{"cve":"CVE-2026-80554","nvd":{"published":"2026-08-26T15:17:09.990","modified":"2026-10-16T20:17:59.867","status":"Received","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ns390/vfio_ccw: Limit the number of channel program segments\n\nThe processing of channel programs, and the CCWs within them, is done\nrecursively. As such, there is an arbitrary (but not architectural)\nlimit to the number of CCWs that can exist in a single channel program.\n\nThe vfio-ccw logic breaks these channel programs into segments whenever\nit encounters a Transfer-In-Channel (TIC) CCW, and the combined number\nof segments count towards the global limit. Impose an equivalent limit\nto the number of segments until such logic can be made non-recursive.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","score":9.3},"cwes":[],"references":["https://git.kernel.org/stable/c/06f4d6e5a8af6c2072e8cd39dbc512c683ca7fb2","https://git.kernel.org/stable/c/15fb4559a7fdf0b8725e433a71cfd03a1313a48b","https://git.kernel.org/stable/c/4ee94790490ae8dcc97df8597f07836c8a81bbcf","https://git.kernel.org/stable/c/5405c90d6a47b3014e74ee0618a162449abbbc93","https://git.kernel.org/stable/c/a1625f66eaa1200068a0e2c05bc90e65182fc4e3"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:50:17.453294893+00:00"},"epss":{"cve":"CVE-2026-80554","score":0.00196,"percentile":0.09172,"date":"2026-10-25"},"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."]}