The remote Red Hat host is missing one or more security updates.
Updated kernel packages that fix multiple security issues and one bug
are now available for Red Hat Enterprise Linux 4.
The Red Hat Security Response Team has rated this update as having
important security impact. Common Vulnerability Scoring System (CVSS)
base scores, which give detailed severity ratings, are available for
each vulnerability from the CVE links in the References section.
The kernel packages contain the Linux kernel, the core of any Linux
This update fixes the following security issues :
* a flaw was found in the CIFSSMBWrite() function in the Linux kernel
Common Internet File System (CIFS) implementation. A remote attacker
could send a specially crafted SMB response packet to a target CIFS
client, resulting in a kernel panic (denial of service).
* buffer overflow flaws were found in the Linux kernel's
implementation of the server-side External Data Representation (XDR)
for the Network File System (NFS) version 4. An attacker on the local
network could send a specially crafted large compound request to the
NFSv4 server, which could possibly result in a kernel panic (denial of
service) or, potentially, code execution. (CVE-2010-2521, Important)
This update also fixes the following bug :
* the rpc_call_async() function in the SUN Remote Procedure Call (RPC)
subsystem in the Linux kernel had a reference counting bug. In certain
situations, some Network Lock Manager (NLM) messages may have
triggered this bug on NFSv2 and NFSv3 servers, leading to a kernel
panic (with 'kernel BUG at fs/lockd/host.c:[xxx]!' logged to
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 :
Critical / CVSS Base Score : 10.0
CVSS Temporal Score : 7.4
Public Exploit Available : false