The remote Red Hat host is missing one or more security updates.
Updated kernel packages that fix security issues, address several
hundred bugs and add numerous enhancements are now available as part
of the ongoing support and maintenance of Red Hat Enterprise Linux
version 5. This is the fourth regular update.
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
These updated packages fix the following security issues :
* it was discovered that, when executing a new process, the
clear_child_tid pointer in the Linux kernel is not cleared. If this
pointer points to a writable portion of the memory of the new program,
the kernel could corrupt four bytes of memory, possibly leading to a
local denial of service or privilege escalation. (CVE-2009-2848,
* a flaw was found in the way the do_sigaltstack() function in the
Linux kernel copies the stack_t structure to user-space. On 64-bit
machines, this flaw could lead to a four-byte information leak.
* a flaw was found in the ext4 file system code. A local attacker
could use this flaw to cause a denial of service by performing a
resize operation on a specially crafted ext4 file system.
* multiple flaws were found in the ext4 file system code. A local
attacker could use these flaws to cause a denial of service by
mounting a specially crafted ext4 file system. (CVE-2009-0746,
CVE-2009-0747, CVE-2009-0748, Low)
These updated packages also include several hundred bug fixes for and
enhancements to the Linux kernel. Space precludes documenting each of
these changes in this advisory and users are directed to the Red Hat
Enterprise Linux 5.4 Release Notes for information on the most
significant of these changes :
Also, for details concerning every bug fixed in and every enhancement
added to the kernel for this release, see the kernel chapter in the
Red Hat Enterprise Linux 5.4 Technical Notes :
All Red Hat Enterprise Linux 5 users are advised to install these
updated packages, which address these vulnerabilities as well as
fixing the bugs and adding the enhancements noted in the Red Hat
Enterprise Linux 5.4 Release Notes and Technical Notes. The system
must be rebooted for this update to take effect.
See also :
Update the affected packages.
Risk factor :
Medium / CVSS Base Score : 4.9
CVSS Temporal Score : 4.3
Public Exploit Available : true