{"id":"CVE-2026-80550","revision":"7007ad8da4bf44edabbeb25bef29606d","records":[{"revision":"7007ad8da4bf44edabbeb25bef29606d","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-80550","aliases":[],"title":"s390/vfio_ccw: Fix out of bounds check on CCW array","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ns390/vfio_ccw: Fix out of bounds check on CCW array\n\nThe routine ccwchain_calc_length() counts the number of channel\ncommand words (CCWs) that are chained together in a single channel\nprogram, and rejects anything larger than CCWCHAIN_LEN_MAX (256) CCWs.\n\nThe loop itself is \"do..while (count < 257)\", and while the logic in\nis_cpa_within_range() correctly adjusts between the 0-index array of\nCCWs and the count of CCWs starting at 1, this means it would look\nat a possible 257th CCW before ending the loop and (correctly)\nreturning an error.\n\nFix this by restructuring the loop to break as soon as 256 CCWs\n(thus indexes 0-255) are examined, without looking at memory\noutside the range.","state":0,"publishedAt":"2026-08-26T14:37:19.956+00:00","modifiedAt":"2026-10-16T19:26:26.153+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_cp.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"0a19e61e6d4c6192077ead760ba0a2d350987d4c\",\n                            \"lessThan\": \"0282fb1c4b638eecfe2cc558092c460911d8f7e2\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"0a19e61e6d4c6192077ead760ba0a2d350987d4c\",\n                            \"lessThan\": \"907adc667d902fafbdb2d740d57b55bd025dc4cd\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"0a19e61e6d4c6192077ead760ba0a2d350987d4c\",\n                            \"lessThan\": \"f20be33d093ce7630c17ff7ed93caf7eaf8ac1a3\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"0a19e61e6d4c6192077ead760ba0a2d350987d4c\",\n                            \"lessThan\": \"af3f80ca4c8b17f20f9e588def076288fdb49e65\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"0a19e61e6d4c6192077ead760ba0a2d350987d4c\",\n                            \"lessThan\": \"499a8a66b1598bfab97182aed15e0f1646074a3d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"0a19e61e6d4c6192077ead760ba0a2d350987d4c\",\n                            \"lessThan\": \"4c2e1d359d7a2b82cdf3254e4e480af9417f99fb\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"0a19e61e6d4c6192077ead760ba0a2d350987d4c\",\n                            \"lessThan\": \"d5d096cd9369e986d4e5153baa86b8b35c283e09\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"0a19e61e6d4c6192077ead760ba0a2d350987d4c\",\n                            \"lessThan\": \"a005b7f1a491ffda61bff0fd0f6548f8986fb977\",\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_cp.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"4.12\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"4.12\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.266\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.217\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.184\",\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:N/UI:N/S:C/C:H/I:N/A:L","score":7.9,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/0282fb1c4b638eecfe2cc558092c460911d8f7e2","https://git.kernel.org/stable/c/907adc667d902fafbdb2d740d57b55bd025dc4cd","https://git.kernel.org/stable/c/f20be33d093ce7630c17ff7ed93caf7eaf8ac1a3","https://git.kernel.org/stable/c/af3f80ca4c8b17f20f9e588def076288fdb49e65","https://git.kernel.org/stable/c/499a8a66b1598bfab97182aed15e0f1646074a3d","https://git.kernel.org/stable/c/4c2e1d359d7a2b82cdf3254e4e480af9417f99fb","https://git.kernel.org/stable/c/d5d096cd9369e986d4e5153baa86b8b35c283e09","https://git.kernel.org/stable/c/a005b7f1a491ffda61bff0fd0f6548f8986fb977"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-80550","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-80550","identifiers":["CVE-2026-80550"]},"retained":false,"historicalAffected":[]}],"coverage":[]}