A flaw was found in libnbd. A server can reply with a block size larger than 2^63 (the NBD spec states the size is a 64-bit unsigned value). This issue could lead to an application crash or other unintended behavior for NBD clients that doesn't treat the return value of the nbd_get_size() function correctly.
Exploitability
AV:AAC:HPR:NUI:NScope
S:UImpact
C:NI:NA:H5.3/CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:HOther