{"apiVersion":"1.0","identifier":"CVE-2026-80548","description":"In the Linux kernel, the following vulnerability has been resolved: s390/vfio_ccw: Selectively expand io_mutex The io_mutex was defined to serialize the io_regions, but then has also sort of been associated with the I/O themselves because of the close relationship they share. With the handful of races that are possible, the choices are either to: A) expand the scope of io_mutex to close these remaining windows, or B) reduce the scope of io_mutex to just io_region, and introduce a new lock mechanism for the remaining I/O resources This patch implements A, since B brings with it a lot more interactions that would need to be tracked and kept in a correct hierarchy. It also takes advantage of the workqueue element for cp_free() that now gets called out of fsm_notoper(), which could be invoked out of an interrupt context and thus cannot acquire a mutex itself.","publishedAt":"2026-08-26T15:17:09","lastModifiedAt":"2026-08-27T13:18:39","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-80548","cvssScore":8.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","epssProbability":0.00129,"riskScore":0.89,"affectedProduct":"Linux kernel","affectedVersions":"unknown","vulnerabilityType":"Kernel","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-80548","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-80548","en":"https://www.redsauce.net/en/cves/CVE-2026-80548","fr":"https://www.redsauce.net/fr/cves/CVE-2026-80548","pt":"https://www.redsauce.net/pt/cves/CVE-2026-80548","de":"https://www.redsauce.net/de/cves/CVE-2026-80548","sk":"https://www.redsauce.net/sk/cves/CVE-2026-80548","el":"https://www.redsauce.net/el/cves/CVE-2026-80548"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-80548"}}