{"id":"CVE-2025-68219","summary":"cifs: fix memory leak in smb3_fs_context_parse_param error path","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: fix memory leak in smb3_fs_context_parse_param error path\n\nAdd proper cleanup of ctx-\u003esource and fc-\u003esource to the\ncifs_parse_mount_err error handler. This ensures that memory allocated\nfor the source strings is correctly freed on all error paths, matching\nthe cleanup already performed in the success path by\nsmb3_cleanup_fs_context_contents().\nPointers are also set to NULL after freeing to prevent potential\ndouble-free issues.\n\nThis change fixes a memory leak originally detected by syzbot. The\nleak occurred when processing Opt_source mount options if an error\nhappened after ctx-\u003esource and fc-\u003esource were successfully\nallocated but before the function completed.\n\nThe specific leak sequence was:\n1. ctx-\u003esource = smb3_fs_context_fullpath(ctx, '/') allocates memory\n2. fc-\u003esource = kstrdup(ctx-\u003esource, GFP_KERNEL) allocates more memory\n3. A subsequent error jumps to cifs_parse_mount_err\n4. The old error handler freed passwords but not the source strings,\ncausing the memory to leak.\n\nThis issue was not addressed by commit e8c73eb7db0a (\"cifs: client:\nfix memory leak in smb3_fs_context_parse_param\"), which only fixed\nleaks from repeated fsconfig() calls but not this error path.\n\nPatch updated with minor change suggested by kernel test robot","modified":"2026-04-02T13:03:27.028501Z","published":"2025-12-16T13:57:13.461Z","related":["MGASA-2026-0017","MGASA-2026-0018"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/68xxx/CVE-2025-68219.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/37010021d7e0341bb241ca00bcbae31f2c50b23f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/48d69290270891f988e72edddd9688c20515421d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7627864dc3121f39e220f5253a227edf472de59e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7e4d9120cfa413dd34f4f434befc5dbe6c38b2e5"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/68xxx/CVE-2025-68219.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-68219"},{"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":"24e0a1eff9e2b9835a6e7c17039dfb6ecfd81f1f"},{"fixed":"7627864dc3121f39e220f5253a227edf472de59e"},{"fixed":"48d69290270891f988e72edddd9688c20515421d"},{"fixed":"37010021d7e0341bb241ca00bcbae31f2c50b23f"},{"fixed":"7e4d9120cfa413dd34f4f434befc5dbe6c38b2e5"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-68219.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"6.6.118"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.60"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.17.10"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-68219.json"}}],"schema_version":"1.7.5"}