Denial of service in Linux kernel - CVE-2017-7542

Vulnerability identifier: #VU10722

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-2017-7542

CWE-ID: CWE-190

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local attacker to cause DoS condition on the target system.

The weakness exists in the ip6_find_1stfragopt function in net/ipv6/output_core.c due to leveraging the ability to open a raw socket. A local attacker can trigger integer overflow and infinite loop and cause a denial of service.

Linux kernel
Amazon Linux AMI
Red Hat Enterprise Linux for Power, big endian
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux for Scientific Computing
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for Real Time for NFV
Red Hat Enterprise Linux for Real Time
Red Hat Enterprise Linux EUS Compute Node
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 Server - TUS
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
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 - AUS
Red Hat Enterprise Linux Server - Extended Update Support
Ubuntu
Fedora

MRG Realtime
kernel (Red Hat package)
kernel-rt (Red Hat package)
kernel
Red Hat Virtualization Host

Install update from vendor's website.

kernel (Red Hat package) - addressed in versions 2.6.32-696.20.1.el6, 3.10.0-693.5.2.el7
kernel-rt (Red Hat package) - addressed in versions 3.10.0-693.5.2.rt56.592.el6rt, 3.10.0-693.5.2.rt56.626.el7
kernel - addressed in versions 4.11.12-100.fc24, 4.11.12-200.fc25

• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6399f1fae4ec29fab5ec76...

• Ubuntu update for Linux kernel
• Ubuntu update for Linux kernel (Trusty HWE)
• Amazon Linux AMI update for kernel
• OpenSUSE Linux update for the Linux Kernel
• Red Hat update for kernel
• Red Hat update for kernel-rt
• Red Hat update for kernel
• Fedora 24 update for kernel
• Fedora 25 update for kernel
• Red Hat Enterprise MRG 2 update for kernel-rt