A flaw was found in libssh. When ProxyCommand is used, an unchecked fork() failure can be stored as process ID -1; during cleanup, signals may then be sent across the caller's accessible process tree, leading to local denial of service.
Exploitability
AV:LAC:HPR:LUI:RScope
S:CImpact
C:NI:NA:H5.3/CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:N/I:N/A:H