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From Red Hat Security Advisory 2010:0076 :
Updated kernel packages that fix multiple security issues and three
bugs are now available for Red Hat Enterprise Linux 4.
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
This update fixes the following security issues :
* an array index error was found in the gdth driver in the Linux
kernel. A local user could send a specially crafted IOCTL request that
would cause a denial of service or, possibly, privilege escalation.
* a flaw was found in the collect_rx_frame() function in the HiSax
ISDN driver (hfc_usb) in the Linux kernel. An attacker could use this
flaw to send a specially crafted HDLC packet that could trigger a
buffer out of bounds, possibly resulting in a denial of service.
* permission issues were found in the megaraid_sas driver (for SAS
based RAID controllers) in the Linux kernel. The 'dbg_lvl' and
'poll_mode_io' files on the sysfs file system ('/sys/') had
world-writable permissions. This could allow local, unprivileged users
to change the behavior of the driver. (CVE-2009-3889, CVE-2009-3939,
* a buffer overflow flaw was found in the hfs_bnode_read() function in
the HFS file system implementation in the Linux kernel. 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)
This update also fixes the following bugs :
* if a process was using ptrace() to trace a multi-threaded process,
and that multi-threaded process dumped its core, the process
performing the trace could hang in wait4(). This issue could be
triggered by running 'strace -f' on a multi-threaded process that was
dumping its core, resulting in the strace command hanging. (BZ#555869)
* a bug in the ptrace() implementation could have, in some cases,
caused ptrace_detach() to create a zombie process if the process being
traced was terminated with a SIGKILL signal. (BZ#555869)
* the RHSA-2010:0020 update resolved an issue (CVE-2009-4537) in the
Realtek r8169 Ethernet driver. This update implements a better
solution for that issue. Note: This is not a security regression. The
original fix was complete. This update is adding the official upstream
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 kernel packages.
Risk factor :
High / CVSS Base Score : 7.8
CVSS Temporal Score : 5.8
Public Exploit Available : false