Synopsis
The remote Debian host is missing a security-related update.
Description
Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation, denial of service or information leak.
- CVE-2015-7513 It was discovered that a local user permitted to use the x86 KVM subsystem could configure the PIT emulation to cause a denial of service (crash).
- CVE-2015-7550 Dmitry Vyukov discovered a race condition in the keyring subsystem that allows a local user to cause a denial of service (crash).
- CVE-2015-8543 It was discovered that a local user permitted to create raw sockets could cause a denial-of-service by specifying an invalid protocol number for the socket.
The attacker must have the CAP_NET_RAW capability.
- CVE-2015-8550 Felix Wilhelm of ERNW discovered that the Xen PV backend drivers may read critical data from shared memory multiple times. This flaw can be used by a guest kernel to cause a denial of service (crash) on the host, or possibly for privilege escalation.
- CVE-2015-8551 / CVE-2015-8552 Konrad Rzeszutek Wilk of Oracle discovered that the Xen PCI backend driver does not adequately validate the device state when a guest configures MSIs. This flaw can be used by a guest kernel to cause a denial of service (crash or disk space exhaustion) on the host.
- CVE-2015-8569 Dmitry Vyukov discovered a flaw in the PPTP sockets implementation that leads to an information leak to local users.
- CVE-2015-8575 David Miller discovered a flaw in the Bluetooth SCO sockets implementation that leads to an information leak to local users.
- CVE-2015-8709 Jann Horn discovered a flaw in the permission checks for use of the ptrace feature. A local user who has the CAP_SYS_PTRACE capability within their own user namespace could use this flaw for privilege escalation if a more privileged process ever enters that user namespace. This affects at least the LXC system.
In addition, this update fixes some regressions in the previous update :
- #808293 A regression in the UDP implementation prevented freeradius and some other applications from receiving data.
- #808602 / #808953
A regression in the USB XHCI driver prevented use of some devices in USB 3 SuperSpeed ports.
- #808973
A fix to the radeon driver interacted with an existing bug to cause a crash at boot when using some AMD/ATI graphics cards. This issue only affects wheezy.
Solution
Upgrade the linux packages.
For the oldstable distribution (wheezy), these problems have been fixed in version 3.2.73-2+deb7u2. The oldstable distribution (wheezy) is not affected by CVE-2015-8709.
For the stable distribution (jessie), these problems have been fixed in version 3.16.7-ckt20-1+deb8u2. CVE-2015-8543 was already fixed in version 3.16.7-ckt20-1+deb8u1.