Improper input validation in Linux kernel - CVE-2015-7872

Vulnerability identifier: #VU2510

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-2015-7872

CWE-ID: CWE-20

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 key_gc_unused_keys function in security/keys/gc.c due to improper input validation. A local attacker can submit specially crafted keyctl commands and cause the service to crash.

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

Virtualization Performance Viewer
MRG Realtime
kernel (Red Hat package)
kernel-rt (Red Hat package)
linux-grsec (Alpine package)

Update to version 4.2.7.

kernel (Red Hat package) - addressed in versions 2.6.32-573.12.1.el6, 3.10.0-327.10.1.el7
kernel-rt (Red Hat package) - addressed in versions 3.10.0-327.rt56.171.el6rt, 3.10.0-327.10.1.rt56.211.el7_2

• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f05819df10d7b09f6d1eb6f8534a8f68e5a4fe61

• Ubuntu update for Linux kernel (OMAP4)
• Ubuntu update for Linux kernel
• Ubuntu update for Linux kernel (Utopic HWE)
• Amazon Linux AMI update for kernel
• Red Hat update for kernel-rt
• Red Hat update for kernel-rt
• Red Hat update for kernel
• Red Hat update for kernel
• Improper input validation in linux-grsec (Alpine package)
• Improper input validation in HPE Virtualization Performance Viewer