Improper input validation in Linux kernel - CVE-2017-15121

Vulnerability identifier: #VU12264

CSH Severity: Low

CVSS v4: 6.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2017-15121

CWE-ID: CWE-20

Exploitation vector: Local access

Exploit availability: No public exploit available

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

The weakness exists due to an application punches a hole in a file that does not end aligned to a page boundary. A local attacker can mount a fuse filesystem and cause the service to crash.

Linux kernel
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux for Real Time for NFV
Red Hat Enterprise Linux for Power, big endian
Red Hat Enterprise Linux for Scientific Computing
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for Real Time

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

Update to version 4.4.

kernel (Red Hat package) - update to 3.10.0-862.el7
kernel-rt (Red Hat package) - update to 3.10.0-862.rt56.804.el7

• https://bugzilla.redhat.com/show_bug.cgi?id=1520893

• Denial of service in Linux Kernel
• Red Hat update for kernel
• Red Hat update for kernel-rt