctly. A local unprivileged attacker could use this to cause a denial of service (system crash).

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	Released (3.13.0-87.133)
	wily	Released (4.2.0-38.45)
	xenial	Released (4.4.0-24.43)
	yakkety	Not vulnerable (4.4.0-23.41)
	upstream	Released (4.6~rc7)
	Patches: Introduced by f2ebb3a921c1ca1e2ddd9242e95a1989a50c4c68 Fixed by 5ec0811d30378ae104f250bfc9b3640242d81e3f
linux-armadaxp Launchpad, Ubuntu, Debian	precise	Not vulnerable
	trusty	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	upstream	Released (4.6~rc7)
	This package is not directly supported by the Ubuntu Security Team
linux-aws Launchpad, Ubuntu, Debian	trusty	Not vulnerable (4.4.0-1002.2)
	xenial	Not vulnerable (4.4.0-1001.10)
	yakkety	Does not exist
	upstream	Released (4.6~rc7)
	precise	Does not exist
linux-flo Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Does not exist (trusty was ignored)
	wily	Not vulnerable
	xenial	Not vulnerable
	yakkety	Not vulnerable
	upstream	Released (4.6~rc7)
linux-gke Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Does not exist
	xenial	Not vulnerable (4.4.0-1003.3)
	yakkety	Does not exist
	upstream	Released (4.6~rc7)
linux-goldfish Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Does not exist (trusty was ignored)
	wily	Not vulnerable
	xenial	Not vulnerable
	yakkety	Not vulnerable
	upstream	Released (4.6~rc7)
linux-grouper Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Does not exist (trusty was ignored)
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	upstream	Released (4.6~rc7)
linux-hwe Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Does not exist
	xenial	Not vulnerable (4.8.0-36.36~16.04.1)
	yakkety	Does not exist
	upstream	Released (4.6~rc7)
linux-hwe-edge Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Does not exist
	xenial	Not vulnerable (4.8.0-36.36~16.04.1)
	yakkety	Does not exist
	upstream	Released (4.6~rc7)
linux-linaro-omap Launchpad, Ubuntu, Debian	precise	Ignored (end of life)
	trusty	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	upstream	Released (4.6~rc7)
linux-linaro-shared Launchpad, Ubuntu, Debian	precise	Ignored (end of life)
	trusty	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	upstream	Released (4.6~rc7)
linux-linaro-vexpress Launchpad, Ubuntu, Debian	precise	Ignored (end of life)
	trusty	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	upstream	Released (4.6~rc7)
linux-lts-quantal Launchpad, Ubuntu, Debian	precise	Ignored (end of life)
	trusty	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	upstream	Released (4.6~rc7)
	This package is not directly supported by the Ubuntu Security Team
linux-lts-raring Launchpad, Ubuntu, Debian	precise	Ignored (end of life)
	trusty	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	upstream	Released (4.6~rc7)
linux-lts-saucy Launchpad, Ubuntu, Debian	precise	Ignored (end of life)
	trusty	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	upstream	Released (4.6~rc7)
	This package is not directly supported by the Ubuntu Security Team
linux-lts-trusty Launchpad, Ubuntu, Debian	precise	Released (3.13.0-88.135~precise1)
	trusty	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	upstream	Released (4.6~rc7)
linux-lts-utopic Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Released (3.16.0-73.95~14.04.1)
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	upstream	Released (4.6~rc7)
linux-lts-vivid Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Released (3.19.0-61.69~14.04.1)
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	upstream	Released (4.6~rc7)
linux-lts-wily Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Released (4.2.0-38.45~14.04.1)
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	upstream	Released (4.6~rc7)
linux-lts-xenial Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Released (4.4.0-24.43~14.04.1)
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	upstream	Released (4.6~rc7)
linux-maguro Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Does not exist (trusty was ignored)
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	upstream	Released (4.6~rc7)
linux-mako Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Does not exist (trusty was ignored)
	wily	Not vulnerable
	xenial	Not vulnerable
	yakkety	Not vulnerable
	upstream	Released (4.6~rc7)
linux-manta Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Does not exist (trusty was ignored)
	wily	Not vulnerable
	xenial	Does not exist
	yakkety	Does not exist
	upstream	Released (4.6~rc7)
linux-qcm-msm Launchpad, Ubuntu, Debian	precise	Ignored (end of life)
	trusty	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	upstream	Released (4.6~rc7)
linux-raspi2 Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Does not exist
	wily	Released (4.2.0-1031.41)
	xenial	Released (4.4.0-1012.16)
	yakkety	Not vulnerable (4.4.0-1011.14)
	upstream	Released (4.6~rc7)
linux-snapdragon Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Does not exist
	wily	Does not exist
	xenial	Released (4.4.0-1015.18)
	yakkety	Not vulnerable (4.4.0-1014.16)
	upstream	Released (4.6~rc7)
linux-ti-omap4 Launchpad, Ubuntu, Debian	precise	Not vulnerable
	trusty	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	upstream	Released (4.6~rc7)

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:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References

Bugs

https://launchpad.net/bugs/1581869

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