CVE-2018-18445

In the Linux kernel 4.14.x, 4.15.x, 4.16.x, 4.17.x, and 4.18.x before 4.18.13, faulty computation of numeric bounds in the BPF verifier permits out-of-bounds memory accesses because adjust_scalar_min_max_vals in kernel/bpf/verifier.c mishandles 32-bit right shifts.

From the Ubuntu Security Team

It was discovered that the BPF verifier in the Linux kernel did not correctly compute numeric bounds in some situations. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
linux	18.10 cosmic	Fixed 4.18.0-12.13
	18.04 LTS bionic	Fixed 4.15.0-43.46
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not affected
linux-aws	18.10 cosmic	Fixed 4.18.0-1006.7
	18.04 LTS bionic	Fixed 4.15.0-1031.33
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not affected
linux-aws-hwe	18.10 cosmic	Not in release
	18.04 LTS bionic	Not in release
	16.04 LTS xenial	Fixed 4.15.0-1031.33~16.04.1
	14.04 LTS trusty	Not in release
linux-azure	18.10 cosmic	Fixed 4.18.0-1006.6
	18.04 LTS bionic	Fixed 4.15.0-1036.38
	16.04 LTS xenial	Fixed 4.15.0-1036.38~16.04.1
	14.04 LTS trusty	Fixed 4.15.0-1036.38~14.04.2
linux-azure-edge	18.10 cosmic	Not in release
	18.04 LTS bionic	Fixed 4.15.0-1036.38
	16.04 LTS xenial	Fixed 4.15.0-1036.38~16.04.1
	14.04 LTS trusty	Not in release
linux-euclid	18.10 cosmic	Not in release
	18.04 LTS bionic	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
	16.04 LTS xenial	Ignored abandoned
	14.04 LTS trusty	Not in release
linux-gcp	18.10 cosmic	Fixed 4.18.0-1004.5
	18.04 LTS bionic	Fixed 4.15.0-1026.27
	16.04 LTS xenial	Fixed 4.15.0-1026.27~16.04.1
	14.04 LTS trusty	Not in release
linux-gcp-edge	18.10 cosmic	Not in release
	18.04 LTS bionic	Not affected
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not in release
linux-gke	18.10 cosmic	Not in release
	18.04 LTS bionic	Not in release
	16.04 LTS xenial	Ignored end of standard support
	14.04 LTS trusty	Not in release
linux-goldfish	18.10 cosmic	Not in release
	18.04 LTS bionic	Not in release
	16.04 LTS xenial	Ignored end of life
	14.04 LTS trusty	Not in release
linux-grouper	18.10 cosmic	Not in release
	18.04 LTS bionic	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
	16.04 LTS xenial	Fixed 4.15.0-43.46~16.04.1
	14.04 LTS trusty	Not in release
linux-hwe-edge	18.10 cosmic	Not in release
	18.04 LTS bionic	Not affected
	16.04 LTS xenial	Fixed 4.15.0-43.46~16.04.1
	14.04 LTS trusty	Not in release
linux-kvm	18.10 cosmic	Fixed 4.18.0-1005.5
	18.04 LTS bionic	Fixed 4.15.0-1028.28
	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
	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
	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
	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
	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
	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
	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
	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
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not in release
linux-oem	18.10 cosmic	Fixed 4.15.0-1030.35
	18.04 LTS bionic	Fixed 4.15.0-1030.35
	16.04 LTS xenial	Ignored end of standard support, was needs-triage
	14.04 LTS trusty	Not in release
linux-oracle	18.10 cosmic	Not affected
	18.04 LTS bionic	Not affected
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not in release
linux-raspi2	18.10 cosmic	Fixed 4.18.0-1007.9
	18.04 LTS bionic	Fixed 4.15.0-1030.32
	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
	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 468f6ea, fixed by b799207

Severity score breakdown

Parameter	Value
Base score	7.8 · High
Attack vector	Local
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

USN-3847-2
Linux kernel (HWE) vulnerabilities
20 December 2018

USN-3847-3
Linux kernel (Azure) vulnerabilities
20 December 2018

USN-3847-1
Linux kernel vulnerabilities
20 December 2018

USN-3835-1
Linux kernel vulnerabilities
3 December 2018

USN-3832-1
Linux kernel (AWS) vulnerabilities
30 November 2018