Linux Kernel 'drivers/char/n_tty.c' NULL Pointer Dereference Denial of Service Vulnerability

Bugtraq ID:	37147
Class:	Race Condition Error
CVE:
Remote:	No
Local:	Yes
Published:	Nov 30 2009 12:00AM
Updated:	Nov 30 2009 08:55PM
Credit:	Kyle Bader
Vulnerable:	Linux kernel 2.6.31 5 + Trustix Secure Enterprise Linux 2.0 + Trustix Secure Linux 2.2 + Trustix Secure Linux 2.1 + Trustix Secure Linux 2.0 Linux kernel 2.6.32-rc7 Linux kernel 2.6.32-rc5 + Trustix Secure Enterprise Linux 2.0 + Trustix Secure Linux 2.2 + Trustix Secure Linux 2.1 + Trustix Secure Linux 2.0 Linux kernel 2.6.32-rc4 Linux kernel 2.6.32-rc3 + Trustix Secure Enterprise Linux 2.0 + Trustix Secure Linux 2.2 + Trustix Secure Linux 2.1 + Trustix Secure Linux 2.0 Linux kernel 2.6.32-rc2 Linux kernel 2.6.32-rc1
Not Vulnerable:

Linux Kernel 'drivers/char/n_tty.c' NULL Pointer Dereference Denial of Service Vulnerability

The Linux kernel is prone to a local denial-of-service vulnerability.

Attackers can exploit this issue to crash the affected kernel, denying service to legitimate users. Given the nature of this issue, attackers may also be able to execute arbitrary code, but this has not been confirmed.

This issue was introduced in Linux kernel 2.6.31.5.

Linux Kernel 'drivers/char/n_tty.c' NULL Pointer Dereference Denial of Service Vulnerability

To exploit this issue, an attacker requires local interactive access to a vulnerable computer.

Linux Kernel 'drivers/char/n_tty.c' NULL Pointer Dereference Denial of Service Vulnerability

Solution:
Currently we are not aware of any vendor-supplied patches. If you feel we are in error or if you are aware of more recent information, please mail us at: [email protected].

Linux Kernel 'drivers/char/n_tty.c' NULL Pointer Dereference Denial of Service Vulnerability

References:

• Bug 14605 - NULL Pointer Dereference drivers/char/n_tty.c (Kyle Bader)
  
• Linux kernel Homepage (kernel.org)
  
• Linux kernel TTY NULL Pointer Dereference Race Condition (xorl)