Scientific Linux Security Update : kernel on SL5.x i386/x86_64

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Synopsis :

The remote Scientific Linux host is missing one or more security

Description :

These updated packages fix the following security issues :

- a possible kernel memory leak was found in the Linux
kernel Simple Internet Transition (SIT) INET6
implementation. This could allow a local unprivileged
user to cause a denial of service. (CVE-2008-2136,

- a flaw was found in the Linux kernel setrlimit system
call, when setting RLIMIT_CPU to a certain value. This
could allow a local unprivileged user to bypass the CPU
time limit. (CVE-2008-1294, Moderate)

- multiple NULL pointer dereferences were found in various
Linux kernel network drivers. These drivers were missing
checks for terminal validity, which could allow
privilege escalation. (CVE-2008-2812, Moderate)

These updated packages fix the following bugs :

- the GNU libc stub resolver is a minimal resolver that
works with Domain Name System (DNS) servers to satisfy
requests from applications for names. The GNU libc stub
resolver did not specify a source UDP port, and
therefore used predictable port numbers. This could have
made DNS spoofing attacks easier.

The Linux kernel has been updated to implement random UDP source ports
where none are specified by an application. This allows applications,
such as those using the GNU libc stub resolver, to use random UDP
source ports, helping to make DNS spoofing attacks harder.

- when using certain hardware, a bug in UART_BUG_TXEN may
have caused incorrect hardware detection, causing data
flow to '/dev/ttyS1' to hang.

- a 50-75% drop in NFS server rewrite performance,
compared to Red Hat Enterprise Linux 4.6, has been

- due a bug in the fast userspace mutex code, while one
thread fetched a pointer, another thread may have
removed it, causing the first thread to fetch the wrong
pointer, possibly causing a system crash.

- on certain Hitachi hardware, removing the 'uhci_hcd'
module caused a kernel oops, and the following error :

BUG: warning at

Even after the 'uhci_hcd' module was reloaded, there was no access to
USB devices. As well, on systems that have legacy interrupts,
'acpi_unregister_gsi' incorrectly called 'iosapci_unregister_intr()',
causing warning messages to be logged.

- when a page was mapped with mmap(), and 'PROT_WRITE' was
the only 'prot' argument, the first read of that page
caused a segmentation fault. If the page was read after
it was written to, no fault occurred. This was
incompatible with the Red Hat Enterprise Linux 4

- due to a NULL pointer dereference in powernowk8_init(),
a panic may have occurred.

- certain error conditions handled by the bonding sysfs
interface could have left rtnl_lock() unbalanced, either
by locking and returning without unlocking, or by
unlocking when it did not lock, possibly causing a
'kernel: RTNL: assertion failed at net/core/fib_rules.c'

- the kernel currently expects a maximum of six Machine
Check Exception (MCE) banks to be exposed by a CPU.
Certain CPUs have 7 or more, which may have caused the
MCE to be incorrectly reported.

- a race condition in UNIX domain sockets may have caused
recv() to return zero. For clusters, this may have
caused unexpected failovers.

- msgrcv() frequently returned an incorrect
'ERESTARTNOHAND (514)' error number.

- on certain Intel Itanium-based systems, when kdump was
configured to halt the system after a dump operation,
after the 'System halted.' output, the kernel continued
to output endless 'soft lockup' messages.

See also :

Solution :

Update the affected packages.

Risk factor :

High / CVSS Base Score : 7.8

Family: Scientific Linux Local Security Checks

Nessus Plugin ID: 60459 ()

Bugtraq ID:

CVE ID: CVE-2008-1294

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