Information disclosure in Linux kernel - CVE-2019-11833

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Main Vulnerability Database Vulnerabilities #VU18533

Information disclosure in Linux kernel - CVE-2019-11833

Published: May 20, 2019 / Updated: May 30, 2020


Vulnerability identifier: #VU18533
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2019-11833
CWE-ID: CWE-200
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to gain access to potentially sensitive information.

The vulnerability exists due to the Linux kernel does not zero out the unused memory region in the extent tree block within the fs/ext4/extents.c. A local user can gain unauthorized access to sensitive information on the system.


Affected software

Linux kernel
Red Hat Enterprise Linux for Real Time for NFV
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for Scientific Computing
Red Hat Enterprise Linux for Power, big endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux for Real Time
Fedora

kernel (Red Hat package)
kernel-rt (Red Hat package)
kernel
kernel-headers
kernel-tools
Red Hat Virtualization Host

How to mitigate CVE-2019-11833

Install updates from vendor's website.

Linux kernel - addressed in versions 4.4.181, 4.9.178, 4.14.121, 4.19.45, 5.2
kernel (Red Hat package) - update to 3.10.0-1062.el7
kernel-rt (Red Hat package) - addressed in versions 3.10.0-1062.rt56.1022.el7, 4.18.0-147.rt24.93.el8
kernel - addressed in versions 5.0.18-100.fc28, 5.0.18-200.fc29, 5.0.19-200.fc29
kernel-headers - addressed in versions 5.0.18-100.fc28, 5.0.18-200.fc29, 5.0.19-200.fc29
kernel-tools - update to 5.0.19-200.fc29

External References

Related Security Bulletins