Some vulnerabilities have been reported in the Linux Kernel, which potentially can be exploited by malicious, local users to cause a DoS (Denial of Service).
1) An error in the auto-reap of child processes that have ptrace attached can lead to dangling ptrace references. This may be exploited by local users to cause a kernel crash.
2) The use of "printk()" in the "time_out_leases()" function in "/fs/locks.c" can consume a large amount of kernel log space. This can be exploited by local users to cause a DoS by generating a large number of broken leases.
3) A memory leak error exists in the VFS file lease handling code in "/fs/locks.c". This may be exploited by local users to cause a DoS (memory exhaustion) by performing certain Samba requests that causes an "fasync" entry to be re-allocated by the "fcntl_setlease()" function after the "fasync" queue has already been cleaned by the "locks_delete_lock()" function.
4) An integer overflow error exists in the "invalidate_inode_pages2_range()" function of "/mm/truncate.c". This can be exploited by local users to cause a DoS.
The vulnerabilities have been reported in the 2.6 kernel branch.
Solution: The vulnerabilities have been fixed in version 2.6.15-rc3.
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Subject: Linux Kernel Multiple Denial of Service Vulnerabilities
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