{"cve":"CVE-2026-45256","nvd":{"published":"2026-06-26T15:16:39.170","modified":"2026-06-26T18:58:48.590","status":"Analyzed","description":"When used to deliver a signal to a specific thread, thr_kill2(2) called p_cansignal() to determine whether the operation was permitted but did not check the result before delivering the signal.  The signal was sent even when the permission check failed.  The system call returned the resulting error to the caller, but by then the signal had already been delivered.\n\nThe missing check allows an unprivileged local user who knows or can guess a target's process and thread IDs to send any signal to a process they would not normally be permitted to signal, including processes owned by other users or by root.  The same check enforces jail boundaries, so a jailed process can signal processes on the host or in other jails.  Thread IDs are allocated globally and sequentially, and so can be discovered by brute force with no visibility into the target.\n\nAn attacker can stop or terminate arbitrary processes, including critical system daemons, resulting in a Denial of Service (DoS).","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":["CWE-269"],"references":["https://security.freebsd.org/advisories/FreeBSD-SA-26:25.thr.asc"],"products":["freebsd:freebsd"],"source":"nvd","synced_at":"2026-10-19T22:41:17.107060303+00:00"},"epss":{"cve":"CVE-2026-45256","score":0.00122,"percentile":0.01987,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}