CVE-2019-19126

Publication date 19 November 2019

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

On the x86-64 architecture, the GNU C Library (aka glibc) before 2.31 fails to ignore the LD_PREFER_MAP_32BIT_EXEC environment variable during program execution after a security transition, allowing local attackers to restrict the possible mapping addresses for loaded libraries and thus bypass ASLR for a setuid program.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
eglibc	20.04 LTS focal	Not in release
	19.10 eoan	Not in release
	19.04 disco	Not in release
	18.04 LTS bionic	Not in release
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not affected
glibc	20.04 LTS focal	Not affected
	19.10 eoan	Fixed 2.30-0ubuntu2.2
	19.04 disco	Ignored end of life
	18.04 LTS bionic	Fixed 2.27-3ubuntu1.2
	16.04 LTS xenial	Fixed 2.23-0ubuntu11.2
	14.04 LTS trusty	Not in release

Notes

sbeattie

introduced in b9eb92ab05204df772eb4929eccd018637c9f3e9, so glibc 2.23

Patch details

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

Package	Patch details
glibc	Upstream: https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=d5dfad4326fc683c813df1e37bbf5cf920591c8e

Severity score breakdown

Parameter	Value
Base score	3.3 · Low
Attack vector	Local
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	Low
Integrity impact	None
Availability impact	None
Vector	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

References

Related Ubuntu Security Notices (USN)

USN-4416-1
GNU C Library vulnerabilities
6 July 2020