CVE-2019-15902

Published: 4 September 2019

A backporting error was discovered in the Linux stable/longterm kernel 4.4.x through 4.4.190, 4.9.x through 4.9.190, 4.14.x through 4.14.141, 4.19.x through 4.19.69, and 5.2.x through 5.2.11. Misuse of the upstream "x86/ptrace: Fix possible spectre-v1 in ptrace_get_debugreg()" commit reintroduced the Spectre vulnerability that it aimed to eliminate. This occurred because the backport process depends on cherry picking specific commits, and because two (correctly ordered) code lines were swapped.

From the Ubuntu Security Team

Brad Spengler discovered that a Spectre mitigation was improperly implemented in the ptrace susbsystem of the Linux kernel. A local attacker could possibly use this to expose sensitive information.

Priority

Cvss 3 Severity Score

5.6

Score breakdown

Status

Package	Release	Status
linux Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-66.75)
	disco	Released (5.0.0-32.34)
	eoan	Not vulnerable (5.0.0-13.14)
	focal	Not vulnerable (5.4.0-9.12)
	trusty	Ignored (was needs-triage ESM criteria)
	upstream	Released (2.6.12~rc2)
	xenial	Released (4.4.0-166.195)
	Patches: Introduced by local-2019-15902-break Fixed by local-2019-15902-fix
linux-aws Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1052.54)
	disco	Released (5.0.0-1019.21)
	eoan	Not vulnerable (5.0.0-1004.4)
	focal	Not vulnerable (5.4.0-1005.5)
	trusty	Released (4.4.0-1056.60) Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
	upstream	Released (2.6.12~rc2)
	xenial	Released (4.4.0-1096.107)
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
	focal	Does not exist
	trusty	Does not exist
	upstream	Released (2.6.12~rc2)
	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
	trusty	Does not exist
	upstream	Released (2.6.12~rc2)
	xenial	Released (4.15.0-1052.54~16.04.1)
linux-azure Launchpad, Ubuntu, Debian	bionic	Released (5.0.0-1023.24~18.04.1)
	disco	Released (5.0.0-1023.24)
	eoan	Not vulnerable (5.0.0-1004.4)
	focal	Not vulnerable (5.4.0-1006.6)
	trusty	Released (4.15.0-1061.66~14.04.1) Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
	upstream	Released (2.6.12~rc2)
	xenial	Released (4.15.0-1061.66)
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
	focal	Does not exist
	trusty	Does not exist
	upstream	Released (2.6.12~rc2)
	xenial	Does not exist
linux-azure-edge Launchpad, Ubuntu, Debian	bionic	Released (5.0.0-1023.24~18.04.1)
	disco	Does not exist
	eoan	Does not exist
	focal	Does not exist
	trusty	Does not exist
	upstream	Released (2.6.12~rc2)
	xenial	Released (4.15.0-1061.66)
linux-gcp Launchpad, Ubuntu, Debian	bionic	Released (5.0.0-1021.21~18.04.1)
	disco	Released (5.0.0-1021.21)
	eoan	Not vulnerable (5.0.0-1004.4)
	focal	Not vulnerable (5.4.0-1005.5)
	trusty	Does not exist
	upstream	Released (2.6.12~rc2)
	xenial	Released (4.15.0-1047.50)
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
	trusty	Does not exist
	upstream	Released (2.6.12~rc2)
	xenial	Does not exist
linux-gcp-edge Launchpad, Ubuntu, Debian	bionic	Released (5.0.0-1021.21~18.04.1)
	disco	Does not exist
	eoan	Does not exist
	focal	Does not exist
	trusty	Does not exist
	upstream	Released (2.6.12~rc2)
	xenial	Does not exist
linux-gke-4.15 Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1046.49)
	disco	Does not exist
	eoan	Does not exist
	focal	Does not exist
	trusty	Does not exist
	upstream	Released (2.6.12~rc2)
	xenial	Does not exist
linux-gke-5.0 Launchpad, Ubuntu, Debian	bionic	Released (5.0.0-1023.23~18.04.2)
	disco	Does not exist
	eoan	Does not exist
	focal	Does not exist
	trusty	Does not exist
	upstream	Released (2.6.12~rc2)
	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
	trusty	Does not exist
	upstream	Released (2.6.12~rc2)
	xenial	Does not exist
linux-hwe Launchpad, Ubuntu, Debian	bionic	Released (5.0.0-32.34~18.04.2)
	disco	Does not exist
	eoan	Does not exist
	focal	Does not exist
	trusty	Does not exist
	upstream	Released (2.6.12~rc2)
	xenial	Released (4.15.0-66.75~16.04.1)
linux-hwe-edge Launchpad, Ubuntu, Debian	bionic	Not vulnerable (5.0.0-15.16~18.04.1)
	disco	Does not exist
	eoan	Does not exist
	focal	Does not exist
	trusty	Does not exist
	upstream	Released (2.6.12~rc2)
	xenial	Released (4.15.0-66.75~16.04.1)
linux-kvm Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1048.48)
	disco	Released (5.0.0-1020.21)
	eoan	Not vulnerable (5.0.0-1004.4)
	focal	Not vulnerable (5.4.0-1004.4)
	trusty	Does not exist
	upstream	Released (2.6.12~rc2)
	xenial	Released (4.4.0-1060.67)
linux-lts-trusty Launchpad, Ubuntu, Debian	bionic	Does not exist
	disco	Does not exist
	eoan	Does not exist
	focal	Does not exist
	trusty	Does not exist
	upstream	Released (2.6.12~rc2)
	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
	trusty	Released (4.4.0-166.195~14.04.1) Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
	upstream	Released (2.6.12~rc2)
	xenial	Does not exist
linux-oem Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1059.68)
	disco	Ignored (end of life)
	eoan	Released (4.15.0-1059.68)
	focal	Does not exist
	trusty	Does not exist
	upstream	Released (2.6.12~rc2)
	xenial	Ignored (end of standard support, was needs-triage)
linux-oem-5.6 Launchpad, Ubuntu, Debian	bionic	Does not exist
	eoan	Does not exist
	focal	Not vulnerable (5.4.0-1002.4)
	trusty	Does not exist
	upstream	Released (2.6.12~rc2)
	xenial	Does not exist
linux-oem-osp1 Launchpad, Ubuntu, Debian	bionic	Released (5.0.0-1025.28)
	disco	Ignored (end of life, was pending)
	eoan	Not vulnerable (5.0.0-1010.11)
	focal	Does not exist
	trusty	Does not exist
	upstream	Released (2.6.12~rc2)
	xenial	Does not exist
linux-oracle Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1027.30)
	disco	Ignored (end of life, was pending)
	eoan	Not vulnerable (4.15.0-1011.13)
	focal	Not vulnerable (5.4.0-1005.5)
	trusty	Does not exist
	upstream	Released (2.6.12~rc2)
	xenial	Released (4.15.0-1027.30~16.04.1)
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
	focal	Does not exist
	trusty	Does not exist
	upstream	Released (2.6.12~rc2)
	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
	trusty	Does not exist
	upstream	Released (2.6.12~rc2)
	xenial	Does not exist
linux-raspi2 Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1049.53)
	disco	Released (5.0.0-1020.20)
	eoan	Not vulnerable (5.0.0-1006.6)
	focal	Not vulnerable (5.4.0-1004.4)
	trusty	Does not exist
	upstream	Released (2.6.12~rc2)
	xenial	Released (4.4.0-1124.133)
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
	trusty	Does not exist
	upstream	Released (2.6.12~rc2)
	xenial	Does not exist
linux-snapdragon Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1066.73)
	disco	Released (5.0.0-1024.25)
	eoan	Does not exist
	focal	Does not exist
	trusty	Does not exist
	upstream	Released (2.6.12~rc2)
	xenial	Released (4.4.0-1128.136)

Severity score breakdown

Parameter	Value
Base score	5.6
Attack vector	Local
Attack complexity	High
Privileges required	Low
User interaction	None
Scope	Changed
Confidentiality	High
Integrity impact	None
Availability impact	None
Vector	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N

References

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