The remote Red Hat host is missing one or more security updates.
Updated kernel packages that fix several security issues and several
bugs are now available for Red Hat Enterprise Linux 5.
This update has been rated as having important security impact by the
Red Hat Security Response Team.
The kernel packages contain the Linux kernel, the core of any Linux
Security fixes :
* several flaws were found in the way the Linux kernel CIFS
implementation handles Unicode strings. CIFS clients convert Unicode
strings sent by a server to their local character sets, and then write
those strings into memory. If a malicious server sent a long enough
string, it could write past the end of the target memory region and
corrupt other memory areas, possibly leading to a denial of service or
privilege escalation on the client mounting the CIFS share.
(CVE-2009-1439, CVE-2009-1633, Important)
* the Linux kernel Network File System daemon (nfsd) implementation
did not drop the CAP_MKNOD capability when handling requests from
local, unprivileged users. This flaw could possibly lead to an
information leak or privilege escalation. (CVE-2009-1072, Moderate)
* Frank Filz reported the NFSv4 client was missing a file permission
check for the execute bit in some situations. This could allow local,
unprivileged users to run non-executable files on NFSv4 mounted file
systems. (CVE-2009-1630, Moderate)
* a missing check was found in the hypervisor_callback() function in
the Linux kernel provided by the kernel-xen package. This could cause
a denial of service of a 32-bit guest if an application running in
that guest accesses a certain memory location in the kernel.
* a flaw was found in the AGPGART driver. The agp_generic_alloc_page()
and agp_generic_alloc_pages() functions did not zero out the memory
pages they allocate, which may later be available to user-space
processes. This flaw could possibly lead to an information leak.
Bug fixes :
* a race in the NFS client between destroying cached access rights and
unmounting an NFS file system could have caused a system crash. 'Busy
inodes' messages may have been logged. (BZ#498653)
* nanosleep() could sleep several milliseconds less than the specified
time on Intel ItaniumÂ®-based systems. (BZ#500349)
* LEDs for disk drives in AHCI mode may have displayed a fault state
when there were no faults. (BZ#500120)
* ptrace_do_wait() reported tasks were stopped each time the process
doing the trace called wait(), instead of reporting it once.
* epoll_wait() may have caused a system lockup and problems for
* missing capabilities could possibly allow users with an fsuid other
than 0 to perform actions on some file system types that would
otherwise be prevented. (BZ#497271)
* on NFS mounted file systems, heavy write loads may have blocked
nfs_getattr() for long periods, causing commands that use stat(2),
such as ls, to hang. (BZ#486926)
* in rare circumstances, if an application performed multiple O_DIRECT
reads per virtual memory page and also performed fork(2), the buffer
storing the result of the I/O may have ended up with invalid data.
* when using GFS2, gfs2_quotad may have entered an uninterpretable
sleep state. (BZ#501742)
* with this update, get_random_int() is more random and no longer uses
a common seed value, reducing the possibility of predicting the values
* the '-fwrapv' flag was added to the gcc build options to prevent gcc
from optimizing away wrapping. (BZ#501751)
* a kernel panic when enabling and disabling iSCSI paths. (BZ#502916)
* using the Broadcom NetXtreme BCM5704 network device with the tg3
driver caused high system load and very bad performance. (BZ#502837)
* '/proc/[pid]/maps' and '/proc/[pid]/smaps' can only be read by
processes able to use the ptrace() call on a given process
certain information from '/proc/[pid]/stat' and '/proc/[pid]/wchan'
could be used to reconstruct memory maps. (BZ#499546)
Users should upgrade to these updated packages, which contain
backported patches to correct these issues. The system must be
rebooted for this update to take effect.
See also :
Update the affected packages.
Risk factor :
High / CVSS Base Score : 7.8
CVSS Temporal Score : 6.8
Public Exploit Available : false