5 - RHSA-2005:808

Problem Description:

Updated kernel packages that fix several security issues and a page attribute mapping bug 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.

2. Relevant releases/architectures:

Red Hat Enterprise Linux AS version 4 - i386, ia64, noarch, ppc, s390, s390x, x86_64 Red Hat Enterprise Linux Desktop version 4 - i386, noarch, x86_64 Red Hat Enterprise Linux ES version 4 - i386, ia64, noarch, x86_64 Red Hat Enterprise Linux WS version 4 - i386, ia64, noarch, x86_64

3. Problem description:

The Linux kernel handles the basic functions of the operating system.

An issue was discovered that affects how page attributes are changed by the kernel. Video drivers, which sometimes map kernel pages with a different caching policy than write-back, are now expected to function correctly. This change affects the x86, AMD64, and Intel EM64T architectures.

In addition the following security bugs were fixed:

The set_mempolicy system call did not check for negative numbers in the policy field. An unprivileged local user could use this flaw to cause a denial of service (system panic). (CVE-2005-3053)

A flaw in ioremap handling on AMD 64 and Intel EM64T systems. An unprivileged local user could use this flaw to cause a denial of service or minor information leak. (CVE-2005-3108)

A race condition in the ebtables netfilter module. On a SMP system that is operating under a heavy load this flaw may allow remote attackers to cause a denial of service (crash). (CVE-2005-3110)

A memory leak was found in key handling. An unprivileged local user could use this flaw to cause a denial of service. (CVE-2005-3119)

A flaw in the Orinoco wireless driver. On systems running the vulnerable drive, a remote attacker could send carefully crafted packets which would divulge the contents of uninitialized kernel memory. (CVE-2005-3180)

A memory leak was found in the audit system. An unprivileged local user could use this flaw to cause a denial of service. (CVE-2005-3181)

All Red Hat Enterprise Linux 4 users are advised to upgrade their kernels to the packages associated with their machine architectures and configurations as listed in this erratum.

4. Solution:

Before applying this update, make sure that all previously-released errata relevant to your system have been applied. Use Red Hat Network to download and update your packages. To launch the Red Hat Update Agent, use the following command:

up2date

For information on how to install packages manually, refer to the following Web page for the System Administration or Customization guide specific to your system:

http://www.redhat.com/docs/manuals/enterprise/

5. Bug IDs fixed (http://bugzilla.redhat.com/):

160135 - kernel panic in ioremap with four 1GB DIMMs (2.6.9-11.ELsmp) 168217 - CAN-2005-3108 [RHEL 4] ioremap_nocache causes panic, only on one motherboard, not on upstream 2.6.12.5 or later at least 168936 - System instability when using the NVIDIA driver (i.e bad caching on address) 168993 - CAN-2005-3053 RHEL 4 sys_set_mempolicy allows invalid policy leading to panic 170264 - CAN-2005-3108 ioremap x86_64 DoS 170268 - CAN-2005-3110 ebtables race 170274 - CAN-2005-3119 config_keys memleak 170277 - CAN-2005-3180 orinoco driver information leakage 170283 - CAN-2005-3181 names_cache memory leak 170563 - kernel crash in HP Compaq dc7100 CMT(DX438AV) 171154 - RHEL4 [NETFILTER]: Fix deadlock in ip4_queue.