CVE-2019-14284

Published: 26 July 2019

In the Linux kernel before 5.2.3, drivers/block/floppy.c allows a denial of service by setup_format_params division-by-zero. Two consecutive ioctls can trigger the bug: the first one should set the drive geometry with .sect and .rate values that make F_SECT_PER_TRACK be zero. Next, the floppy format operation should be called. It can be triggered by an unprivileged local user even when a floppy disk has not been inserted. NOTE: QEMU creates the floppy device by default.

From the Ubuntu Security Team

It was discovered that the floppy driver in the Linux kernel did not properly validate ioctl() calls, leading to a division-by-zero. A local attacker could use this to cause a denial of service (system crash).

Priority

Cvss 3 Severity Score

6.2

Score breakdown

Status

Package	Release	Status
linux-aws Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1047.49)
	disco	Released (5.0.0-1014.16)
	eoan	Not vulnerable (5.3.0-1003.3)
	trusty	Ignored (was needs-triage ESM criteria)
	upstream	Released (5.3~rc1)
	xenial	Released (4.4.0-1092.103)
linux-azure Launchpad, Ubuntu, Debian	bionic	Released (5.0.0-1018.19~18.04.1)
	trusty	Ignored (was needs-triage ESM criteria)
	upstream	Released (5.3~rc1)
	disco	Released (5.0.0-1018.19)
	eoan	Not vulnerable (5.0.0-1018.19)
	xenial	Released (4.15.0-1056.61)
linux-aws-5.0 Launchpad, Ubuntu, Debian	bionic	Not vulnerable (5.0.0-1021.24~18.04.1)
	disco	Does not exist
	eoan	Does not exist
	trusty	Does not exist
	upstream	Released (5.3~rc1)
	xenial	Does not exist
linux-aws-hwe Launchpad, Ubuntu, Debian	bionic	Does not exist
	disco	Does not exist
	eoan	Does not exist
	trusty	Does not exist
	upstream	Released (5.3~rc1)
	xenial	Released (4.15.0-1047.49~16.04.1)
linux-oem-5.4 Launchpad, Ubuntu, Debian	bionic	Does not exist
	eoan	Does not exist
	trusty	Does not exist
	upstream	Released (5.3~rc1)
	xenial	Does not exist
linux-oracle-5.0 Launchpad, Ubuntu, Debian	bionic	Not vulnerable (5.0.0-1007.12~18.04.1)
	disco	Does not exist
	eoan	Does not exist
	trusty	Does not exist
	xenial	Does not exist
	upstream	Released (5.3~rc1)
linux-raspi2-5.3 Launchpad, Ubuntu, Debian	eoan	Does not exist
	bionic	Not vulnerable (5.3.0-1017.19~18.04.1)
	trusty	Does not exist
	upstream	Released (5.3~rc1)
	xenial	Does not exist
linux Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-60.67)
	disco	Released (5.0.0-27.28)
	eoan	Not vulnerable (5.2.0-10.11)
	trusty	Ignored (was needs-triage ESM criteria)
	upstream	Released (5.3~rc1)
	xenial	Released (4.4.0-161.189)
	Patches: Introduced by 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Fixed by f3554aeb991214cbfafd17d55e2bfddb50282e32
linux-azure-5.3 Launchpad, Ubuntu, Debian	bionic	Not vulnerable (5.3.0-1007.8~18.04.1)
	disco	Does not exist
	eoan	Does not exist
	trusty	Does not exist
	upstream	Released (5.3~rc1)
	xenial	Does not exist
linux-azure-edge Launchpad, Ubuntu, Debian	bionic	Released (5.0.0-1018.19~18.04.1)
	disco	Does not exist
	eoan	Does not exist
	trusty	Does not exist
	upstream	Released (5.3~rc1)
	xenial	Released (4.15.0-1056.61)
linux-euclid Launchpad, Ubuntu, Debian	bionic	Does not exist
	disco	Does not exist
	eoan	Does not exist
	trusty	Does not exist
	upstream	Released (5.3~rc1)
	xenial	Ignored (end of life, was needs-triage)
linux-flo Launchpad, Ubuntu, Debian	bionic	Does not exist
	disco	Does not exist
	eoan	Does not exist
	trusty	Does not exist
	upstream	Released (5.3~rc1)
	xenial	Ignored (abandoned)
linux-gcp Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1042.45)
	disco	Released (5.0.0-1015.15)
	eoan	Not vulnerable (5.0.0-1015.15)
	trusty	Does not exist
	upstream	Released (5.3~rc1)
	xenial	Released (4.15.0-1041.43)
linux-gcp-5.3 Launchpad, Ubuntu, Debian	bionic	Not vulnerable (5.3.0-1008.9~18.04.1)
	disco	Does not exist
	eoan	Does not exist
	trusty	Does not exist
	upstream	Released (5.3~rc1)
	xenial	Does not exist
linux-gcp-edge Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1042.45)
	disco	Does not exist
	eoan	Does not exist
	trusty	Does not exist
	upstream	Released (5.3~rc1)
	xenial	Does not exist
linux-gke Launchpad, Ubuntu, Debian	bionic	Does not exist
	disco	Does not exist
	eoan	Does not exist
	trusty	Does not exist
	upstream	Released (5.3~rc1)
	xenial	Ignored (end of standard support)
linux-gke-4.15 Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1041.43)
	disco	Does not exist
	eoan	Does not exist
	trusty	Does not exist
	upstream	Released (5.3~rc1)
	xenial	Does not exist
linux-gke-5.0 Launchpad, Ubuntu, Debian	bionic	Released (5.0.0-1015.15~18.04.1)
	disco	Does not exist
	eoan	Does not exist
	trusty	Does not exist
	upstream	Released (5.3~rc1)
	xenial	Does not exist
linux-goldfish Launchpad, Ubuntu, Debian	bionic	Does not exist
	disco	Does not exist
	eoan	Does not exist
	trusty	Does not exist
	upstream	Released (5.3~rc1)
	xenial	Ignored (end of life)
linux-grouper Launchpad, Ubuntu, Debian	bionic	Does not exist
	disco	Does not exist
	eoan	Does not exist
	trusty	Does not exist
	upstream	Released (5.3~rc1)
	xenial	Does not exist
linux-hwe Launchpad, Ubuntu, Debian	bionic	Released (5.0.0-27.28~18.04.1)
	disco	Does not exist
	eoan	Does not exist
	trusty	Does not exist
	upstream	Released (5.3~rc1)
	xenial	Released (4.15.0-60.67~16.04.1)
linux-hwe-edge Launchpad, Ubuntu, Debian	bionic	Ignored (end of life, was pending)
	disco	Does not exist
	eoan	Does not exist
	trusty	Does not exist
	upstream	Released (5.3~rc1)
	xenial	Released (4.15.0-60.67~16.04.1)
linux-kvm Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1043.43)
	disco	Released (5.0.0-1015.16)
	eoan	Not vulnerable (5.0.0-1015.16)
	trusty	Does not exist
	upstream	Released (5.3~rc1)
	xenial	Released (4.4.0-1056.63)
linux-lts-trusty Launchpad, Ubuntu, Debian	bionic	Does not exist
	disco	Does not exist
	eoan	Does not exist
	trusty	Does not exist
	upstream	Released (5.3~rc1)
	xenial	Does not exist
linux-lts-utopic Launchpad, Ubuntu, Debian	bionic	Does not exist
	disco	Does not exist
	eoan	Does not exist
	trusty	Does not exist
	upstream	Released (5.3~rc1)
	xenial	Does not exist
linux-lts-vivid Launchpad, Ubuntu, Debian	bionic	Does not exist
	disco	Does not exist
	eoan	Does not exist
	trusty	Does not exist
	upstream	Released (5.3~rc1)
	xenial	Does not exist
linux-lts-wily Launchpad, Ubuntu, Debian	bionic	Does not exist
	disco	Does not exist
	eoan	Does not exist
	trusty	Does not exist
	upstream	Released (5.3~rc1)
	xenial	Does not exist
linux-lts-xenial Launchpad, Ubuntu, Debian	bionic	Does not exist
	disco	Does not exist
	eoan	Does not exist
	trusty	Ignored (was needs-triage ESM criteria)
	upstream	Released (5.3~rc1)
	xenial	Does not exist
linux-maguro Launchpad, Ubuntu, Debian	bionic	Does not exist
	disco	Does not exist
	eoan	Does not exist
	trusty	Does not exist
	upstream	Released (5.3~rc1)
	xenial	Does not exist
linux-mako Launchpad, Ubuntu, Debian	bionic	Does not exist
	disco	Does not exist
	eoan	Does not exist
	trusty	Does not exist
	upstream	Released (5.3~rc1)
	xenial	Ignored (abandoned)
linux-manta Launchpad, Ubuntu, Debian	bionic	Does not exist
	disco	Does not exist
	eoan	Does not exist
	trusty	Does not exist
	upstream	Released (5.3~rc1)
	xenial	Does not exist
linux-oem Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1056.65)
	disco	Ignored (end of life, was pending)
	eoan	Released (4.15.0-1059.68)
	trusty	Does not exist
	upstream	Released (5.3~rc1)
	xenial	Ignored (end of standard support, was needs-triage)
linux-oem-osp1 Launchpad, Ubuntu, Debian	bionic	Released (5.0.0-1020.22)
	disco	Ignored (end of life, was pending)
	eoan	Released (5.0.0-1022.24)
	trusty	Does not exist
	upstream	Released (5.3~rc1)
	xenial	Does not exist
linux-oracle Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1022.25)
	disco	Released (5.0.0-1004.8)
	eoan	Not vulnerable (5.3.0-1002.2)
	trusty	Does not exist
	upstream	Released (5.3~rc1)
	xenial	Released (4.15.0-1022.25~16.04.1)
linux-raspi2 Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1044.47)
	disco	Released (5.0.0-1015.15)
	eoan	Not vulnerable (5.0.0-1015.15)
	trusty	Does not exist
	upstream	Released (5.3~rc1)
	xenial	Released (4.4.0-1120.129)
linux-snapdragon Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1062.69)
	disco	Released (5.0.0-1019.20)
	eoan	Does not exist
	trusty	Does not exist
	upstream	Released (5.3~rc1)
	xenial	Released (4.4.0-1124.130)

Severity score breakdown

Parameter	Value
Base score	6.2
Attack vector	Local
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

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