CVE-2019-19036

Published: 21 November 2019

btrfs_root_node in fs/btrfs/ctree.c in the Linux kernel through 5.3.12 allows a NULL pointer dereference because rcu_dereference(root->node) can be zero.

From the Ubuntu security team

It was discovered that the btrfs file system implementation in the Linux kernel did not properly validate file system metadata in some situations. An attacker could use this to construct a malicious btrfs image that, when mounted, could cause a denial of service (system crash).

Priority

CVSS 3 base score: 5.5

Status

Package	Release	Status
linux Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-109.110)
	disco	Ignored (reached end-of-life)
	eoan	Released (5.3.0-22.24)
	focal	Not vulnerable (5.4.0-9.12)
	groovy	Not vulnerable (5.4.0-26.30)
	hirsute	Not vulnerable (5.8.0-36.40+21.04.1)
	precise	Ignored (was needs-triage ESM criteria)
	trusty	Ignored (was needs-triage ESM criteria)
	upstream	Released (5.4~rc1)
	xenial	Ignored (was needed now end-of-life)
linux-aws Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1077.81)
	disco	Ignored (reached end-of-life)
	eoan	Released (5.3.0-1007.8)
	focal	Not vulnerable (5.4.0-1005.5)
	groovy	Not vulnerable (5.4.0-1009.9)
	hirsute	Not vulnerable (5.8.0-1018.20+21.04.1)
	precise	Does not exist
	trusty	Ignored (was needs-triage ESM criteria)
	upstream	Released (5.4~rc1)
	xenial	Ignored (was needed now end-of-life)
linux-aws-5.0 Launchpad, Ubuntu, Debian	bionic	Ignored (was needs-triage now end-of-life)
	disco	Does not exist
	eoan	Does not exist
	focal	Does not exist
	groovy	Does not exist
	hirsute	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (5.4~rc1)
	xenial	Does not exist
linux-aws-5.3 Launchpad, Ubuntu, Debian	bionic	Not vulnerable (5.3.0-1016.17~18.04.1)
	eoan	Does not exist
	focal	Does not exist
	groovy	Does not exist
	hirsute	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (5.4~rc1)
	xenial	Does not exist
linux-aws-5.4 Launchpad, Ubuntu, Debian	bionic	Not vulnerable (5.4.0-1018.18~18.04.1)
	focal	Does not exist
	groovy	Does not exist
	hirsute	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (5.4~rc1)
	xenial	Does not exist
linux-aws-hwe Launchpad, Ubuntu, Debian	bionic	Does not exist
	disco	Does not exist
	eoan	Does not exist
	focal	Does not exist
	groovy	Does not exist
	hirsute	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (5.4~rc1)
	xenial	Released (4.15.0-1079.83~16.04.1)
linux-azure Launchpad, Ubuntu, Debian	bionic	Ignored (was needs-triage now end-of-life)
	disco	Ignored (reached end-of-life)
	eoan	Released (5.3.0-1007.8)
	focal	Not vulnerable (5.4.0-1006.6)
	groovy	Not vulnerable (5.4.0-1010.10)
	hirsute	Not vulnerable (5.8.0-1016.17+21.04.1)
	precise	Does not exist
	trusty	Released (4.15.0-1091.101~14.04.1)
	upstream	Released (5.4~rc1)
	xenial	Released (4.15.0-1091.101~16.04.1)
linux-azure-4.15 Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1091.101)
	eoan	Does not exist
	focal	Does not exist
	groovy	Does not exist
	hirsute	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (5.4~rc1)
	xenial	Does not exist
linux-azure-5.3 Launchpad, Ubuntu, Debian	bionic	Not vulnerable (5.3.0-1007.8~18.04.1)
	eoan	Does not exist
	focal	Does not exist
	groovy	Does not exist
	hirsute	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (5.4~rc1)
	xenial	Does not exist
linux-azure-5.4 Launchpad, Ubuntu, Debian	bionic	Not vulnerable (5.4.0-1020.20~18.04.1)
	focal	Does not exist
	groovy	Does not exist
	hirsute	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (5.4~rc1)
	xenial	Does not exist
linux-azure-edge Launchpad, Ubuntu, Debian	bionic	Ignored (was needs-triage now end-of-life)
	disco	Does not exist
	eoan	Does not exist
	focal	Does not exist
	groovy	Does not exist
	hirsute	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (5.4~rc1)
	xenial	Does not exist
linux-dell300x Launchpad, Ubuntu, Debian	bionic	Not vulnerable (4.15.0-1005.8)
	focal	Does not exist
	groovy	Does not exist
	hirsute	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (5.4~rc1)
	xenial	Does not exist
linux-gcp Launchpad, Ubuntu, Debian	bionic	Ignored (was needs-triage now end-of-life)
	disco	Ignored (reached end-of-life)
	eoan	Released (5.3.0-1008.9)
	focal	Not vulnerable (5.4.0-1005.5)
	groovy	Not vulnerable (5.4.0-1009.9)
	hirsute	Not vulnerable (5.8.0-1015.15+21.04.1)
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (5.4~rc1)
	xenial	Released (4.15.0-1080.90~16.04.1)
linux-gcp-4.15 Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1080.90)
	eoan	Does not exist
	focal	Does not exist
	groovy	Does not exist
	hirsute	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (5.4~rc1)
	xenial	Does not exist
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
	focal	Does not exist
	groovy	Does not exist
	hirsute	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (5.4~rc1)
	xenial	Does not exist
linux-gcp-5.4 Launchpad, Ubuntu, Debian	bionic	Not vulnerable (5.4.0-1019.19~18.04.2)
	focal	Does not exist
	groovy	Does not exist
	hirsute	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (5.4~rc1)
	xenial	Does not exist
linux-gcp-edge Launchpad, Ubuntu, Debian	bionic	Ignored (was needs-triage now end-of-life)
	disco	Does not exist
	eoan	Does not exist
	focal	Does not exist
	groovy	Does not exist
	hirsute	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (5.4~rc1)
	xenial	Does not exist
linux-gke-4.15 Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1066.69)
	disco	Does not exist
	eoan	Does not exist
	focal	Does not exist
	groovy	Does not exist
	hirsute	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (5.4~rc1)
	xenial	Does not exist
linux-gke-5.0 Launchpad, Ubuntu, Debian	bionic	Released (5.0.0-1045.46)
	disco	Does not exist
	eoan	Does not exist
	focal	Does not exist
	groovy	Does not exist
	hirsute	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (5.4~rc1)
	xenial	Does not exist
linux-gke-5.3 Launchpad, Ubuntu, Debian	bionic	Not vulnerable (5.3.0-1011.12~18.04.1)
	eoan	Does not exist
	focal	Does not exist
	groovy	Does not exist
	hirsute	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (5.4~rc1)
	xenial	Does not exist
linux-gke-5.4 Launchpad, Ubuntu, Debian	bionic	Not vulnerable (5.4.0-1025.25~18.04.1)
	focal	Does not exist
	groovy	Does not exist
	hirsute	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (5.4~rc1)
	xenial	Does not exist
linux-gkeop Launchpad, Ubuntu, Debian	bionic	Does not exist
	focal	Not vulnerable (5.4.0-1008.9)
	groovy	Does not exist
	hirsute	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (5.4~rc1)
	xenial	Does not exist
linux-gkeop-5.4 Launchpad, Ubuntu, Debian	bionic	Not vulnerable (5.4.0-1001.1)
	focal	Does not exist
	groovy	Does not exist
	hirsute	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (5.4~rc1)
	xenial	Does not exist
linux-hwe Launchpad, Ubuntu, Debian	bionic	Released (5.3.0-26.28~18.04.1)
	disco	Does not exist
	eoan	Does not exist
	focal	Does not exist
	groovy	Does not exist
	hirsute	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (5.4~rc1)
	xenial	Released (4.15.0-112.113~16.04.1)
linux-hwe-5.4 Launchpad, Ubuntu, Debian	bionic	Not vulnerable (5.4.0-37.41~18.04.1)
	focal	Does not exist
	groovy	Does not exist
	hirsute	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (5.4~rc1)
	xenial	Does not exist
linux-hwe-5.8 Launchpad, Ubuntu, Debian	bionic	Does not exist
	focal	Not vulnerable (5.8.0-23.24~20.04.1)
	groovy	Does not exist
	hirsute	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (5.4~rc1)
	xenial	Does not exist
linux-hwe-edge Launchpad, Ubuntu, Debian	bionic	Ignored (was needs-triage now end-of-life)
	disco	Does not exist
	eoan	Does not exist
	focal	Does not exist
	groovy	Does not exist
	hirsute	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (5.4~rc1)
	xenial	Ignored (was needs-triage now end-of-life)
linux-kvm Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1069.70)
	disco	Ignored (reached end-of-life)
	eoan	Released (5.3.0-1007.8)
	focal	Not vulnerable (5.4.0-1004.4)
	groovy	Not vulnerable (5.4.0-1009.9)
	hirsute	Not vulnerable (5.8.0-1010.11+21.04.1)
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (5.4~rc1)
	xenial	Ignored (was needed now end-of-life)
linux-lts-trusty Launchpad, Ubuntu, Debian	bionic	Does not exist
	disco	Does not exist
	eoan	Does not exist
	focal	Does not exist
	groovy	Does not exist
	hirsute	Does not exist
	precise	Ignored (was needs-triage ESM criteria)
	trusty	Does not exist
	upstream	Released (5.4~rc1)
	xenial	Does not exist
linux-lts-xenial Launchpad, Ubuntu, Debian	bionic	Does not exist
	disco	Does not exist
	eoan	Does not exist
	focal	Does not exist
	groovy	Does not exist
	hirsute	Does not exist
	precise	Does not exist
	trusty	Ignored (was needs-triage ESM criteria)
	upstream	Released (5.4~rc1)
	xenial	Does not exist
linux-oem Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1091.101)
	disco	Ignored (reached end-of-life)
	eoan	Ignored (reached end-of-life)
	focal	Does not exist
	groovy	Does not exist
	hirsute	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (5.4~rc1)
	xenial	Ignored (was needs-triage now end-of-life)
linux-oem-5.10 Launchpad, Ubuntu, Debian	bionic	Does not exist
	focal	Not vulnerable (5.10.0-1008.9)
	groovy	Does not exist
	hirsute	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (5.4~rc1)
	xenial	Does not exist
linux-oem-5.6 Launchpad, Ubuntu, Debian	bionic	Does not exist
	eoan	Does not exist
	focal	Not vulnerable (5.6.0-1007.7)
	groovy	Does not exist
	hirsute	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (5.4~rc1)
	xenial	Does not exist
linux-oem-osp1 Launchpad, Ubuntu, Debian	bionic	Released (5.0.0-1065.70)
	disco	Ignored (reached end-of-life)
	eoan	Ignored (reached end-of-life)
	focal	Does not exist
	groovy	Does not exist
	hirsute	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (5.4~rc1)
	xenial	Does not exist
linux-oracle Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1048.52)
	disco	Ignored (reached end-of-life)
	eoan	Released (5.3.0-1006.7)
	focal	Not vulnerable (5.4.0-1005.5)
	groovy	Not vulnerable (5.4.0-1009.9)
	hirsute	Not vulnerable (5.8.0-1014.14+21.04.1)
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (5.4~rc1)
	xenial	Released (4.15.0-1050.54~16.04.1)
linux-oracle-5.0 Launchpad, Ubuntu, Debian	bionic	Ignored (was needs-triage now end-of-life)
	disco	Does not exist
	eoan	Does not exist
	focal	Does not exist
	groovy	Does not exist
	hirsute	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (5.4~rc1)
	xenial	Does not exist
linux-oracle-5.3 Launchpad, Ubuntu, Debian	bionic	Not vulnerable (5.3.0-1011.12~18.04.1)
	eoan	Does not exist
	focal	Does not exist
	groovy	Does not exist
	hirsute	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (5.4~rc1)
	xenial	Does not exist
linux-oracle-5.4 Launchpad, Ubuntu, Debian	bionic	Not vulnerable (5.4.0-1019.19~18.04.1)
	focal	Does not exist
	groovy	Does not exist
	hirsute	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (5.4~rc1)
	xenial	Does not exist
linux-raspi Launchpad, Ubuntu, Debian	bionic	Does not exist
	eoan	Does not exist
	focal	Not vulnerable (5.4.0-1007.7)
	groovy	Not vulnerable (5.4.0-1008.8)
	hirsute	Not vulnerable (5.8.0-1008.11+21.04.1)
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (5.4~rc1)
	xenial	Does not exist
linux-raspi-5.4 Launchpad, Ubuntu, Debian	bionic	Not vulnerable (5.4.0-1013.13~18.04.1)
	focal	Does not exist
	groovy	Does not exist
	hirsute	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (5.4~rc1)
	xenial	Does not exist
linux-raspi2 Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1065.69)
	disco	Ignored (reached end-of-life)
	eoan	Released (5.3.0-1012.14)
	focal	Ignored (was needs-triage now end-of-life)
	groovy	Does not exist
	hirsute	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (5.4~rc1)
	xenial	Ignored (was needed now end-of-life)
linux-raspi2-5.3 Launchpad, Ubuntu, Debian	bionic	Not vulnerable (5.3.0-1017.19~18.04.1)
	eoan	Does not exist
	focal	Does not exist
	groovy	Does not exist
	hirsute	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (5.4~rc1)
	xenial	Does not exist
linux-riscv Launchpad, Ubuntu, Debian	bionic	Does not exist
	eoan	Does not exist
	focal	Not vulnerable (5.4.0-24.28)
	groovy	Not vulnerable (5.4.0-24.28)
	hirsute	Not vulnerable (5.8.0-10.12+21.04.1)
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (5.4~rc1)
	xenial	Does not exist
linux-snapdragon Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1083.91)
	disco	Ignored (reached end-of-life)
	eoan	Does not exist
	focal	Does not exist
	groovy	Does not exist
	hirsute	Does not exist
	precise	Does not exist
	trusty	Does not exist
	upstream	Released (5.4~rc1)
	xenial	Ignored (was needed now end-of-life)

Notes

Author	Note
tyhicks	Exploiting this vulnerability requires a crafted filesystem image to be mounted
sbeattie	likely addressed by the btrfs write time tree-checker, which would mean it is addressed for kernels back through 4.4.x

References

Bugs

https://bugzilla.suse.com/show_bug.cgi?id=1157692

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