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The join_session_keyring function in security/keys/process_keys.c in the Linux kernel before 4.4.1 mishandles object references in a certain error case, which allows local users to gain privileges or cause a denial of service (integer overflow and use-after-free) via crafted keyctl commands.
4.4.1 Changelog:
Quote:
commit e4a46f02b1d0eaadea4e6b00e29922cd00d6de53
Author: Yevgeny Pats <xxxxxxxxxxxxxxxx>
Date: Tue Jan 19 22:09:04 2016 +0000
KEYS: Fix keyring ref leak in join_session_keyring()
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