Improper check or handling of exceptional conditions in Linux kernel and Xen - CVE-2015-5307

Vulnerability identifier: #VU3355

CSH Severity: Low

CVSS v4: 7.1 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2015-5307

CWE-ID: CWE-703

Exploitation vector: Adjecent network

Exploit availability: No public exploit available

The vulnerability allows an adjacent attacker to cause DoS condition on the target system.

The weakness exists in the KVM subsystem due to many #AC (aka Alignment Check) exceptions, related to svm.c and vmx.c. An adjacent attacker can cause the service to crash.

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

kernel (Red Hat package)
xen (Alpine package)
kernel
xen
IBM Systems Director

Update Linux Kernel to 4.2.7 or Xen to 4.7.

kernel (Red Hat package) - addressed in versions 2.6.32-573.12.1.el6, 3.10.0-327.3.1.el7
xen (Alpine package) - update to 4.4.2-r4
kernel - addressed in versions 4.1.13-100.fc21, 4.2.6-200.fc22, 4.2.6-300.fc23
xen - addressed in versions 4.4.3-8.fc21, 4.5.2-2.fc22, 4.5.2-2.fc23

• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=54a20552e1eae07aa240fa...

• Ubuntu update for Linux kernel (Wily HWE)
• Ubuntu update for Linux kernel
• Ubuntu update for Linux kernel
• Ubuntu update for Linux kernel
• Ubuntu update for Linux kernel
• Ubuntu update for Linux kernel (Trusty HWE)
• Ubuntu update for Linux kernel (Utopic HWE)
• Ubuntu update for Linux kernel (Vivid HWE)
• Red Hat update for kernel
• Red Hat update for kernel
• Improper check or handling of exceptional conditions in xen (Alpine package)
• Fedora 23 update for xen
• Fedora 22 update for xen
• Fedora 21 update for xen
• Fedora 23 update for kernel
• Fedora 22 update for kernel
• Fedora 21 update for kernel