CVE-2010-2495

The pppol2tp_xmit function in drivers/net/pppol2tp.c in the L2TP implementation in the Linux kernel before 2.6.34 does not properly validate certain values associated with an interface, which allows attackers to cause a denial of service (NULL pointer dereference and OOPS) or possibly have unspecified other impact via vectors related to a routing change.

Weakness

A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit.

Affected Software

Potential Mitigations

References

• http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=3feec9095d12e311b7d4eb7fe7e5dfa75d4a72a5
• http://lists.opensuse.org/opensuse-security-announce/2010-08/msg00000.html
• http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.34
• http://www.openwall.com/lists/oss-security/2010/06/23/3
• http://www.openwall.com/lists/oss-security/2010/07/04/2
• http://www.openwall.com/lists/oss-security/2010/07/04/3
• http://www.openwall.com/lists/oss-security/2010/07/06/11
• http://www.ubuntu.com/usn/USN-1000-1
• https://bugzilla.redhat.com/show_bug.cgi?id=607054
• http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=3feec9095d12e311b7d4eb7fe7e5dfa75d4a72a5
• http://lists.opensuse.org/opensuse-security-announce/2010-08/msg00000.html
• http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.34
• http://www.openwall.com/lists/oss-security/2010/06/23/3
• http://www.openwall.com/lists/oss-security/2010/07/04/2
• http://www.openwall.com/lists/oss-security/2010/07/04/3
• http://www.openwall.com/lists/oss-security/2010/07/06/11
• http://www.ubuntu.com/usn/USN-1000-1
• https://bugzilla.redhat.com/show_bug.cgi?id=607054