Linux Kernel 4.4.1 – REFCOUNT Overflow/Use-After-Free in Keyrings Privilege Escalation vulnerability


CVE-2016-0728: 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.

Impact: Local attackers may exploit this issue to gain root privileges.

Mitigation: Vendor has released patch version.

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