{"id":"CVE-2026-72310","revision":"258cc271d4b74ab48c2903798dee4e94","records":[{"revision":"258cc271d4b74ab48c2903798dee4e94","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-72310","aliases":[],"title":"smb: client: fix overflow in passthrough ioctl bounds check","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix overflow in passthrough ioctl bounds check\n\nsmb2_ioctl_query_info() validates the PASSTHRU_FSCTL response payload\nbefore copying it to userspace.\n\nThe payload offset and length both come from 32-bit fields. The bounds\ncheck currently adds OutputOffset and qi.input_buffer_length directly, so\nthe addition can wrap in 32-bit arithmetic before the result is compared\nagainst the response buffer length.\n\nA malicious server can use a large OutputOffset and a small OutputCount\nto make the wrapped sum pass the bounds check. The later copy_to_user()\nthen reads from io_rsp + OutputOffset, outside the response buffer.\n\nUse size_add() for the offset plus length check so overflow is treated as\nout of bounds.","state":0,"publishedAt":"2026-08-15T05:55:26.539+00:00","modifiedAt":"2026-10-16T18:55:16.69+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                        \"fs/smb/client/smb2ops.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"2b1116bbe898aefdf584838448c6869f69851e0f\",\n                            \"lessThan\": \"175357ee0c596cb82054650dfa32fda51ad35aaa\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2b1116bbe898aefdf584838448c6869f69851e0f\",\n                            \"lessThan\": \"dbd126539c098dba3159ce7d34b10b2daddcbd0f\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2b1116bbe898aefdf584838448c6869f69851e0f\",\n                            \"lessThan\": \"63feb687e89a3a52a31e6e01764117cc500f1974\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2b1116bbe898aefdf584838448c6869f69851e0f\",\n                            \"lessThan\": \"160045fc943f6c46b227644261252c8a22b8a87a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2b1116bbe898aefdf584838448c6869f69851e0f\",\n                            \"lessThan\": \"b30771b69eafae750afb7385fbcc3d77ed3f3670\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2b1116bbe898aefdf584838448c6869f69851e0f\",\n                            \"lessThan\": \"1627e7d5c9b09721a141d07cedb178882f1ded67\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2b1116bbe898aefdf584838448c6869f69851e0f\",\n                            \"lessThan\": \"1a638c55f2db6cb2296e5e3138015dd8fd9d4aa9\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2b1116bbe898aefdf584838448c6869f69851e0f\",\n                            \"lessThan\": \"a4f27ad055392fa164f5649e89a3637b033c5fcc\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2005c32ec99ee2490e8131b3953f3f212009ffea\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5.4.69\",\n                            \"lessThan\": \"5.5\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\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                        \"fs/smb/client/smb2ops.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.5\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.5\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.261\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.212\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.178\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.145\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.97\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.40\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1.5\",\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:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","score":8.1,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/175357ee0c596cb82054650dfa32fda51ad35aaa","https://git.kernel.org/stable/c/dbd126539c098dba3159ce7d34b10b2daddcbd0f","https://git.kernel.org/stable/c/63feb687e89a3a52a31e6e01764117cc500f1974","https://git.kernel.org/stable/c/160045fc943f6c46b227644261252c8a22b8a87a","https://git.kernel.org/stable/c/b30771b69eafae750afb7385fbcc3d77ed3f3670","https://git.kernel.org/stable/c/1627e7d5c9b09721a141d07cedb178882f1ded67","https://git.kernel.org/stable/c/1a638c55f2db6cb2296e5e3138015dd8fd9d4aa9","https://git.kernel.org/stable/c/a4f27ad055392fa164f5649e89a3637b033c5fcc"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-72310","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-72310","identifiers":["CVE-2026-72310"]},"retained":false,"historicalAffected":[]}],"coverage":[]}