CVE-2018-10876

Published: 26 July 2018

A flaw was found in Linux kernel in the ext4 filesystem code. A use-after-free is possible in ext4_ext_remove_space() function when mounting and operating a crafted ext4 image.

From the Ubuntu Security Team

Wen Xu discovered that a use-after-free vulnerability existed in the ext4 filesystem implementation in the Linux kernel. An attacker could use this to construct a malicious ext4 image that, when mounted, could cause a denial of service (system crash) or possibly execute arbitrary code.

Notes

Author	Note
sbeattie	fs/ext4/balloc.c first issue in bugzilla report may require additional fix possible reproducer in bug report

Priority

Cvss 3 Severity Score

5.5

Score breakdown

Status

Package	Release	Status
linux-goldfish Launchpad, Ubuntu, Debian	cosmic	Does not exist
	disco	Does not exist
	artful	Does not exist
	bionic	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.18~rc4)
	xenial	Ignored (end of life)
linux-flo Launchpad, Ubuntu, Debian	upstream	Released (4.18~rc4)
	trusty	Does not exist (trusty was ignored [abandoned])
	xenial	Ignored (abandoned)
	artful	Does not exist
	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
linux-aws Launchpad, Ubuntu, Debian	upstream	Released (4.18~rc4)
	trusty	Released (4.4.0-1028.31)
	xenial	Released (4.4.0-1066.76)
	artful	Does not exist
	bionic	Released (4.15.0-1032.34)
	cosmic	Not vulnerable (4.18.0-1002.3)
	disco	Not vulnerable (4.18.0-1002.3)
linux-azure Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Released (4.15.0-1037.39)
	cosmic	Not vulnerable (4.18.0-1003.3)
	disco	Not vulnerable (4.18.0-1003.3)
	trusty	Released (4.15.0-1037.39~14.04.2)
	upstream	Released (4.18~rc4)
	xenial	Released (4.15.0-1037.39~16.04.1)
linux-aws-hwe Launchpad, Ubuntu, Debian	upstream	Released (4.18~rc4)
	trusty	Does not exist
	xenial	Released (4.15.0-1032.34~16.04.1)
	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
linux-oracle Launchpad, Ubuntu, Debian	trusty	Does not exist
	bionic	Released (4.15.0-1008.10)
	cosmic	Released (4.15.0-1008.10)
	disco	Not vulnerable (4.15.0-1008.10)
	upstream	Released (4.18~rc4)
	xenial	Released (4.15.0-1008.10~16.04.1)
linux Launchpad, Ubuntu, Debian	artful	Ignored (end of life)
	bionic	Released (4.15.0-44.47)
	cosmic	Not vulnerable (4.17.0-6.7)
	disco	Not vulnerable (4.18.0-10.11)
	trusty	Ignored (was needed ESM criteria)
	upstream	Released (4.18~rc4)
	xenial	Released (4.4.0-134.160)
	Patches: Introduced by 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Fixed by 8844618d8aa7a9973e7b527d038a2a589665002c
linux-azure-edge Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Released (4.15.0-1037.39)
	cosmic	Does not exist
	disco	Does not exist
	trusty	Does not exist
	upstream	Released (4.18~rc4)
	xenial	Released (4.15.0-1037.39~16.04.1)
linux-euclid Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
	trusty	Does not exist
	upstream	Released (4.18~rc4)
	xenial	Ignored (was needed ESM criteria)
linux-gcp Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Released (4.15.0-1027.28)
	cosmic	Not vulnerable (4.18.0-1002.3)
	disco	Not vulnerable (4.18.0-1002.3)
	trusty	Does not exist
	upstream	Released (4.18~rc4)
	xenial	Released (4.15.0-1027.28~16.04.1)
linux-gcp-edge Launchpad, Ubuntu, Debian	bionic	Not vulnerable (4.18.0-1004.5~18.04.1)
	cosmic	Does not exist
	disco	Does not exist
	trusty	Does not exist
	upstream	Released (4.18~rc4)
	xenial	Does not exist
linux-gke Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Not vulnerable
	cosmic	Does not exist
	disco	Does not exist
	trusty	Does not exist
	upstream	Released (4.18~rc4)
	xenial	Ignored (end of standard support)
linux-grouper Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.18~rc4)
	xenial	Does not exist
linux-hwe Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Not vulnerable (4.18.0-13.14~18.04.1)
	cosmic	Does not exist
	disco	Does not exist
	trusty	Does not exist
	upstream	Released (4.18~rc4)
	xenial	Released (4.15.0-45.48~16.04.1)
linux-hwe-edge Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Not vulnerable (5.0.0-15.16~18.04.1)
	cosmic	Does not exist
	disco	Does not exist
	trusty	Does not exist
	upstream	Released (4.18~rc4)
	xenial	Released (4.15.0-45.48~16.04.1)
linux-kvm Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Released (4.15.0-1029.29)
	cosmic	Not vulnerable (4.18.0-1002.2)
	disco	Not vulnerable (4.18.0-1003.3)
	trusty	Does not exist
	upstream	Released (4.18~rc4)
	xenial	Released (4.4.0-1032.38)
linux-lts-trusty Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
	trusty	Does not exist
	upstream	Released (4.18~rc4)
	xenial	Does not exist
linux-lts-utopic Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
	trusty	Ignored (end of life, was ignored)
	upstream	Released (4.18~rc4)
	xenial	Does not exist
linux-lts-vivid Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
	trusty	Ignored (end of life, was ignored)
	upstream	Released (4.18~rc4)
	xenial	Does not exist
linux-lts-wily Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
	trusty	Ignored (end of life, was ignored)
	upstream	Released (4.18~rc4)
	xenial	Does not exist
linux-lts-xenial Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
	trusty	Released (4.4.0-134.160~14.04.1)
	upstream	Released (4.18~rc4)
	xenial	Does not exist
linux-maguro Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.18~rc4)
	xenial	Does not exist
linux-mako Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.18~rc4)
	xenial	Ignored (abandoned)
linux-manta Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Does not exist
	cosmic	Does not exist
	disco	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.18~rc4)
	xenial	Does not exist
linux-oem Launchpad, Ubuntu, Debian	artful	Does not exist
	bionic	Released (4.15.0-1033.38)
	cosmic	Released (4.15.0-1033.38)
	disco	Not vulnerable (4.15.0-1033.38)
	trusty	Does not exist
	upstream	Released (4.18~rc4)
	xenial	Ignored (end of standard support, was needed)
linux-raspi2 Launchpad, Ubuntu, Debian	artful	Ignored (end of life)
	bionic	Released (4.15.0-1031.33)
	cosmic	Not vulnerable (4.18.0-1004.6)
	disco	Not vulnerable (4.18.0-1005.7)
	trusty	Does not exist
	upstream	Released (4.18~rc4)
	xenial	Released (4.4.0-1095.103)
linux-snapdragon Launchpad, Ubuntu, Debian	artful	Ignored (end of life)
	bionic	Released (4.15.0-1053.57)
	cosmic	Does not exist
	disco	Not vulnerable (5.0.0-1010.10)
	trusty	Does not exist
	upstream	Released (4.18~rc4)
	xenial	Released (4.4.0-1099.104)

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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