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TITLE:
Linux Kernel Incorrect proto_ops Initialisation NULL Pointer
Dereference

SECUNIA ADVISORY ID:
SA36278

VERIFY ADVISORY:
http://secunia.com/advisories/36278/

DESCRIPTION:
A vulnerability has been reported in the Linux Kernel, which can be
exploited by malicious, local users to cause a DoS (Denial of
Service) and potentially gain escalated privileges.

The vulnerability is caused due to the incorrect initialisation of
the proto_ops structure for certain protocols (e.g. PF_APPLETALK,
PF_IPX, PF_IRDA, PF_X25, PF_AX25 families, PF_BLUETOOTH, PF_IUCV,
PF_INET6 (with IPPROTO_SCTP), PF_PPPOX, and PF_ISDN), which can be
exploited to cause a NULL pointer dereference when triggering the
"sock_sendpage()" function for an incorrectly initialised socket.

SOLUTION:
Fixed in version 2.6.31-rc6.

PROVIDED AND/OR DISCOVERED BY:
Tavis Ormandy and Julien Tinnes, Google Security Team

ORIGINAL ADVISORY:
http://archives.neohapsis.com/archives/fulldisclosure/2009-08/0174.html
http://blog.cr0.org/2009/08/linux-null-pointer-dereference-due-to.html

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