CVE-2026-58100 — Memory safety bugs in kqueue copy-on-fork implementation

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
FreeBSD / FreeBSD	affected 15.1-RELEASE before p4

CWE

CWE-362, CWE-125

References

https://security.freebsd.org/advisories/FreeBSD-SA-26:65.kqueue.asc

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.