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HistoryDec 20, 2007 - 12:00 a.m.

linux-2.6 fai-kernels user-mode-linux - several vulnerabilities

2007-12-2000:00:00
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Several local vulnerabilities have been discovered in the Linux kernel
that may lead to a denial of service or the execution of arbitrary
code. The Common Vulnerabilities and Exposures project identifies the
following problems:

  • CVE-2006-6058
    LMH reported an issue in the minix filesystem that allows local users
    with mount privileges to create a DoS (printk flood) by mounting a
    specially crafted corrupt filesystem.
  • CVE-2007-5966
    Warren Togami discovered an issue in the hrtimer subsystem that allows
    a local user to cause a DoS (soft lockup) by requesting a timer sleep
    for a long period of time leading to an integer overflow.
  • CVE-2007-6063
    Venustech AD-LAB discovered a buffer overflow in the isdn ioctl
    handling, exploitable by a local user.
  • CVE-2007-6206
    Blake Frantz discovered that when a core file owned by a non-root user
    exists, and a root-owned process dumps core over it, the core file
    retains its original ownership. This could be used by a local user to
    gain access to sensitive information.
  • CVE-2007-6417
    Hugh Dickins discovered an issue in the tmpfs filesystem where, under
    a rare circumstance, a kernel page may be improperly cleared, leaking
    sensitive kernel memory to userspace or resulting in a DoS (crash).

These problems have been fixed in the stable distribution in version
2.6.18.dfsg.1-13etch6.

The following matrix lists additional packages that were rebuilt for
compatibility with or to take advantage of this update:

Debian 4.0 (etch)
fai-kernels 1.17+etch.13etch6
user-mode-linux 2.6.18-1um-2etch.13etch6

We recommend that you upgrade your kernel package immediately and reboot
the machine. If you have built a custom kernel from the kernel source
package, you will need to rebuild to take advantage of these fixes.