The KEYCTL_JOIN_SESSION_KEYRING operation in the Linux kernel before
18.104.22.168 contains an error path that does not properly release the
session management semaphore, which allows local users or remote
attackers to cause a denial of service (semaphore hang) via a new
session keyring (1) with an empty name string, (2) with a long name
string, (3) with the key quota reached, or (4) ENOMEM.
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disclosed, or updated in CVE.
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