CVE-2015-8374

Published: 28 December 2015

fs/btrfs/inode.c in the Linux kernel before 4.3.3 mishandles compressed inline extents, which allows local users to obtain sensitive pre-truncation information from a file via a clone action.

From the Ubuntu Security Team

It was discovered that the Btrfs implementation in the Linux kernel incorrectly handled compressed inline extants on truncation. A local attacker could use this to expose sensitive information.

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
tyhicks	From the fix's commit message, "This problem exists since the clone ioctl was added ...". BTRFS_IOC_CLONE was added by f2eb0a24.

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

tyhicks

From the fix's commit message, "This problem exists since the clone
ioctl was added ...". BTRFS_IOC_CLONE was added by f2eb0a24.

Priority

Cvss 3 Severity Score

4.0

Score breakdown

Status

Package	Release	Status
linux Launchpad, Ubuntu, Debian	precise	Released (3.2.0-98.138)
	trusty	Released (3.13.0-77.121)
	vivid	Released (3.19.0-49.55)
	wily	Released (4.2.0-27.32)
	xenial	Not vulnerable (4.3.0-1.10)
	yakkety	Not vulnerable (4.4.0-21.37)
	zesty	Not vulnerable (4.8.0-22.24)
	upstream	Released (4.4~rc1)
	Patches: Introduced by f2eb0a241f0e5c135d93243b0236cb1f14c305e0 Fixed by 0305cd5f7fca85dae392b9ba85b116896eb7c1c7
linux-armadaxp Launchpad, Ubuntu, Debian	precise	Released (3.2.0-1661.85)
	trusty	Does not exist
	upstream	Released (4.4~rc1)
	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 (4.4~rc1)
	xenial	Not vulnerable (4.4.0-1001.10)
	yakkety	Does not exist
	zesty	Does not exist
linux-ec2 Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Does not exist
	vivid	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	zesty	Does not exist
	upstream	Released (4.4~rc1)
linux-flo Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Does not exist (trusty was ignored)
	upstream	Released (4.4~rc1)
	vivid	Ignored (end of life)
	wily	Ignored (end of life)
	xenial	Ignored (abandoned)
	yakkety	Ignored (end of life)
	zesty	Does not exist
linux-fsl-imx51 Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Does not exist
	vivid	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	zesty	Does not exist
	upstream	Released (4.4~rc1)
linux-gke Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.4~rc1)
	xenial	Not vulnerable (4.4.0-1003.3)
	yakkety	Does not exist
	zesty	Does not exist
linux-goldfish Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Does not exist (trusty was ignored)
	upstream	Released (4.4~rc1)
	vivid	Ignored (end of life)
	wily	Ignored (end of life)
	xenial	Ignored (abandoned)
	yakkety	Ignored (end of life)
	zesty	Ignored (end of life)
linux-grouper Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Does not exist (trusty was ignored)
	upstream	Released (4.4~rc1)
	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 (4.4~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 (4.4~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	precise	Ignored (end of life)
	trusty	Does not exist
	vivid	Does not exist
	wily	Does not exist
	xenial	Does not exist
	yakkety	Does not exist
	zesty	Does not exist
	upstream	Released (4.4~rc1)
linux-linaro-shared Launchpad, Ubuntu, Debian	precise	Ignored (end of life)
	trusty	Does not exist
	upstream	Released (4.4~rc1)
	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	precise	Ignored (end of life)
	trusty	Does not exist
	upstream	Released (4.4~rc1)
	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	precise	Ignored (end of life, was needs-triage)
	trusty	Does not exist
	upstream	Released (4.4~rc1)
	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	precise	Ignored (end of life)
	trusty	Does not exist
	upstream	Released (4.4~rc1)
	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	precise	Ignored (end of life, was needs-triage)
	trusty	Does not exist
	upstream	Released (4.4~rc1)
	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	precise	Released (3.13.0-77.121~precise1)
	trusty	Does not exist
	upstream	Released (4.4~rc1)
	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	precise	Does not exist
	trusty	Released (3.16.0-60.80~14.04.1)
	upstream	Released (4.4~rc1)
	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	precise	Does not exist
	trusty	Released (3.19.0-49.55~14.04.1)
	upstream	Released (4.4~rc1)
	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	Released (4.2.0-27.32~14.04.1)
	upstream	Released (4.4~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 (4.4~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	precise	Does not exist
	trusty	Does not exist (trusty was ignored)
	upstream	Released (4.4~rc1)
	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	precise	Does not exist
	trusty	Does not exist (trusty was ignored)
	upstream	Released (4.4~rc1)
	vivid	Ignored (end of life)
	wily	Ignored (end of life)
	xenial	Ignored (abandoned)
	yakkety	Ignored (end of life)
	zesty	Does not exist
linux-manta Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Does not exist (trusty was ignored)
	upstream	Released (4.4~rc1)
	vivid	Ignored (end of life)
	wily	Ignored (end of life)
	xenial	Does not exist
	yakkety	Does not exist
	zesty	Does not exist
linux-mvl-dove Launchpad, Ubuntu, Debian	precise	Does not exist
	trusty	Does not exist
	upstream	Released (4.4~rc1)
	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	precise	Ignored (end of life)
	trusty	Does not exist
	upstream	Released (4.4~rc1)
	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 (4.4~rc1)
	vivid	Does not exist
	wily	Released (4.2.0-1022.29)
	xenial	Not vulnerable (4.3.0-1006.6)
	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 (4.4~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	precise	Released (3.2.0-1476.99)
	trusty	Does not exist
	upstream	Released (4.4~rc1)
	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	4.0
Attack vector	Local
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	Low
Integrity impact	None
Availability impact	None
Vector	CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

References

Bugs

https://launchpad.net/bugs/1521273

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