Use-after-free error in Linux kernel - CVE-2017-8824

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Main Vulnerability Database Vulnerabilities #VU9767

Use-after-free error in Linux kernel - CVE-2017-8824

Published: December 26, 2017 / Updated: June 17, 2021


Vulnerability identifier: #VU9767
CSH Severity: Low
CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2017-8824
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability: Public exploit is available

Vulnerability details

The vulnerability allows a local attacker to gain elevated privileges or cause DoS condition on the target system.

The weakness exists due to an error in the dccp_disconnect function in net/dccp/proto.c in the Linux kernel. A local attacker can make specially crafted AF_UNSPEC connect system call during the DCCP_LISTEN state, trigger use-after-free error and gain root privileges or cause the system to crash.

Affected software

Linux kernel
Debian Linux
Arch Linux
Amazon Linux AMI
Red Hat Enterprise Linux Server - Extended Life Cycle Support
Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems)
Red Hat Enterprise Linux for IBM z Systems
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 Desktop
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux for Real Time for NFV
Red Hat Enterprise Linux for Real Time
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux Server - 4 Year Extended Update Support
Red Hat Enterprise Linux Server (for IBM Power LE) - 4 Year Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux EUS Compute Node
Red Hat Enterprise Linux for Power, big endian - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux Server - Extended Update Support
SUSE Linux
Ubuntu
Fedora

MRG Realtime
kernel (Red Hat package)
kernel-rt (Red Hat package)
Red Hat Enterprise Linux Server for x86_64 - Update Services for SAP Solutions
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
kernel
Red Hat Virtualization Host

How to mitigate CVE-2017-8824

Update to version 4.14.3.

kernel (Red Hat package) - addressed in versions 3.10.0-327.66.1.el7, 3.10.0-514.44.1.el7, 3.10.0-693.25.2.el7, 3.10.0-862.el7
kernel-rt (Red Hat package) - addressed in versions 3.10.0-693.25.2.rt56.612.el6rt, 3.10.0-862.rt56.804.el7
kernel - addressed in versions 4.14.6-200.fc26, 4.14.6-300.fc27

Links to Public Exploits and PoC-codes

External References

Related Security Bulletins