Advisory Published

USN-1211-1: Linux kernel vulnerabilities

First published: Wed Sep 21 2011(Updated: )

It was discovered that the /proc filesystem did not correctly handle permission changes when programs executed. A local attacker could hold open files to examine details about programs running with higher privileges, potentially increasing the chances of exploiting additional vulnerabilities. (CVE-2011-1020) Dan Rosenberg discovered that the X.25 Rose network stack did not correctly handle certain fields. If a system was running with Rose enabled, a remote attacker could send specially crafted traffic to gain root privileges. (CVE-2011-1493) Vasiliy Kulikov and Dan Rosenberg discovered that ecryptfs did not correctly check the origin of mount points. A local attacker could exploit this to trick the system into unmounting arbitrary mount points, leading to a denial of service. (CVE-2011-1833) It was discovered that Bluetooth l2cap and rfcomm did not correctly initialize structures. A local attacker could exploit this to read portions of the kernel stack, leading to a loss of privacy. (CVE-2011-2492) It was discovered that GFS2 did not correctly check block sizes. A local attacker could exploit this to crash the system, leading to a denial of service. (CVE-2011-2689) Fernando Gont discovered that the IPv6 stack used predictable fragment identification numbers. A remote attacker could exploit this to exhaust network resources, leading to a denial of service. (CVE-2011-2699) The performance counter subsystem did not correctly handle certain counters. A local attacker could exploit this to crash the system, leading to a denial of service. (CVE-2011-2918) A flaw was found in the Linux kernel's /proc//map* interface. A local, unprivileged user could exploit this flaw to cause a denial of service. (CVE-2011-3637) Ben Hutchings discovered several flaws in the Linux Rose (X.25 PLP) layer. A local user or a remote user on an X.25 network could exploit these flaws to execute arbitrary code as root. (CVE-2011-4914)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/linux-image-2.6.38-11-generic<2.6.38-11.50
2.6.38-11.50
=11.04
All of
ubuntu/linux-image-2.6.38-11-omap<2.6.38-11.50
2.6.38-11.50
=11.04
All of
ubuntu/linux-image-2.6.38-11-powerpc-smp<2.6.38-11.50
2.6.38-11.50
=11.04
All of
ubuntu/linux-image-2.6.38-11-versatile<2.6.38-11.50
2.6.38-11.50
=11.04
All of
ubuntu/linux-image-2.6.38-11-powerpc64-smp<2.6.38-11.50
2.6.38-11.50
=11.04
All of
ubuntu/linux-image-2.6.38-11-virtual<2.6.38-11.50
2.6.38-11.50
=11.04
All of
ubuntu/linux-image-2.6.38-11-generic-pae<2.6.38-11.50
2.6.38-11.50
=11.04
All of
ubuntu/linux-image-2.6.38-11-powerpc<2.6.38-11.50
2.6.38-11.50
=11.04
All of
ubuntu/linux-image-2.6.38-11-server<2.6.38-11.50
2.6.38-11.50
=11.04

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