{"id":"CVE-2026-80548","revision":"af0df03eb6394fa98def3d3ecbd052a1","records":[{"revision":"af0df03eb6394fa98def3d3ecbd052a1","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-80548","aliases":[],"title":"s390/vfio_ccw: Selectively expand io_mutex","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ns390/vfio_ccw: Selectively expand io_mutex\n\nThe io_mutex was defined to serialize the io_regions, but then has\nalso sort of been associated with the I/O themselves because of\nthe close relationship they share.\n\nWith the handful of races that are possible, the choices are either to:\n A) expand the scope of io_mutex to close these remaining windows, or\n B) reduce the scope of io_mutex to just io_region, and introduce a new\n    lock mechanism for the remaining I/O resources\n\nThis patch implements A, since B brings with it a lot more interactions\nthat would need to be tracked and kept in a correct hierarchy. It also\ntakes advantage of the workqueue element for cp_free() that now gets\ncalled out of fsm_notoper(), which could be invoked out of an interrupt\ncontext and thus cannot acquire a mutex itself.","state":0,"publishedAt":"2026-08-26T14:37:18.759+00:00","modifiedAt":"2026-10-16T19:26:25.857+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/s390/cio/vfio_ccw_chp.c\",\n                        \"drivers/s390/cio/vfio_ccw_cp.c\",\n                        \"drivers/s390/cio/vfio_ccw_drv.c\",\n                        \"drivers/s390/cio/vfio_ccw_fsm.c\",\n                        \"drivers/s390/cio/vfio_ccw_private.h\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"4f76617378ee97c557b526cb58d3c61eb0a9c963\",\n                            \"lessThan\": \"dab6a6627b0b0cce23653e99c7b0bf8c6cfd82e0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4f76617378ee97c557b526cb58d3c61eb0a9c963\",\n                            \"lessThan\": \"56d7488533ceac4e986e96e15c9e487a2245bc01\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4f76617378ee97c557b526cb58d3c61eb0a9c963\",\n                            \"lessThan\": \"f72a51810d49411bd8cad0c2df8592320a2fe5cc\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4f76617378ee97c557b526cb58d3c61eb0a9c963\",\n                            \"lessThan\": \"2ba9efdf9ebedc4e54df4b56aa3b43a65f7967cd\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4f76617378ee97c557b526cb58d3c61eb0a9c963\",\n                            \"lessThan\": \"b6aecea4b2b246f9fbd98a5712daa1193a60818e\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4f76617378ee97c557b526cb58d3c61eb0a9c963\",\n                            \"lessThan\": \"2a5ac0c0f1f7da33929211a2e41911bf72ee35d8\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4f76617378ee97c557b526cb58d3c61eb0a9c963\",\n                            \"lessThan\": \"34f4feff3e90bd09308fad0974e97113b23b812a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/s390/cio/vfio_ccw_chp.c\",\n                        \"drivers/s390/cio/vfio_ccw_cp.c\",\n                        \"drivers/s390/cio/vfio_ccw_drv.c\",\n                        \"drivers/s390/cio/vfio_ccw_fsm.c\",\n                        \"drivers/s390/cio/vfio_ccw_private.h\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.2\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.2\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.218\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.185\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.153\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.105\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.46\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1.10\",\n                            \"lessThanOrEqual\": \"7.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","score":8.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/dab6a6627b0b0cce23653e99c7b0bf8c6cfd82e0","https://git.kernel.org/stable/c/56d7488533ceac4e986e96e15c9e487a2245bc01","https://git.kernel.org/stable/c/f72a51810d49411bd8cad0c2df8592320a2fe5cc","https://git.kernel.org/stable/c/2ba9efdf9ebedc4e54df4b56aa3b43a65f7967cd","https://git.kernel.org/stable/c/b6aecea4b2b246f9fbd98a5712daa1193a60818e","https://git.kernel.org/stable/c/2a5ac0c0f1f7da33929211a2e41911bf72ee35d8","https://git.kernel.org/stable/c/34f4feff3e90bd09308fad0974e97113b23b812a"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-80548","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-80548","identifiers":["CVE-2026-80548"]},"retained":false,"historicalAffected":[]}],"coverage":[]}