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Linux Kernel Multiple Denial of Service Vulnerabilities
Release Date: 2005-11-29 Last Update: 2005-12-23 Views: 16,628
Secunia Advisory SA17786
Where:
Local system
Impact:
DoS,
Solution Status:
Vendor Patch
CVE Reference(s):
Description
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.
Further details available to Secunia VIM customers
Provided and/or discovered by:
1) Oleg Nesterov
2) Avi Kivity
Original Advisory:
Kernel.org:
http://www.kernel.org/pub/linux/kernel/v2.6/testing/ChangeLog-2.6.15-rc3
http://www.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=7ed0175a462c4c30f6df6fac1cccac058f997739
http://www.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=f3a9388e4ebea57583272007311fffa26ebbb305
http://www.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=479ef592f3664dd629417098c8599261c0f689ab
http://www.kernel.org/pub/linux/kernel/v2.6/testing/ChangeLog-2.6.15-rc2
http://kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=dc15ae14e97ee9d5ed740cbb0b94996076d8b37e
Red Hat Bugzilla:
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=174078
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=174337
Deep Links:
Links available to Secunia VIM customers
Do you have additional information related to this advisory?
Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com
Subject: Linux Kernel Multiple Denial of Service Vulnerabilities
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