The evm_update_evmxattr function in
security/integrity/evm/evm_crypto.c in the Linux kernel before 3.7.5,
when the Extended Verification Module (EVM) is enabled, allows local
users to cause a denial of service (NULL pointer dereference and
system crash) or possibly have unspecified other impact via an
attempted removexattr operation on an inode of a sockfs filesystem.
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