CVE-2018-7757

Published: 8 March 2018

Memory leak in the sas_smp_get_phy_events function in drivers/scsi/libsas/sas_expander.c in the Linux kernel through 4.15.7 allows local users to cause a denial of service (memory consumption) via many read accesses to files in the /sys/class/sas_phy directory, as demonstrated by the /sys/class/sas_phy/phy-1:0:12/invalid_dword_count file.

From the Ubuntu Security Team

It was discovered that a memory leak existed in the SAS driver subsystem of the Linux kernel. A local attacker could use this to cause a denial of service (memory exhaustion).

Priority

Cvss 3 Severity Score

5.5

Score breakdown

Status

Package	Release	Status
linux-flo Launchpad, Ubuntu, Debian	bionic	Does not exist
	artful	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.16~rc1)
	xenial	Ignored (abandoned)
linux-lts-utopic Launchpad, Ubuntu, Debian	upstream	Released (4.16~rc1)
	bionic	Does not exist
	artful	Does not exist
	trusty	Does not exist (trusty was ignored [end of standard support])
	xenial	Does not exist
linux-lts-vivid Launchpad, Ubuntu, Debian	upstream	Released (4.16~rc1)
	bionic	Does not exist
	artful	Does not exist
	trusty	Ignored (end of life, was needs-triage)
	xenial	Does not exist
linux-lts-wily Launchpad, Ubuntu, Debian	bionic	Does not exist
	artful	Does not exist
	trusty	Does not exist (trusty was ignored [end of standard support])
	upstream	Released (4.16~rc1)
	xenial	Does not exist
linux-aws Launchpad, Ubuntu, Debian	upstream	Released (4.16~rc1)
	bionic	Not vulnerable (4.15.0-1003.3)
	artful	Does not exist
	trusty	Released (4.4.0-1022.22)
	xenial	Released (4.4.0-1060.69)
linux-hwe Launchpad, Ubuntu, Debian	upstream	Released (4.16~rc1)
	bionic	Not vulnerable
	artful	Does not exist
	trusty	Does not exist
	xenial	Released (4.15.0-24.26~16.04.1)
linux-hwe-edge Launchpad, Ubuntu, Debian	upstream	Released (4.16~rc1)
	bionic	Released (4.18.0-8.9~18.04.1)
	artful	Does not exist
	trusty	Does not exist
	xenial	Released (4.15.0-24.26~16.04.1)
linux-gke Launchpad, Ubuntu, Debian	upstream	Released (4.16~rc1)
	bionic	Does not exist
	artful	Does not exist
	trusty	Does not exist
	xenial	Ignored (end of standard support, was needed)
linux-azure Launchpad, Ubuntu, Debian	upstream	Released (4.16~rc1)
	bionic	Not vulnerable (4.15.0-1003.3)
	artful	Does not exist
	trusty	Not vulnerable (4.15.0-1023.24~14.04.1)
	xenial	Released (4.15.0-1013.13~16.04.2)
linux-gcp Launchpad, Ubuntu, Debian	upstream	Released (4.16~rc1)
	bionic	Not vulnerable (4.15.0-1003.3)
	artful	Does not exist
	trusty	Does not exist
	xenial	Released (4.15.0-1014.14~16.04.1)
linux-kvm Launchpad, Ubuntu, Debian	upstream	Released (4.16~rc1)
	bionic	Not vulnerable (4.15.0-1003.3)
	artful	Does not exist
	trusty	Does not exist
	xenial	Released (4.4.0-1026.31)
linux-euclid Launchpad, Ubuntu, Debian	upstream	Released (4.16~rc1)
	bionic	Does not exist
	artful	Does not exist
	trusty	Does not exist
	xenial	Ignored (was needed ESM criteria)
linux Launchpad, Ubuntu, Debian	artful	Released (4.13.0-46.51)
	bionic	Not vulnerable (4.15.0-12.13)
	trusty	Released (3.13.0-153.203)
	upstream	Released (4.16~rc1)
	xenial	Released (4.4.0-127.153)
	Patches: Introduced by 2908d778ab3e244900c310974e1fc1c69066e450 Fixed by 4a491b1ab11ca0556d2fda1ff1301e862a2d44c4
linux-armadaxp Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	trusty	Does not exist
	upstream	Released (4.16~rc1)
	xenial	Does not exist
	This package is not directly supported by the Ubuntu Security Team
linux-goldfish Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.16~rc1)
	xenial	Ignored (end of life, was needed)
linux-grouper Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.16~rc1)
	xenial	Does not exist
linux-linaro-omap Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	trusty	Does not exist
	upstream	Released (4.16~rc1)
	xenial	Does not exist
linux-linaro-shared Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	trusty	Does not exist
	upstream	Released (4.16~rc1)
	xenial	Does not exist
linux-linaro-vexpress Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	trusty	Does not exist
	upstream	Released (4.16~rc1)
	xenial	Does not exist
linux-lts-quantal Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	trusty	Does not exist
	upstream	Released (4.16~rc1)
	xenial	Does not exist
	This package is not directly supported by the Ubuntu Security Team
linux-lts-raring Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	trusty	Does not exist
	upstream	Released (4.16~rc1)
	xenial	Does not exist
linux-lts-saucy Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	trusty	Does not exist
	upstream	Released (4.16~rc1)
	xenial	Does not exist
	This package is not directly supported by the Ubuntu Security Team
linux-lts-trusty Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	trusty	Does not exist
	upstream	Released (4.16~rc1)
	xenial	Does not exist
linux-lts-xenial Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	trusty	Released (4.4.0-127.153~14.04.1)
	upstream	Released (4.16~rc1)
	xenial	Does not exist
linux-maguro Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.16~rc1)
	xenial	Does not exist
linux-mako Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.16~rc1)
	xenial	Ignored (abandoned)
linux-manta Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.16~rc1)
	xenial	Does not exist
linux-oem Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Not vulnerable (4.15.0-1002.3)
	trusty	Does not exist
	upstream	Released (4.16~rc1)
	xenial	Released (4.13.0-1031.35)
linux-qcm-msm Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	trusty	Does not exist
	upstream	Released (4.16~rc1)
	xenial	Does not exist
linux-raspi2 Launchpad, Ubuntu, Debian	artful	Released (4.13.0-1023.24)
	bionic	Not vulnerable (4.15.0-1006.7)
	trusty	Does not exist
	upstream	Released (4.16~rc1)
	xenial	Released (4.4.0-1090.98)
linux-snapdragon Launchpad, Ubuntu, Debian	artful	Released (4.4.0-1093.98)
	bionic	Not vulnerable
	trusty	Does not exist
	upstream	Released (4.16~rc1)
	xenial	Released (4.4.0-1093.98)
linux-ti-omap4 Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	trusty	Does not exist
	upstream	Released (4.16~rc1)
	xenial	Does not exist

Severity score breakdown

Parameter	Value
Base score	5.5
Attack vector	Local
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References

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