Null pointer dereference in Linux kernel - CVE-2019-16231

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Main Vulnerability Database Vulnerabilities #VU92783

Null pointer dereference in Linux kernel - CVE-2019-16231

Published: September 11, 2019 / Updated: May 4, 2020


Vulnerability identifier: #VU92783
CSH Severity: Low
CVSS v4: 5.6 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2019-16231
CWE-ID: CWE-476
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local privileged user to perform a denial of service (DoS) attack.

drivers/net/fjes/fjes_main.c in the Linux kernel 5.2.14 does not check the alloc_workqueue return value, leading to a NULL pointer dereference.


Affected software

Linux kernel
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 for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Red Hat CodeReady Linux Builder for x86_64
Red Hat CodeReady Linux Builder for Power, little endian
Red Hat CodeReady Linux Builder for ARM 64
Ubuntu
kernel (Red Hat package)
kernel-rt (Red Hat package)
linux-image-virtual-lts-xenial (Ubuntu package)
linux-image-lowlatency-lts-xenial (Ubuntu package)
linux-image-generic-lts-xenial (Ubuntu package)
linux-image-generic-lpae-lts-xenial (Ubuntu package)
linux-image-lowlatency (Ubuntu package)
linux-image-virtual (Ubuntu package)
linux-image-powerpc64-smp (Ubuntu package)
linux-image-powerpc64-emb (Ubuntu package)
linux-image-powerpc-smp (Ubuntu package)
linux-image-powerpc-e500mc (Ubuntu package)
linux-image-generic-lpae (Ubuntu package)
linux-image-generic (Ubuntu package)
linux-image-4.4.0-208-powerpc64-smp (Ubuntu package)
linux-image-4.4.0-208-powerpc64-emb (Ubuntu package)
linux-image-4.4.0-208-powerpc-smp (Ubuntu package)
linux-image-4.4.0-208-powerpc-e500mc (Ubuntu package)
linux-image-4.4.0-208-generic (Ubuntu package)
linux-image-4.4.0-208-lowlatency (Ubuntu package)
linux-image-4.4.0-208-generic-lpae (Ubuntu package)
linux-image-aws (Ubuntu package)
linux-image-4.4.0-1090-aws (Ubuntu package)
linux-image-kvm (Ubuntu package)
linux-image-4.4.0-1091-kvm (Ubuntu package)
linux-image-4.4.0-1126-aws (Ubuntu package)
linux-image-raspi2 (Ubuntu package)
linux-image-4.4.0-1150-raspi2 (Ubuntu package)
linux-image-snapdragon (Ubuntu package)
linux-image-4.4.0-1154-snapdragon (Ubuntu package)

How to mitigate CVE-2019-16231

Install update from vendor's repository.

kernel (Red Hat package) - addressed in versions 3.10.0-1160.el7, 4.18.0-240.el8
kernel-rt (Red Hat package) - update to 3.10.0-1160.rt56.1131.el7
linux-image-virtual-lts-xenial (Ubuntu package) - update to 4.4.0.208.181
linux-image-lowlatency-lts-xenial (Ubuntu package) - update to 4.4.0.208.181
linux-image-generic-lts-xenial (Ubuntu package) - update to 4.4.0.208.181
linux-image-generic-lpae-lts-xenial (Ubuntu package) - update to 4.4.0.208.181
linux-image-lowlatency (Ubuntu package) - update to 4.4.0.208.214
linux-image-virtual (Ubuntu package) - update to 4.4.0.208.214
linux-image-powerpc64-smp (Ubuntu package) - update to 4.4.0.208.214
linux-image-powerpc64-emb (Ubuntu package) - update to 4.4.0.208.214
linux-image-powerpc-smp (Ubuntu package) - update to 4.4.0.208.214
linux-image-powerpc-e500mc (Ubuntu package) - update to 4.4.0.208.214
linux-image-generic-lpae (Ubuntu package) - update to 4.4.0.208.214
linux-image-generic (Ubuntu package) - update to 4.4.0.208.214
linux-image-4.4.0-208-powerpc64-smp (Ubuntu package) - update to 4.4.0-208.240
linux-image-4.4.0-208-powerpc64-emb (Ubuntu package) - update to 4.4.0-208.240
linux-image-4.4.0-208-powerpc-smp (Ubuntu package) - update to 4.4.0-208.240
linux-image-4.4.0-208-powerpc-e500mc (Ubuntu package) - update to 4.4.0-208.240
linux-image-4.4.0-208-generic (Ubuntu package) - update to 4.4.0-208.240~14.04.1
linux-image-4.4.0-208-lowlatency (Ubuntu package) - update to 4.4.0-208.240~14.04.1
linux-image-4.4.0-208-generic-lpae (Ubuntu package) - update to 4.4.0-208.240~14.04.1
linux-image-aws (Ubuntu package) - addressed in versions 4.4.0.1090.87, 4.4.0.1126.131
linux-image-4.4.0-1090-aws (Ubuntu package) - update to 4.4.0-1090.94
linux-image-kvm (Ubuntu package) - update to 4.4.0.1091.89
linux-image-4.4.0-1091-kvm (Ubuntu package) - update to 4.4.0-1091.100
linux-image-4.4.0-1126-aws (Ubuntu package) - update to 4.4.0-1126.140
linux-image-raspi2 (Ubuntu package) - update to 4.4.0.1150.150
linux-image-4.4.0-1150-raspi2 (Ubuntu package) - update to 4.4.0-1150.161
linux-image-snapdragon (Ubuntu package) - update to 4.4.0.1154.146
linux-image-4.4.0-1154-snapdragon (Ubuntu package) - update to 4.4.0-1154.164

External References

Related Security Bulletins