(RHSA-2006:0493) kernel security update

The Linux kernel handles the basic functions of the operating system.

These new kernel packages contain fixes for the security issues
described below:

• a flaw in the IPv6 implementation that allowed a local user to cause a
  denial of service (infinite loop and crash) (CVE-2005-2973, important)

• a flaw in the bridge implementation that allowed a remote user to
  cause forwarding of spoofed packets via poisoning of the forwarding
  table with already dropped frames (CVE-2005-3272, moderate)

• a flaw in the atm module that allowed a local user to cause a denial
  of service (panic) via certain socket calls (CVE-2005-3359, important)

• a flaw in the NFS client implementation that allowed a local user to
  cause a denial of service (panic) via O_DIRECT writes (CVE-2006-0555,
  important)

• a difference in “sysretq” operation of EM64T (as opposed to Opteron)
  processors that allowed a local user to cause a denial of service
  (crash) upon return from certain system calls (CVE-2006-0741 and
  CVE-2006-0744, important)

• a flaw in the keyring implementation that allowed a local user to
  cause a denial of service (OOPS) (CVE-2006-1522, important)

• a flaw in IP routing implementation that allowed a local user to cause
  a denial of service (panic) via a request for a route for a multicast IP
  (CVE-2006-1525, important)

• a flaw in the SCTP-netfilter implementation that allowed a remote user
  to cause a denial of service (infinite loop) (CVE-2006-1527, important)

• a flaw in the sg driver that allowed a local user to cause a denial of
  service (crash) via a dio transfer to memory mapped (mmap) IO space
  (CVE-2006-1528, important)

• a flaw in the threading implementation that allowed a local user to
  cause a denial of service (panic) (CVE-2006-1855, important)

• two missing LSM hooks that allowed a local user to bypass the LSM by
  using readv() or writev() (CVE-2006-1856, moderate)

• a flaw in the virtual memory implementation that allowed local user to
  cause a denial of service (panic) by using the lsof command
  (CVE-2006-1862, important)

• a directory traversal vulnerability in smbfs that allowed a local user
  to escape chroot restrictions for an SMB-mounted filesystem via “…\”
  sequences (CVE-2006-1864, moderate)

• a flaw in the ECNE chunk handling of SCTP that allowed a remote user
  to cause a denial of service (panic) (CVE-2006-2271, moderate)

• a flaw in the handling of COOKIE_ECHO and HEARTBEAT control chunks of
  SCTP that allowed a remote user to cause a denial of service (panic)
  (CVE-2006-2272, moderate)

• a flaw in the handling of DATA fragments of SCTP that allowed a remote
  user to cause a denial of service (infinite recursion and crash)
  (CVE-2006-2274, moderate)

All Red Hat Enterprise Linux 4 users are advised to upgrade their kernels
to the packages associated with their machine architectures and
configurations as listed in this erratum.