9.4 - RHSA-2007:0014

Problem Description:

Updated kernel packages that fix several security issues in the Red Hat Enterprise Linux 4 kernel are now available.

This security advisory 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.

These new kernel packages contain fixes for the security issues described below:

* a flaw in the get_fdb_entries function of the network bridging support that allowed a local user to cause a denial of service (crash) or allow a potential privilege escalation (CVE-2006-5751, Important)

* an information leak in the _block_prepare_write function that allowed a local user to read kernel memory (CVE-2006-4813, Important)

* an information leak in the copy_from_user() implementation on s390 and s390x platforms that allowed a local user to read kernel memory (CVE-2006-5174, Important)

* a flaw in the handling of /proc/net/ip6_flowlabel that allowed a local user to cause a denial of service (infinite loop) (CVE-2006-5619, Important)

* a flaw in the AIO handling that allowed a local user to cause a denial of
service (panic) (CVE-2006-5754, Important)

* a race condition in the mincore system core that allowed a local user to cause a denial of service (system hang) (CVE-2006-4814, Moderate)

* a flaw in the ELF handling on ia64 and sparc architectures which triggered a cross-region memory mapping and allowed a local user to cause a denial of service (CVE-2006-4538, Moderate)

* a flaw in the dev_queue_xmit function of the network subsystem that allowed a local user to cause a denial of service (data corruption) (CVE-2006-6535, Moderate)

* a flaw in the handling of CAPI messages over Bluetooth that allowed a remote system to cause a denial of service or potential code execution. This flaw is only exploitable if a privileged user establishes a connection to a malicious remote device (CVE-2006-6106, Moderate)

* a flaw in the listxattr system call that allowed a local user to cause a denial of service (data corruption) or potential privilege escalation. To successfully exploit this flaw the existence of a bad inode is required first (CVE-2006-5753, Moderate)

* a flaw in the __find_get_block_slow function that allowed a local privileged user to cause a denial of service (CVE-2006-5757, Low)

* various flaws in the supported filesystems that allowed a local privileged user to cause a denial of service (CVE-2006-5823, CVE-2006-6053, CVE-2006-6054, CVE-2006-6056, Low)

In addition to the security issues described above, fixes for the following bugs were included:

* initialization error of the tg3 driver with some BCM5703x network card

* a memory leak in the audit subsystem

* x86_64 nmi watchdog timeout is too short

* ext2/3 directory reads fail intermittently

Red Hat would like to thank Dmitriy Monakhov and Kostantin Khorenko for reporting issues fixed in this erratum.

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

4. Solution:

Before applying this update, make sure all previously released errata relevant to your system have been applied.

This update is available via Red Hat Network. To use Red Hat Network, launch the Red Hat Update Agent with the following command:

up2date

This will start an interactive process that will result in the appropriate RPMs being upgraded on your system.

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

180663 - CVE-2006-4814 Race condition in mincore can cause "ps -ef" to hang 205335 - CVE-2006-4538 Local DoS with corrupted ELF 206328 - CVE-2006-5757 Linux kernel Filesystem Mount Dead Loop 207463 - CVE-2006-4813 Information leak in __block_prepare_write() 209435 - CVE-2006-5174 copy_from_user information leak on s390 212144 - CVE-2006-6535 unbalanced local_bh_enable() in dev_queue_xmit() 213214 - CVE-2006-5619 Lockup via /proc/net/ip6_flowlabel 213921 - SAN file systems becoming read-only 214288 - CVE-2006-5757 ISO9660 __find_get_block_slow() denial of service 216452 - CVE-2006-5751 Linux kernel get_fdb_entries() integer overflow 216958 - CVE-2006-5823 zlib_inflate memory corruption 217011 - CVE-2006-6056 SELinux superblock_doinit denial of service 217021 - CVE-2006-6054 ext2_check_page denial of service 217030 - CVE-2006-6053 ext3fs_dirhash denial of service 218602 - CVE-2006-6106 Multiple problems in net/bluetooth/cmtp/capi.c 220677 - CVE-2006-5753 listxattr syscall can corrupt user space programs 220971 - CVE-2006-5754 kernel panic in aio_free_ring()