{"id":"CVE-2025-68219","title":"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->source and fc->source to the\ncifs_parse_mount_err error handler","summary":"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->source and fc->source to the\ncifs_parse_mount_err error handler. This ensure…","severity":"none","published":"2025-12-16","updated":"2026-10-14","sourceUpdated":"2026-10-14T13:10:00.187","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-68219","references":[{"url":"https://git.kernel.org/stable/c/37010021d7e0341bb241ca00bcbae31f2c50b23f","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/48d69290270891f988e72edddd9688c20515421d","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/7627864dc3121f39e220f5253a227edf472de59e","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/7e4d9120cfa413dd34f4f434befc5dbe6c38b2e5","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd"],"epss":0.00199,"epssPercentile":0.09063,"ingestedAt":"2026-10-14T13:30:58.458Z","slug":"CVE-2025-68219","body":"## Overview\n\nIn 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->source and fc->source 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->source and fc->source were successfully\nallocated but before the function completed.\n\nThe specific leak sequence was:\n1. ctx->source = smb3_fs_context_fullpath(ctx, '/') allocates memory\n2. fc->source = kstrdup(ctx->source, 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\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}