{"id":"CVE-2026-49422","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-49422","generatedAt":"2026-10-28T02:14:17.259Z","title":"The bug may be exploitable by an unprivileged local user to escalate privileges.","description":"The RACK setsockopt(2) handler drops the connection lock in order to copy option data from userspace, then reacquires the lock.  After reacquiring, it verifies that the TCP stack had not been switched away, but did not reload its pointer to the stack's per-connection control block.  If userspace switches stacks twice during this window, the check will succeed but the saved pointer will refer to freed memory.\n\nThe bug may be exploitable by an unprivileged local user to escalate privileges.","published":"2026-08-19T06:17:41.000Z","lastModified":"2026-09-01T20:20:01.000Z","status":"Analyzed","sourceIdentifier":"secteam@freebsd.org","cvss":{"version":"3.1","score":8.4,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-416"],"affected":["freebsd/freebsd"],"epss":{"score":0.00168,"percentile":0.0595,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.17%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://security.freebsd.org/advisories/FreeBSD-SA-26:43.tcp.asc","tags":["Vendor Advisory"],"source":"secteam@freebsd.org"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-49422","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}