USN-752-1: Linux kernel vulnerabilities

7 April 2009

linux-source-2.6.15 vulnerabilities

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

  • Ubuntu 6.06 LTS

Software Description

  • linux-source-2.6.15


NFS did not correctly handle races between fcntl and interrupts. A local attacker on an NFS mount could consume unlimited kernel memory, leading to a denial of service. (CVE-2008-4307)

Sparc syscalls did not correctly check mmap regions. A local attacker could cause a system panic, leading to a denial of service. (CVE-2008-6107)

In certain situations, cloned processes were able to send signals to parent processes, crossing privilege boundaries. A local attacker could send arbitrary signals to parent processes, leading to a denial of service. (CVE-2009-0028)

The 64-bit syscall interfaces did not correctly handle sign extension. A local attacker could make malicious syscalls, possibly gaining root privileges. The x86_64 architecture was not affected. (CVE-2009-0029)

The SCTP stack did not correctly validate FORWARD-TSN packets. A remote attacker could send specially crafted SCTP traffic causing a system crash, leading to a denial of service. (CVE-2009-0065)

The Dell platform device did not correctly validate user parameters. A local attacker could perform specially crafted reads to crash the system, leading to a denial of service. (CVE-2009-0322)

Network interfaces statistics for the SysKonnect FDDI driver did not check capabilities. A local user could reset statistics, potentially interfering with packet accounting systems. (CVE-2009-0675)

The getsockopt function did not correctly clear certain parameters. A local attacker could read leaked kernel memory, leading to a loss of privacy. (CVE-2009-0676)

The syscall interface did not correctly validate parameters when crossing the 64-bit/32-bit boundary. A local attacker could bypass certain syscall restricts via crafted syscalls. (CVE-2009-0834, CVE-2009-0835)

The shared memory subsystem did not correctly handle certain shmctl calls when CONFIG_SHMEM was disabled. Ubuntu kernels were not vulnerable, since CONFIG_SHMEM is enabled by default. (CVE-2009-0859)

Update instructions

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

Ubuntu 6.06 LTS
linux-image-2.6.15-54-386 - 2.6.15-54.76
linux-image-2.6.15-54-686 - 2.6.15-54.76
linux-image-2.6.15-54-amd64-generic - 2.6.15-54.76
linux-image-2.6.15-54-amd64-k8 - 2.6.15-54.76
linux-image-2.6.15-54-amd64-server - 2.6.15-54.76
linux-image-2.6.15-54-amd64-xeon - 2.6.15-54.76
linux-image-2.6.15-54-hppa32 - 2.6.15-54.76
linux-image-2.6.15-54-hppa32-smp - 2.6.15-54.76
linux-image-2.6.15-54-hppa64 - 2.6.15-54.76
linux-image-2.6.15-54-hppa64-smp - 2.6.15-54.76
linux-image-2.6.15-54-itanium - 2.6.15-54.76
linux-image-2.6.15-54-itanium-smp - 2.6.15-54.76
linux-image-2.6.15-54-k7 - 2.6.15-54.76
linux-image-2.6.15-54-mckinley - 2.6.15-54.76
linux-image-2.6.15-54-mckinley-smp - 2.6.15-54.76
linux-image-2.6.15-54-powerpc - 2.6.15-54.76
linux-image-2.6.15-54-powerpc-smp - 2.6.15-54.76
linux-image-2.6.15-54-powerpc64-smp - 2.6.15-54.76
linux-image-2.6.15-54-server - 2.6.15-54.76
linux-image-2.6.15-54-server-bigiron - 2.6.15-54.76
linux-image-2.6.15-54-sparc64 - 2.6.15-54.76
linux-image-2.6.15-54-sparc64-smp - 2.6.15-54.76

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-generic, linux-server, linux-powerpc), a standard system upgrade will automatically perform this as well.