CVE-2026-58100
Low risk· EPSS 3%Exploitation Probability (EPSS)
Low risk3th percentile - higher than 3% of all known CVEs
Summary
kqueue_fork_copy_knote() indexed into the child's file descriptor table using a knote's file descriptor number without a bounds check. Because the child's table is copied before knotes are transferred, a concurrent thread in the parent could grow the parent's table and register knotes with file descriptor numbers beyond the end of the child's table, causing an out-of-bounds read.
Risk Assessment
An unprivileged local user may be able to exploit these races to escalate privileges. Affects systems with a vulnerable kernel handling kqueue.
Recommendation
Update the system to a kernel version containing the fix that adds a bounds check in kqueue_fork_copy_knote().
Other vulnerabilities in kqueue
Original NVD description (English source)
kqueue_fork_copy_knote() indexed into the child's file descriptor table using a knote's file descriptor number without a bounds check. Because the child's table is copied before knotes are transferred, a concurrent thread in the parent could grow the parent's table and register knotes with file descriptor numbers beyond the end of the child's table, causing an out-of-bounds read. An unprivileged local user may be able to exploit these races to escalate privileges.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS