USN-1211-1: Linux kernel vulnerabilities

Releases

• Ubuntu 11.04

Packages

• linux - Linux kernel

Details

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)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 11.04

• linux-image-2.6.38-11-generic - 2.6.38-11.50
• linux-image-2.6.38-11-omap - 2.6.38-11.50
• linux-image-2.6.38-11-powerpc-smp - 2.6.38-11.50
• linux-image-2.6.38-11-versatile - 2.6.38-11.50
• linux-image-2.6.38-11-powerpc64-smp - 2.6.38-11.50
• linux-image-2.6.38-11-virtual - 2.6.38-11.50
• linux-image-2.6.38-11-generic-pae - 2.6.38-11.50
• linux-image-2.6.38-11-powerpc - 2.6.38-11.50
• linux-image-2.6.38-11-server - 2.6.38-11.50

After a standard system update you need to reboot your computer to make
all the necessary changes.

References

• CVE-2011-1020
• CVE-2011-1493
• CVE-2011-1833
• CVE-2011-2492
• CVE-2011-2689
• CVE-2011-2699
• CVE-2011-2918
• CVE-2011-3637
• CVE-2011-4914

Related notices

• USN-1205-1: linux-image-2.6.35-30-server, linux-image-2.6.35-30-generic, linux-image-2.6.35-30-generic-pae, linux-lts-backport-maverick, linux-image-2.6.35-30-virtual
• USN-1189-1: linux-image-2.6.24-29-powerpc-smp, linux-image-2.6.24-29-lpiacompat, linux-image-2.6.24-29-rt, linux-image-2.6.24-29-mckinley, linux-image-2.6.24-29-386, linux-image-2.6.24-29-itanium, linux, linux-image-2.6.24-29-virtual, linux-image-2.6.24-29-sparc64, linux-image-2.6.24-29-lpia, linux-image-2.6.24-29-hppa64, linux-image-2.6.24-29-hppa32, linux-image-2.6.24-29-powerpc, linux-image-2.6.24-29-xen, linux-image-2.6.24-29-openvz, linux-image-2.6.24-29-server, linux-image-2.6.24-29-generic, linux-image-2.6.24-29-powerpc64-smp, linux-image-2.6.24-29-sparc64-smp
• USN-1202-1: linux-ti-omap4, linux-image-2.6.35-903-omap4
• USN-1203-1: linux-mvl-dove, linux-image-2.6.32-218-dove
• USN-1218-1: linux, linux-image-2.6.32-34-386, linux-image-2.6.32-34-powerpc64-smp, linux-image-2.6.32-34-server, linux-image-2.6.32-34-lpia, linux-image-2.6.32-34-sparc64-smp, linux-image-2.6.32-34-powerpc, linux-image-2.6.32-34-sparc64, linux-image-2.6.32-34-powerpc-smp, linux-image-2.6.32-34-virtual, linux-image-2.6.32-34-generic-pae, linux-image-2.6.32-34-generic, linux-image-2.6.32-34-ia64, linux-image-2.6.32-34-versatile, linux-image-2.6.32-34-preempt
• USN-1204-1: linux-fsl-imx51, linux-image-2.6.31-610-imx51
• USN-1208-1: linux-image-2.6.32-418-dove, linux-mvl-dove
• USN-1256-1: linux-image-2.6.38-12-virtual, linux-image-2.6.38-12-generic, linux-image-2.6.38-12-generic-pae, linux-lts-backport-natty, linux-image-2.6.38-12-server
• USN-1201-1: linux, linux-image-2.6.35-30-server, linux-image-2.6.35-30-powerpc64-smp, linux-image-2.6.35-30-powerpc, linux-image-2.6.35-30-generic, linux-image-2.6.35-30-generic-pae, linux-image-2.6.35-30-versatile, linux-image-2.6.35-30-omap, linux-image-2.6.35-30-powerpc-smp, linux-image-2.6.35-30-virtual
• USN-1212-1: linux-image-2.6.38-1209-omap4, linux-ti-omap4
• USN-1216-1: linux-ec2, linux-image-2.6.32-318-ec2
• USN-1219-1: linux-image-2.6.35-30-server, linux-image-2.6.35-30-generic, linux-image-2.6.35-30-generic-pae, linux-lts-backport-maverick, linux-image-2.6.35-30-virtual
• USN-1253-1: linux, linux-image-2.6.32-35-generic, linux-image-2.6.32-35-ia64, linux-image-2.6.32-35-powerpc64-smp, linux-image-2.6.32-35-sparc64-smp, linux-image-2.6.32-35-virtual, linux-image-2.6.32-35-powerpc-smp, linux-image-2.6.32-35-powerpc, linux-image-2.6.32-35-sparc64, linux-image-2.6.32-35-generic-pae, linux-image-2.6.32-35-386, linux-image-2.6.32-35-lpia, linux-image-2.6.32-35-preempt, linux-image-2.6.32-35-server, linux-image-2.6.32-35-versatile
• USN-1239-1: linux-ec2, linux-image-2.6.32-319-ec2
• USN-1188-1: ecryptfs-utils
• USN-1227-1: linux, linux-image-2.6.35-30-server, linux-image-2.6.35-30-powerpc64-smp, linux-image-2.6.35-30-powerpc, linux-image-2.6.35-30-generic, linux-image-2.6.35-30-generic-pae, linux-image-2.6.35-30-versatile, linux-image-2.6.35-30-omap, linux-image-2.6.35-30-powerpc-smp, linux-image-2.6.35-30-virtual
• USN-1240-1: linux-image-2.6.32-219-dove, linux-mvl-dove
• USN-1245-1: linux-image-2.6.32-419-dove, linux-mvl-dove
• USN-1225-1: linux-image-2.6.24-29-powerpc-smp, linux-image-2.6.24-29-lpiacompat, linux-image-2.6.24-29-rt, linux-image-2.6.24-29-mckinley, linux-image-2.6.24-29-386, linux-image-2.6.24-29-itanium, linux, linux-image-2.6.24-29-virtual, linux-image-2.6.24-29-sparc64, linux-image-2.6.24-29-lpia, linux-image-2.6.24-29-hppa64, linux-image-2.6.24-29-hppa32, linux-image-2.6.24-29-powerpc, linux-image-2.6.24-29-xen, linux-image-2.6.24-29-openvz, linux-image-2.6.24-29-server, linux-image-2.6.24-29-generic, linux-image-2.6.24-29-powerpc64-smp, linux-image-2.6.24-29-sparc64-smp