CVE•Published 2026-04-22•Modified 2026-05-01•1 article on news•6 live references•NVD data

CVE-2026-5398Freebsd · Freebsd

Vulnerability data via NVD (ingested)

CVSS v3.1

8.4

HIGH

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS percentile

Exploit Prediction Scoring System · top 96% of all CVEs

Weaknesses (CWE)

CWE-416Use After Free

Description

The implementation of TIOCNOTTY failed to clear a back-pointer from the structure representing the controlling terminal to the calling process' session. If the invoking process then exits, the terminal structure may end up containing a pointer to freed memory. A malicious process can abuse the dangling pointer to grant itself root privileges.

Timeline

Published 2026-04-22

Modified 2026-05-01

External references

NVD MITRE Exploit-DB GitHub PoC Sploitus VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag263 hosts

vuln:CVE-2026-5398

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · OS

os:"Freebsd"

Hosts Shodan identified as running Freebsd.

More intel sources (5)

Shodan report

vuln:CVE-2026-5398

Country / ASN / product breakdown for the vuln query.

Censys

vulnerabilities.cve_id: CVE-2026-5398