{"id":"CVE-2026-64257","summary":"smb: client: reject overlapping data areas in SMB2 responses","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: reject overlapping data areas in SMB2 responses\n\nCommit 53b7c271f06b (\"smb: client: restrict implied bcc[0] exemption to\nresponses without data area\") restricted the implied bcc[0] length\nexception to responses without a data area. However, the overlap\nhandling in __smb2_calc_size() clears data_length, which can make an\ninvalid response appear to have no data area and so qualify for the\nexception.\n\nTrack data area overlap separately and reject such responses before\napplying the length compatibility exceptions.","modified":"2026-10-08T02:51:30.544138816Z","published":"2026-07-25T08:49:09.345Z","related":["SUSE-SU-2026:23477-1","SUSE-SU-2026:23481-1","SUSE-SU-2026:23528-1","SUSE-SU-2026:23529-1","SUSE-SU-2026:4120-1","SUSE-SU-2026:4254-1","openSUSE-SU-2026:11476-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64257.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/36bfa52459e45c0d5b668de2f1c91f6dc5c67775"},{"type":"WEB","url":"https://git.kernel.org/stable/c/445ece263131780dee273d727a4d6f11934feec7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4a9d2657d3e05f6ed09c148cb127b4e58702275f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/57cba95f0e97c6f6e45e6731da30aff091bd7460"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8986c932905ea508d66da421eb2eb6e676ace1fe"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fdafa1e68dc75045b7b617e6e7d2854950804d83"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64257.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64257"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"31c6312608c60b72a1feb99a5afb680645a3e8a3"},{"fixed":"445ece263131780dee273d727a4d6f11934feec7"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"573e502d14714d2947e22e7eff40ec20a6a44a42"},{"fixed":"36bfa52459e45c0d5b668de2f1c91f6dc5c67775"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"419ec1b604d7fb60c10aec2dc062371f9fcd4940"},{"fixed":"4a9d2657d3e05f6ed09c148cb127b4e58702275f"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"ceb875a375dedbf51c9425c1d13a2d7a8435c08c"},{"fixed":"fdafa1e68dc75045b7b617e6e7d2854950804d83"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6e9d10f62773b99bd927940fd9cbdfe7207e23ff"},{"fixed":"57cba95f0e97c6f6e45e6731da30aff091bd7460"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"53b7c271f06be4dd5cfc8c6ef552a8355c891a7f"},{"fixed":"8986c932905ea508d66da421eb2eb6e676ace1fe"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.10.261"},{"fixed":"5.11"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.15.212"},{"fixed":"5.16"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"8d0bbc78046d264bbf6a574ea6f9072258a43e35"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"b6a381c01e2ac98a48e32ac0f2a45bbadd9e26b0"}]}],"versions":["v5.10.271","v5.10.270","v5.10.269","v5.10.268","v5.10.267","v5.10.266","v5.10.265","v5.10.264","v5.10.263","v5.10.262","v5.10.261","v5.15.222","v5.15.221","v5.15.220","v5.15.219","v5.15.218","v5.15.217","v5.15.216","v5.15.215","v5.15.214","v5.15.213","v5.15.212"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64257.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"}]}