Use-after-free in Linux kernel - CVE-2019-8912
Published: February 20, 2019
Vulnerability identifier: #VU17804
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2019-8912
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to the af_alg_release() function, as defined in the crypto/af_alg.c source code file of the affected software, fails to set a NULL value for a certain structure member. A local attacker can access the system and execute an application that submits malicious input to the affected software and trigger a use-after-free condition in the sockfs_setattr function, resulting in a DoS condition
Affected software
Linux kernel
Amazon Linux AMI
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power 9
Red Hat Enterprise Linux for IBM System z (Structure A)
Opensuse
Fedora
kernel-alt (Red Hat package)
kernel
kernel-headers
kernel-tools
Amazon Linux AMI
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power 9
Red Hat Enterprise Linux for IBM System z (Structure A)
Opensuse
Fedora
kernel-alt (Red Hat package)
kernel
kernel-headers
kernel-tools
How to mitigate CVE-2019-8912
Cybersecurity Help is currently unaware of any official solution to address the vulnerability.
kernel-alt (Red Hat package) - update to 4.14.0-115.17.1.el7a
kernel - addressed in versions 4.20.11-100.fc28, 4.20.11-200.fc29
kernel-headers - addressed in versions 4.20.11-100.fc28, 4.20.11-200.fc29
kernel-tools - addressed in versions 4.20.11-100.fc28, 4.20.11-200.fc29
kernel - addressed in versions 4.20.11-100.fc28, 4.20.11-200.fc29
kernel-headers - addressed in versions 4.20.11-100.fc28, 4.20.11-200.fc29
kernel-tools - addressed in versions 4.20.11-100.fc28, 4.20.11-200.fc29