Title:Ubuntu linux kernel shiftfs file system double free vulnerability (CVE-2021-3492) Description:Shiftfs, an out-of-tree stacking file system included in Ubuntu Linux kernels, did not properly handle faults occurring during copy_from_user() correctly. These could lead to either a double-free situation or memory not being freed at all. An attacker could use this to cause a denial of service (kernel memory exhaustion) or gain privileges via executing arbitrary code. AKA ZDI-CAN-13562.
Description
PoC for CVE-2021-3492 used at Pwn2Own 2021
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