CVE-2026-58083
Local kernel use-after-free in kqueue copy during fork enabling privilege escalation
Is CVE-2026-58083 being exploited?
Not confirmed. CVE-2026-58083 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.12% probability of exploitation in the next 30 days.
How severe is CVE-2026-58083?
CVE-2026-58083 is rated High with a CVSS score of 8.4. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-58083?
Yes. A fix has been recorded for CVE-2026-58083. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-58083 affect?
CVE-2026-58083 affects Kernels implementing kqueue/knote (FreeBSD), NetBSD, OpenBSD, macOS. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-58083?
Apply vendor kernel updates when released; restrict untrusted local accounts; monitor for privilege escalations.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
An unprivileged local user can trigger a kernel use-after-free during fork to escalate privileges to root.
Patch when possible
- affected>= 15.1-RELEASE and < p2
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.