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Linux Kernel SACF Instruction and tmpfs Vulnerabilities
Secunia Advisory: SA13654
Release Date: 2004-12-27
Last Update: 2006-03-13
Popularity: 10,416 views

Critical:
Less critical
Impact: Privilege escalation
DoS
Where: Local system
Solution Status: Vendor Patch

OS:Linux Kernel 2.6.x

Secunia CVSS-2 Score: Available in Secunia business solutions

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Advisory Content (Page 1 of 3)[ 1 ] [ 2 ] [ 3 ]

Description:
Some vulnerabilities have been reported in the Linux Kernel, which can be exploited by malicious, local users to cause a DoS (Denial of Service) or gain escalated privileges.

1) The SACF (Set Address Space Control Fast) control instruction is handled insecurely on the S/390 platform allowing execution of arbitrary code with root privileges.

2) An input validation error in the "shmem_nopage()" function in the tmpfs file system can be exploited to crash the system.

3) A race condition in "sysfs_read_file()" and "sysfs_write_file()" functions in "/fs/sysfs/file.c" may be exploited to read kernel memory and cause a crash via large offsets in sysfs files.

4) A memory leak error in the handling of files that were opened with the O_DIRECT flag can potentially be exploited to exhaust all available kernel memory by repeatedly opening files in a certain way.

Change Page:
[ 1 ] [ 2 ] [ 3 ]



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