USN-618-1: Linux kernel vulnerabilities

Ubuntu Security Notice USN-618-1

19th June, 2008

linux-source-2.6.15/20/22 vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 7.10
  • Ubuntu 7.04
  • Ubuntu 6.06 LTS

Software description

  • linux-backports-modules-2.6.15
  • linux-backports-modules-2.6.20
  • linux-backports-modules-2.6.22
  • linux-restricted-modules-2.6.15
  • linux-restricted-modules-2.6.20
  • linux-restricted-modules-2.6.22
  • linux-source-2.6.15
  • linux-source-2.6.20
  • linux-source-2.6.22
  • linux-ubuntu-modules-2.6.22


It was discovered that the ALSA /proc interface did not write the
correct number of bytes when reporting memory allocations. A local
attacker might be able to access sensitive kernel memory, leading to
a loss of privacy. (CVE-2007-4571)

Multiple buffer overflows were discovered in the handling of CIFS
filesystems. A malicious CIFS server could cause a client system crash
or possibly execute arbitrary code with kernel privileges. (CVE-2007-5904)

It was discovered that PowerPC kernels did not correctly handle reporting
certain system details. By requesting a specific set of information,
a local attacker could cause a system crash resulting in a denial
of service. (CVE-2007-6694)

It was discovered that some device driver fault handlers did not
correctly verify memory ranges. A local attacker could exploit this
to access sensitive kernel memory, possibly leading to a loss of privacy.

It was discovered that CPU resource limits could be bypassed.
A malicious local user could exploit this to avoid administratively
imposed resource limits. (CVE-2008-1294)

A race condition was discovered between dnotify fcntl() and close() in
the kernel. If a local attacker performed malicious dnotify requests,
they could cause memory consumption leading to a denial of service,
or possibly send arbitrary signals to any process. (CVE-2008-1375)

On SMP systems, a race condition existed in fcntl(). Local attackers
could perform malicious locks, causing system crashes and leading to
a denial of service. (CVE-2008-1669)

Update instructions

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

Ubuntu 7.10:
linux-image-2.6.22-15-mckinley 2.6.22-15.54
linux-image-2.6.22-15-generic 2.6.22-15.54
linux-image-2.6.22-15-hppa32 2.6.22-15.54
linux-image-2.6.22-15-xen 2.6.22-15.54
linux-image-2.6.22-15-sparc64-smp 2.6.22-15.54
linux-image-2.6.22-15-powerpc 2.6.22-15.54
linux-image-2.6.22-15-itanium 2.6.22-15.54
linux-image-2.6.22-15-lpiacompat 2.6.22-15.54
linux-image-2.6.22-15-386 2.6.22-15.54
linux-image-2.6.22-15-powerpc-smp 2.6.22-15.54
linux-image-2.6.22-15-lpia 2.6.22-15.54
linux-image-2.6.22-15-sparc64 2.6.22-15.54
linux-image-2.6.22-15-rt 2.6.22-15.54
linux-image-2.6.22-15-virtual 2.6.22-15.54
linux-image-2.6.22-15-server 2.6.22-15.54
linux-image-2.6.22-15-powerpc64-smp 2.6.22-15.54
linux-image-2.6.22-15-hppa64 2.6.22-15.54
linux-image-2.6.22-15-cell 2.6.22-15.54
linux-image-2.6.22-15-ume 2.6.22-15.54
Ubuntu 7.04:
linux-image-2.6.20-17-hppa32 2.6.20-17.36
linux-image-2.6.20-17-386 2.6.20-17.36
linux-image-2.6.20-17-sparc64-smp 2.6.20-17.36
linux-image-2.6.20-17-generic 2.6.20-17.36
linux-image-2.6.20-17-hppa64 2.6.20-17.36
linux-image-2.6.20-17-lowlatency 2.6.20-17.36
linux-image-2.6.20-17-mckinley 2.6.20-17.36
linux-image-2.6.20-17-server-bigiron 2.6.20-17.36
linux-image-2.6.20-17-server 2.6.20-17.36
linux-image-2.6.20-17-powerpc64-smp 2.6.20-17.36
linux-image-2.6.20-17-powerpc 2.6.20-17.36
linux-image-2.6.20-17-powerpc-smp 2.6.20-17.36
linux-image-2.6.20-17-sparc64 2.6.20-17.36
linux-image-2.6.20-17-itanium 2.6.20-17.36
Ubuntu 6.06 LTS:
linux-image-2.6.15-52-386 2.6.15-52.67
linux-image-2.6.15-52-mckinley 2.6.15-52.67
linux-image-2.6.15-52-amd64-server 2.6.15-52.67
linux-image-2.6.15-52-hppa32 2.6.15-52.67
linux-image-2.6.15-52-k7 2.6.15-52.67
linux-image-2.6.15-52-686 2.6.15-52.67
linux-image-2.6.15-52-amd64-k8 2.6.15-52.67
linux-image-2.6.15-52-server-bigiron 2.6.15-52.67
linux-image-2.6.15-52-powerpc64-smp 2.6.15-52.67
linux-image-2.6.15-52-sparc64-smp 2.6.15-52.67
linux-image-2.6.15-52-itanium 2.6.15-52.67
linux-image-2.6.15-52-server 2.6.15-52.67
linux-image-2.6.15-52-hppa32-smp 2.6.15-52.67
linux-image-2.6.15-52-amd64-xeon 2.6.15-52.67
linux-image-2.6.15-52-mckinley-smp 2.6.15-52.67
linux-image-2.6.15-52-hppa64-smp 2.6.15-52.67
linux-image-2.6.15-52-hppa64 2.6.15-52.67
linux-image-2.6.15-52-powerpc 2.6.15-52.67
linux-image-2.6.15-52-powerpc-smp 2.6.15-52.67
linux-image-2.6.15-52-amd64-generic 2.6.15-52.67
linux-image-2.6.15-52-itanium-smp 2.6.15-52.67
linux-image-2.6.15-52-sparc64 2.6.15-52.67

To update your system, please follow these instructions:

After a standard system upgrade you need to reboot your computer to
effect the necessary changes.

ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed. If
you use linux-restricted-modules, you have to update that package as
well to get modules which work with the new kernel version. Unless you
manually uninstalled the standard kernel metapackages (e.g. linux-386,
linux-powerpc, linux-amd64-generic), a standard system upgrade will
automatically perform this as well.


CVE-2007-4571, CVE-2007-5904, CVE-2007-6694, CVE-2008-0007, CVE-2008-1294, CVE-2008-1375, CVE-2008-1669