{"cve":"CVE-2025-21666","nvd":{"published":"2025-01-31T12:15:27.763","modified":"2026-06-17T08:43:58.173","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nvsock: prevent null-ptr-deref in vsock_*[has_data|has_space]\n\nRecent reports have shown how we sometimes call vsock_*_has_data()\nwhen a vsock socket has been de-assigned from a transport (see attached\nlinks), but we shouldn't.\n\nPrevious commits should have solved the real problems, but we may have\nmore in the future, so to avoid null-ptr-deref, we can return 0\n(no space, no data available) but with a warning.\n\nThis way the code should continue to run in a nearly consistent state\nand have a warning that allows us to debug future problems.","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-476"],"references":["https://git.kernel.org/stable/c/91751e248256efc111e52e15115840c35d85abaf","https://git.kernel.org/stable/c/9e5fed46ccd2c34c5fa5a9c8825ce4823fdc853e","https://git.kernel.org/stable/c/b52e50dd4fabd12944172bd486a4f4853b7f74dd","https://git.kernel.org/stable/c/bc9c49341f9728c31fe248c5fbba32d2e81a092b","https://git.kernel.org/stable/c/c23d1d4f8efefb72258e9cedce29de10d057f8ca"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T21:58:41.599736885+00:00"},"epss":{"cve":"CVE-2025-21666","score":0.00224,"percentile":0.13051,"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."]}