CVE-2018-10840

Linux kernel is vulnerable to a heap-based buffer overflow in the fs/ext4/xattr.c:ext4_xattr_set_entry() function. An attacker could exploit this by operating on a mounted crafted ext4 image.

From the Ubuntu Security Team

Wen Xu discovered that the XFS filesystem implementation in the Linux kernel did not properly validate xattr information. An attacker could use this to construct a malicious xfs image that, when mounted, could cause a denial of service (system crash) or possibly execute arbitrary code.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
linux	18.10 cosmic	Not affected
	18.04 LTS bionic	Fixed 4.15.0-33.36
	17.10 artful	Ignored end of life
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not affected
linux-aws	18.10 cosmic	Not affected
	18.04 LTS bionic	Fixed 4.15.0-1020.20
	17.10 artful	Not in release
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not affected
linux-azure	18.10 cosmic	Not affected
	18.04 LTS bionic	Fixed 4.15.0-1022.23
	17.10 artful	Not in release
	16.04 LTS xenial	Fixed 4.15.0-1022.22~16.04.1
	14.04 LTS trusty	Not affected
linux-azure-edge	18.10 cosmic	Not in release
	18.04 LTS bionic	Not affected
	17.10 artful	Not in release
	16.04 LTS xenial	Fixed 4.15.0-1022.23
	14.04 LTS trusty	Not in release
linux-euclid	18.10 cosmic	Not in release
	18.04 LTS bionic	Not in release
	17.10 artful	Not in release
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not in release
linux-flo	18.10 cosmic	Not in release
	18.04 LTS bionic	Not in release
	17.10 artful	Not in release
	16.04 LTS xenial	Ignored abandoned
	14.04 LTS trusty	Not in release
linux-gcp	18.10 cosmic	Not affected
	18.04 LTS bionic	Fixed 4.15.0-1018.19
	17.10 artful	Not in release
	16.04 LTS xenial	Fixed 4.15.0-1018.19~16.04.2
	14.04 LTS trusty	Not in release
linux-gke	18.10 cosmic	Not in release
	18.04 LTS bionic	Not in release
	17.10 artful	Not in release
	16.04 LTS xenial	Ignored end of standard support, was needs-triage
	14.04 LTS trusty	Not in release
linux-goldfish	18.10 cosmic	Not in release
	18.04 LTS bionic	Not in release
	17.10 artful	Not in release
	16.04 LTS xenial	Ignored end of life, was needs-triage
	14.04 LTS trusty	Not in release
linux-grouper	18.10 cosmic	Not in release
	18.04 LTS bionic	Not in release
	17.10 artful	Not in release
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not in release
linux-hwe	18.10 cosmic	Not in release
	18.04 LTS bionic	Not affected
	17.10 artful	Not in release
	16.04 LTS xenial	Fixed 4.15.0-33.36~16.04.1
	14.04 LTS trusty	Not in release
linux-hwe-edge	18.10 cosmic	Not in release
	18.04 LTS bionic	Not affected
	17.10 artful	Not in release
	16.04 LTS xenial	Fixed 4.15.0-33.36~16.04.1
	14.04 LTS trusty	Not in release
linux-kvm	18.10 cosmic	Not affected
	18.04 LTS bionic	Fixed 4.15.0-1020.20
	17.10 artful	Not in release
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not in release
linux-lts-trusty	18.10 cosmic	Not in release
	18.04 LTS bionic	Not in release
	17.10 artful	Not in release
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not in release
linux-lts-utopic	18.10 cosmic	Not in release
	18.04 LTS bionic	Not in release
	17.10 artful	Not in release
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not in release
linux-lts-vivid	18.10 cosmic	Not in release
	18.04 LTS bionic	Not in release
	17.10 artful	Not in release
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not in release
linux-lts-wily	18.10 cosmic	Not in release
	18.04 LTS bionic	Not in release
	17.10 artful	Not in release
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not in release
linux-lts-xenial	18.10 cosmic	Not in release
	18.04 LTS bionic	Not in release
	17.10 artful	Not in release
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not affected
linux-maguro	18.10 cosmic	Not in release
	18.04 LTS bionic	Not in release
	17.10 artful	Not in release
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not in release
linux-mako	18.10 cosmic	Not in release
	18.04 LTS bionic	Not in release
	17.10 artful	Not in release
	16.04 LTS xenial	Ignored abandoned
	14.04 LTS trusty	Not in release
linux-manta	18.10 cosmic	Not in release
	18.04 LTS bionic	Not in release
	17.10 artful	Not in release
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not in release
linux-oem	18.10 cosmic	Not affected
	18.04 LTS bionic	Fixed 4.15.0-1017.20
	17.10 artful	Not in release
	16.04 LTS xenial	Ignored end of standard support, was needed
	14.04 LTS trusty	Not in release
linux-raspi2	18.10 cosmic	Not affected
	18.04 LTS bionic	Fixed 4.15.0-1021.23
	17.10 artful	Ignored end of life
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not in release
linux-snapdragon	18.10 cosmic	Not in release
	18.04 LTS bionic	Not affected
	17.10 artful	Not affected
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not in release

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
linux	Introduced by dec214d, fixed by 8a2b307

Severity score breakdown

Parameter	Value
Base score	6.6 · Medium
Attack vector	Physical
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:P/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

USN-3752-2
Linux kernel (HWE) vulnerabilities
24 August 2018

USN-3752-1
Linux kernel vulnerabilities
24 August 2018

USN-3752-3
Linux kernel (Azure, GCP, OEM) vulnerabilities
28 August 2018