Use-after-free in Linux kernel - CVE-2019-19447

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Main Vulnerability Database Vulnerabilities #VU34985

Use-after-free in Linux kernel - CVE-2019-19447

Published: December 8, 2019 / Updated: August 8, 2020


Vulnerability identifier: #VU34985
CSH Severity: High
CVSS v4: 8.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2019-19447
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.

In the Linux kernel 5.0.21, mounting a crafted ext4 filesystem image, performing some operations, and unmounting can lead to a use-after-free in ext4_put_super in fs/ext4/super.c, related to dump_orphan_list in fs/ext4/super.c.


Affected software

Linux kernel
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power 9
Red Hat Enterprise Linux for IBM System z (Structure A)
Red Hat Enterprise Linux for Real Time
Red Hat Enterprise Linux for Real Time for NFV
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux Server - AUS
Red Hat Virtualization Host - Extended Update Support 4.2 for RHEL
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for Power, big endian - Extended Update Support
Red Hat Enterprise Linux EUS Compute Node
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat CodeReady Linux Builder for ARM 64
Red Hat CodeReady Linux Builder for Power, little endian
Red Hat CodeReady Linux Builder for x86_64
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for x86_64
kernel (Red Hat package)
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
Red Hat Enterprise Linux Server for x86_64 - Update Services for SAP Solutions
kernel-rt (Red Hat package)
kernel-alt (Red Hat package)

How to mitigate CVE-2019-19447

Install update from vendor's website.

kernel (Red Hat package) - addressed in versions 3.10.0-693.81.1.el7, 3.10.0-957.65.1.el7, 3.10.0-1062.40.1.el7, 3.10.0-1160.el7, 4.18.0-240.el8
kernel-rt (Red Hat package) - update to 3.10.0-1160.rt56.1131.el7
kernel-alt (Red Hat package) - update to 4.14.0-115.21.2.el7a

External References

Related Security Bulletins