The get_instantiation_keyring function in security/keys/keyctl.c in
the KEYS subsystem in the Linux kernel before 2.6.32-rc5 does not
properly maintain the reference count of a keyring, which allows local
users to gain privileges or cause a denial of service (OOPS) via
vectors involving calls to this function without specifying a keyring
by ID, as demonstrated by a series of keyctl request2 and keyctl list
Note:References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MLIST:[oss-security] 20091022 CVE request: kernel: get_instantiation_keyring() should inc the keyring refcount in all cases
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