CVE-2019-18660

Published: 27 November 2019

The Linux kernel before 5.4.1 on powerpc allows Information Exposure because the Spectre-RSB mitigation is not in place for all applicable CPUs, aka CID-39e72bf96f58. This is related to arch/powerpc/kernel/entry_64.S and arch/powerpc/kernel/security.c.

From the Ubuntu Security Team

Anthony Steinhauser discovered that the Linux kernel did not properly perform Spectre_RSB mitigations to all processors for PowerPC architecture systems in some situations. A local attacker could use this to expose sensitive information.

Priority

Cvss 3 Severity Score

4.7

Score breakdown

Status

Package	Release	Status
linux Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-74.84)
	disco	Released (5.0.0-38.41)
	eoan	Released (5.3.0-26.28)
	focal	Not vulnerable (5.4.0-9.12)
	trusty	Ignored (was needs-triage ESM criteria)
	upstream	Released (5.5~rc1)
	xenial	Released (4.4.0-171.200)
	Patches: Introduced by 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Fixed by 39e72bf96f5847ba87cc5bd7a3ce0fed813dc9ad
linux-aws Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1057.59)
	disco	Released (5.0.0-1023.26)
	eoan	Released (5.3.0-1009.10)
	focal	Not vulnerable (5.4.0-1005.5)
	trusty	Released (4.4.0-1060.64) Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
	upstream	Released (5.5~rc1)
	xenial	Released (4.4.0-1100.111)
linux-aws-5.0 Launchpad, Ubuntu, Debian	bionic	Released (5.0.0-1023.26~18.04.1)
	disco	Does not exist
	eoan	Does not exist
	focal	Does not exist
	trusty	Does not exist
	upstream	Released (5.5~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
	trusty	Does not exist
	upstream	Released (5.5~rc1)
	xenial	Released (4.15.0-1057.59~16.04.1)
linux-azure Launchpad, Ubuntu, Debian	bionic	Released (5.0.0-1028.30~18.04.1)
	disco	Released (5.0.0-1028.30)
	eoan	Released (5.3.0-1009.10)
	focal	Not vulnerable (5.4.0-1006.6)
	trusty	Released (4.15.0-1066.71~14.04.1) Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
	upstream	Released (5.5~rc1)
	xenial	Released (4.15.0-1066.71)
linux-azure-5.3 Launchpad, Ubuntu, Debian	bionic	Released (5.3.0-1009.10~18.04.1)
	disco	Does not exist
	eoan	Does not exist
	focal	Does not exist
	trusty	Does not exist
	upstream	Released (5.5~rc1)
	xenial	Does not exist
linux-azure-edge Launchpad, Ubuntu, Debian	bionic	Ignored (end of life, was needs-triage)
	disco	Does not exist
	eoan	Does not exist
	focal	Does not exist
	trusty	Does not exist
	upstream	Released (5.5~rc1)
	xenial	Ignored (end of standard support, was needs-triage)
linux-gcp Launchpad, Ubuntu, Debian	bionic	Released (5.0.0-1028.29~18.04.1)
	disco	Released (5.0.0-1028.29)
	eoan	Released (5.3.0-1011.12)
	focal	Not vulnerable (5.4.0-1005.5)
	trusty	Does not exist
	upstream	Released (5.5~rc1)
	xenial	Released (4.15.0-1052.56)
linux-gcp-5.3 Launchpad, Ubuntu, Debian	bionic	Released (5.3.0-1010.11~18.04.1)
	disco	Does not exist
	eoan	Does not exist
	focal	Does not exist
	trusty	Does not exist
	upstream	Released (5.5~rc1)
	xenial	Does not exist
linux-gcp-edge Launchpad, Ubuntu, Debian	bionic	Ignored (end of life, was needs-triage)
	disco	Does not exist
	eoan	Does not exist
	focal	Does not exist
	trusty	Does not exist
	upstream	Released (5.5~rc1)
	xenial	Does not exist
linux-gke-4.15 Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1050.53)
	disco	Does not exist
	eoan	Does not exist
	focal	Does not exist
	trusty	Does not exist
	upstream	Released (5.5~rc1)
	xenial	Does not exist
linux-gke-5.0 Launchpad, Ubuntu, Debian	bionic	Released (5.0.0-1027.28~18.04.1)
	disco	Does not exist
	eoan	Does not exist
	focal	Does not exist
	trusty	Does not exist
	upstream	Released (5.5~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
	trusty	Does not exist
	upstream	Released (5.5~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
	trusty	Does not exist
	upstream	Released (5.5~rc1)
	xenial	Released (4.15.0-74.83~16.04.1)
linux-hwe-edge Launchpad, Ubuntu, Debian	bionic	Ignored (end of life, was needed)
	disco	Does not exist
	eoan	Does not exist
	focal	Does not exist
	trusty	Does not exist
	upstream	Released (5.5~rc1)
	xenial	Ignored (end of life, was needs-triage)
linux-kvm Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1052.52)
	disco	Released (5.0.0-1024.26)
	eoan	Released (5.3.0-1009.10)
	focal	Not vulnerable (5.4.0-1004.4)
	trusty	Does not exist
	upstream	Released (5.5~rc1)
	xenial	Released (4.4.0-1064.71)
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 (5.5~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
	trusty	Released (4.4.0-171.200~14.04.1) Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
	upstream	Released (5.5~rc1)
	xenial	Does not exist
linux-oem Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1066.76)
	disco	Ignored (end of life)
	eoan	Released (4.15.0-1066.76)
	focal	Does not exist
	trusty	Does not exist
	upstream	Released (5.5~rc1)
	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 (5.5~rc1)
	xenial	Does not exist
linux-oem-osp1 Launchpad, Ubuntu, Debian	bionic	Released (5.0.0-1033.38)
	disco	Ignored (end of life)
	eoan	Released (5.0.0-1033.38)
	focal	Does not exist
	trusty	Does not exist
	upstream	Released (5.5~rc1)
	xenial	Does not exist
linux-oracle Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1031.34)
	disco	Released (5.0.0-1009.14)
	eoan	Released (5.3.0-1008.9)
	focal	Not vulnerable (5.4.0-1005.5)
	trusty	Does not exist
	upstream	Released (5.5~rc1)
	xenial	Released (4.15.0-1031.34~16.04.1)
linux-oracle-5.0 Launchpad, Ubuntu, Debian	bionic	Released (5.0.0-1009.14~18.04.1)
	disco	Does not exist
	eoan	Does not exist
	focal	Does not exist
	trusty	Does not exist
	upstream	Released (5.5~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
	trusty	Does not exist
	upstream	Released (5.5~rc1)
	xenial	Does not exist
linux-raspi2 Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1053.57)
	disco	Released (5.0.0-1024.25)
	eoan	Released (5.3.0-1015.17)
	focal	Ignored (end of life, was needed)
	trusty	Does not exist
	upstream	Released (5.5~rc1)
	xenial	Released (4.4.0-1127.136)
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 (5.5~rc1)
	xenial	Does not exist
linux-snapdragon Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1070.77)
	disco	Ignored (end of life, was pending)
	eoan	Does not exist
	focal	Does not exist
	trusty	Does not exist
	upstream	Released (5.5~rc1)
	xenial	Released (4.4.0-1131.139)

Severity score breakdown

Parameter	Value
Base score	4.7
Attack vector	Local
Attack complexity	High
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	None
Availability impact	None
Vector	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

References

Bugs

https://bugs.launchpad.net/bugs/1853142

Join the discussion

Canonical is offering Expanded Security Maintenance

Canonical is offering Ubuntu Expanded Security Maintenance (ESM) for security fixes and essential packages.

Find out more about ESM ›