CVE-2019-13233

Published: 4 July 2019

In arch/x86/lib/insn-eval.c in the Linux kernel before 5.1.9, there is a use-after-free for access to an LDT entry because of a race condition between modify_ldt() and a #BR exception for an MPX bounds violation.

From the Ubuntu Security Team

Jann Horn discovered a use-after-free vulnerability in the Linux kernel when accessing LDT entries in some situations. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code.

Priority

Cvss 3 Severity Score

7.0

Score breakdown

Status

Package	Release	Status
linux Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-58.64)
	cosmic	Ignored (end of life)
	disco	Released (5.0.0-25.26)
	eoan	Not vulnerable (5.2.0-8.9)
	trusty	Ignored (was needs-triage ESM criteria)
	upstream	Released (5.2~rc4)
	xenial	Not vulnerable (4.2.0-16.19)
	Patches: Introduced by 670f928ba09b06712da34a3c44be6c8fa561fb19 Fixed by de9f869616dd95e95c00bdd6b0fcd3421e8a4323
linux-aws Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1047.49)
	cosmic	Ignored (end of life)
	disco	Released (5.0.0-1014.16)
	eoan	Not vulnerable (5.3.0-1003.3)
	trusty	Ignored (was needs-triage ESM criteria)
	upstream	Released (5.2~rc4)
	xenial	Not vulnerable (4.4.0-1001.10)
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 (5.2~rc4)
	xenial	Does not exist
linux-aws-hwe Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
	eoan	Does not exist
	trusty	Does not exist
	upstream	Released (5.2~rc4)
	xenial	Released (4.15.0-1047.49~16.04.1)
linux-azure Launchpad, Ubuntu, Debian	bionic	Released (5.0.0-1014.14~18.04.1)
	cosmic	Ignored (end of life)
	disco	Released (5.0.0-1014.14)
	eoan	Not vulnerable (5.0.0-1014.14)
	trusty	Ignored (was needs-triage ESM criteria)
	upstream	Released (5.2~rc4)
	xenial	Released (4.15.0-1055.60)
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 (5.2~rc4)
	xenial	Does not exist
linux-azure-edge Launchpad, Ubuntu, Debian	bionic	Released (5.0.0-1014.14~18.04.1)
	cosmic	Does not exist
	disco	Does not exist
	eoan	Does not exist
	trusty	Does not exist
	upstream	Released (5.2~rc4)
	xenial	Released (4.15.0-1055.60)
linux-euclid Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
	eoan	Does not exist
	trusty	Does not exist
	upstream	Released (5.2~rc4)
	xenial	Ignored (end of life, was needs-triage)
linux-flo Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
	eoan	Does not exist
	trusty	Does not exist
	upstream	Released (5.2~rc4)
	xenial	Ignored (abandoned)
linux-gcp Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1040.42)
	cosmic	Ignored (end of life)
	disco	Released (5.0.0-1013.13)
	eoan	Not vulnerable (5.0.0-1013.13)
	trusty	Does not exist
	upstream	Released (5.2~rc4)
	xenial	Released (4.15.0-1040.42~16.04.1)
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 (5.2~rc4)
	xenial	Does not exist
linux-gcp-edge Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1040.42)
	cosmic	Does not exist
	disco	Does not exist
	eoan	Does not exist
	trusty	Does not exist
	upstream	Released (5.2~rc4)
	xenial	Does not exist
linux-gke Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
	eoan	Does not exist
	trusty	Does not exist
	upstream	Released (5.2~rc4)
	xenial	Ignored (end of standard support)
linux-gke-4.15 Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1040.42)
	disco	Does not exist
	eoan	Does not exist
	trusty	Does not exist
	upstream	Released (5.2~rc4)
	xenial	Does not exist
linux-gke-5.0 Launchpad, Ubuntu, Debian	bionic	Not vulnerable (5.0.0-1013.13~18.04.1)
	disco	Does not exist
	eoan	Does not exist
	trusty	Does not exist
	upstream	Released (5.2~rc4)
	xenial	Does not exist
linux-goldfish Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
	eoan	Does not exist
	trusty	Does not exist
	upstream	Released (5.2~rc4)
	xenial	Ignored (end of life)
linux-grouper Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
	eoan	Does not exist
	trusty	Does not exist
	upstream	Released (5.2~rc4)
	xenial	Does not exist
linux-hwe Launchpad, Ubuntu, Debian	bionic	Released (5.0.0-25.26~18.04.1)
	cosmic	Does not exist
	disco	Does not exist
	eoan	Does not exist
	trusty	Does not exist
	upstream	Released (5.2~rc4)
	xenial	Released (4.15.0-58.64~16.04.1)
linux-hwe-edge Launchpad, Ubuntu, Debian	bionic	Ignored (end of life, was pending)
	cosmic	Does not exist
	disco	Does not exist
	eoan	Does not exist
	trusty	Does not exist
	upstream	Released (5.2~rc4)
	xenial	Released (4.15.0-58.64~16.04.1)
linux-kvm Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1042.42)
	cosmic	Ignored (end of life)
	disco	Released (5.0.0-1013.14)
	eoan	Not vulnerable (5.0.0-1013.14)
	trusty	Does not exist
	upstream	Released (5.2~rc4)
	xenial	Not vulnerable (4.4.0-1004.9)
linux-lts-trusty Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
	eoan	Does not exist
	trusty	Does not exist
	upstream	Released (5.2~rc4)
	xenial	Does not exist
linux-lts-utopic Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
	eoan	Does not exist
	trusty	Does not exist
	upstream	Released (5.2~rc4)
	xenial	Does not exist
linux-lts-vivid Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
	eoan	Does not exist
	trusty	Does not exist
	upstream	Released (5.2~rc4)
	xenial	Does not exist
linux-lts-wily Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
	eoan	Does not exist
	trusty	Does not exist
	upstream	Released (5.2~rc4)
	xenial	Does not exist
linux-lts-xenial Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
	eoan	Does not exist
	trusty	Ignored (was needs-triage ESM criteria)
	upstream	Released (5.2~rc4)
	xenial	Does not exist
linux-maguro Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
	eoan	Does not exist
	trusty	Does not exist
	upstream	Released (5.2~rc4)
	xenial	Does not exist
linux-mako Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
	eoan	Does not exist
	trusty	Does not exist
	upstream	Released (5.2~rc4)
	xenial	Ignored (abandoned)
linux-manta Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
	eoan	Does not exist
	trusty	Does not exist
	upstream	Released (5.2~rc4)
	xenial	Does not exist
linux-oem Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1050.57)
	cosmic	Ignored (end of life)
	disco	Released (4.15.0-1050.57)
	eoan	Released (4.15.0-1050.57)
	trusty	Does not exist
	upstream	Released (5.2~rc4)
	xenial	Ignored (end of standard support, was needs-triage)
linux-oem-5.4 Launchpad, Ubuntu, Debian	bionic	Does not exist
	eoan	Does not exist
	trusty	Does not exist
	upstream	Released (5.2~rc4)
	xenial	Does not exist
linux-oem-osp1 Launchpad, Ubuntu, Debian	bionic	Released (5.0.0-1018.20)
	disco	Ignored (end of life, was pending)
	eoan	Released (5.0.0-1018.20)
	trusty	Does not exist
	upstream	Released (5.2~rc4)
	xenial	Does not exist
linux-oracle Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1021.23)
	cosmic	Ignored (end of life)
	disco	Released (5.0.0-1004.8)
	eoan	Not vulnerable (5.3.0-1002.2)
	trusty	Does not exist
	upstream	Released (5.2~rc4)
	xenial	Released (4.15.0-1021.23~16.04.1)
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
	upstream	Released (5.2~rc4)
	xenial	Does not exist
linux-raspi2 Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1043.46)
	cosmic	Ignored (end of life)
	disco	Released (5.0.0-1014.14)
	eoan	Not vulnerable (5.0.0-1014.14)
	trusty	Does not exist
	upstream	Released (5.2~rc4)
	xenial	Not vulnerable (4.2.0-1013.19)
linux-raspi2-5.3 Launchpad, Ubuntu, Debian	bionic	Not vulnerable (5.3.0-1017.19~18.04.1)
	eoan	Does not exist
	trusty	Does not exist
	upstream	Released (5.2~rc4)
	xenial	Does not exist
linux-snapdragon Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1060.66)
	cosmic	Does not exist
	disco	Released (5.0.0-1018.19)
	eoan	Does not exist
	trusty	Does not exist
	upstream	Released (5.2~rc4)
	xenial	Not vulnerable (4.4.0-1012.12)

Severity score breakdown

Parameter	Value
Base score	7.0
Attack vector	Local
Attack complexity	High
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

References

Bugs

https://bugs.chromium.org/p/project-zero/issues/detail?id=1879

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