{"id":"CVE-2026-31433","summary":"ksmbd: fix potencial OOB in get_file_all_info() for compound requests","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix potencial OOB in get_file_all_info() for compound requests\n\nWhen a compound request consists of QUERY_DIRECTORY + QUERY_INFO\n(FILE_ALL_INFORMATION) and the first command consumes nearly the entire\nmax_trans_size, get_file_all_info() would blindly call smbConvertToUTF16()\nwith PATH_MAX, causing out-of-bounds write beyond the response buffer.\nIn get_file_all_info(), there was a missing validation check for\nthe client-provided OutputBufferLength before copying the filename into\nFileName field of the smb2_file_all_info structure.\nIf the filename length exceeds the available buffer space, it could lead to\npotential buffer overflows or memory corruption during smbConvertToUTF16\nconversion. This calculating the actual free buffer size using\nsmb2_calc_max_out_buf_len() and returning -EINVAL if the buffer is\ninsufficient and updating smbConvertToUTF16 to use the actual filename\nlength (clamped by PATH_MAX) to ensure a safe copy operation.","modified":"2026-07-08T07:14:28.255523356Z","published":"2026-04-22T08:15:11.719Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31433.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/358cdaa1f7fbf2712cb4c5f6b59cb9a5c673c5fe"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3a852f9d1c981fb14f6bf4e24999e0ea8088a7d7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4cca3eff2099b18672934a39cee70aed835d652c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7aec5a769d2356cbf344d85bcfd36de592ac96a5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9d7032851d6f5adbe2739601ca456c0ad3b422f0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b0cd9725fe2bcc9f37d096b132318a9060373f5d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/beef2634f81f1c086208191f7228bce1d366493d"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31433.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-31433"},{"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":"f2283680a80571ca82d710bc6ecd8f8beac67d63"},{"fixed":"3a852f9d1c981fb14f6bf4e24999e0ea8088a7d7"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"9f297df20d93411c0b4ddad7f88ba04a7cd36e77"},{"fixed":"4cca3eff2099b18672934a39cee70aed835d652c"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d"},{"fixed":"358cdaa1f7fbf2712cb4c5f6b59cb9a5c673c5fe"},{"fixed":"7aec5a769d2356cbf344d85bcfd36de592ac96a5"},{"fixed":"b0cd9725fe2bcc9f37d096b132318a9060373f5d"},{"fixed":"9d7032851d6f5adbe2739601ca456c0ad3b422f0"},{"fixed":"beef2634f81f1c086208191f7228bce1d366493d"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.15.145"},{"fixed":"5.15.203"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.1.71"},{"fixed":"6.1.168"}]}],"versions":["v5.15.202","v5.15.201","v5.15.200","v5.15.199","v5.15.198","v5.15.197","v5.15.196","v5.15.195","v5.15.194","v5.15.193","v5.15.192","v5.15.191","v5.15.190","v5.15.189","v5.15.188","v5.15.187","v5.15.186","v5.15.185","v5.15.184","v5.15.183","v5.15.182","v5.15.181","v5.15.180","v5.15.179","v5.15.178","v5.15.177","v5.15.176","v5.15.175","v5.15.174","v5.15.173","v5.15.172","v5.15.171","v5.15.170","v5.15.169","v5.15.168","v5.15.167","v5.15.166","v5.15.165","v5.15.164","v5.15.163","v5.15.162","v5.15.161","v5.15.160","v5.15.159","v5.15.158","v5.15.157","v5.15.156","v5.15.155","v5.15.154","v5.15.153","v5.15.152","v5.15.151","v5.15.150","v5.15.149","v5.15.148","v5.15.147","v5.15.146","v5.15.145","v6.1.167","v6.1.166","v6.1.165","v6.1.164","v6.1.163","v6.1.162","v6.1.161","v6.1.160","v6.1.159","v6.1.158","v6.1.157","v6.1.156","v6.1.155","v6.1.154","v6.1.153","v6.1.152","v6.1.151","v6.1.150","v6.1.149","v6.1.148","v6.1.147","v6.1.146","v6.1.145","v6.1.144","v6.1.143","v6.1.142","v6.1.141","v6.1.140","v6.1.139","v6.1.138","v6.1.137","v6.1.136","v6.1.135","v6.1.134","v6.1.133","v6.1.132","v6.1.131","v6.1.130","v6.1.129","v6.1.128","v6.1.127","v6.1.126","v6.1.125","v6.1.124","v6.1.123","v6.1.122","v6.1.121","v6.1.120","v6.1.119","v6.1.118","v6.1.117","v6.1.116","v6.1.115","v6.1.114","v6.1.113","v6.1.112","v6.1.111","v6.1.110","v6.1.109","v6.1.108","v6.1.107","v6.1.106","v6.1.105","v6.1.104","v6.1.103","v6.1.102","v6.1.101","v6.1.100","v6.1.99","v6.1.98","v6.1.97","v6.1.96","v6.1.95","v6.1.94","v6.1.93","v6.1.92","v6.1.91","v6.1.90","v6.1.89","v6.1.88","v6.1.87","v6.1.86","v6.1.85","v6.1.84","v6.1.83","v6.1.82","v6.1.81","v6.1.80","v6.1.79","v6.1.78","v6.1.77","v6.1.76","v6.1.75","v6.1.74","v6.1.73","v6.1.72","v6.1.71"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-31433.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.15.203"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.168"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.131"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.6.0"},{"fixed":"6.12.80"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.18.21"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.19.11"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-31433.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}