From the Red Hat advisory:
the RHSA-2009:0225 update introduced a rewrite attack flaw in the
do_coredump() function. A local attacker able to guess the file name a
process is going to dump its core to, prior to the process crashing, could
use this flaw to append data to the dumped core file. This issue only
affects systems that have "/proc/sys/fs/suid_dumpable" set to 2 (the
default value is 0). (CVE-2006-6304, Moderate)
The fix for CVE-2006-6304 changes the expected behavior: With suid_dumpable
set to 2, the core file will not be recorded if the file already exists.
For example, core files will not be overwritten on subsequent crashes of
processes whose core files map to the same name.
the RHBA-2008:0314 update introduced N_Port ID Virtualization (NPIV)
support in the qla2xxx driver, resulting in two new sysfs pseudo files,
"/sys/class/scsi_host/[a qla2xxx host]/vport_create" and "vport_delete".
These two files were world-writable by default, allowing a local user to
change SCSI host attributes. This flaw only affects systems using the
qla2xxx driver and NPIV capable hardware. (CVE-2009-3556, Moderate)
a buffer overflow flaw was found in the hfs_bnode_read() function in the
HFS file system implementation. This could lead to a denial of service if a
user browsed a specially-crafted HFS file system, for example, by running
"ls". (CVE-2009-4020, Low)
Tavis Ormandy discovered a deficiency in the fasync_helper()
implementation. This could allow a local, unprivileged user to leverage a
use-after-free of locked, asynchronous file descriptors to cause a denial
of service or privilege escalation. (CVE-2009-4141, Important)
the Parallels Virtuozzo Containers team reported the RHSA-2009:1243
update introduced two flaws in the routing implementation. If an attacker
was able to cause a large enough number of collisions in the routing hash
table (via specially-crafted packets) for the emergency route flush to
trigger, a deadlock could occur. Secondly, if the kernel routing cache was
disabled, an uninitialized pointer would be left behind after a route
lookup, leading to a kernel panic. (CVE-2009-4272, Important)
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