Some vulnerabilities have been reported in the Linux Kernel, which can be exploited by malicious, local users to bypass certain security restrictions and cause a DoS (Denial of Service), and malicious people to cause a DoS.
1) An error within the "decode_choice()" function in net/netfilter/bf_conntrack_h323_asn1.c when handling choices that are still encoded in the fixed-size bitfield can be exploited to cause access to undefined types, resulting in a crash.
2) MSR bits are cleared after copying the state into the thread_struct. This can be exploited to cause corruption of the floating point state after returning from signal handlers, resulting in a DoS.
Successful exploitation requires a PowerPC based architecture.
3) The "do_change_type()" function in fs/namespace.c does not properly check for "CAP_SYS_ADMIN" privileges before performing certain operations. This can be exploited to e.g. mark private mounts as shared or mark a mount as unbindable.
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Subject: Linux Kernel Security Bypass and Multiple Denial of Service Vulnerabilities
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