{"id":"CVE-2025-40268","title":"In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: client: fix memory leak in smb3_fs_context_parse_param\n\nThe user calls fsconfig twice, but when the program exits, free() only\nfrees ctx->source for the second fs…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: client: fix memory leak in smb3_fs_context_parse_param\n\nThe user calls fsconfig twice, but when the program exits, free() only\nfrees ctx->source for the second fs…","severity":"none","published":"2025-12-06","updated":"2026-10-15","sourceUpdated":"2026-10-15T20:10:00.197","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-40268","references":[{"url":"https://git.kernel.org/stable/c/4515743cc7a42e1d67468402a6420c195532a6fa","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/48c17341577e25a22feb13d694374b61d974edbc","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/868fc62811d3fabcf5685e14f36377a855d5412d","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/e8c73eb7db0a498cd4b22d2819e6ab1a6f506bd6","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd"],"epss":0.00187,"epssPercentile":0.08259,"ingestedAt":"2026-10-27T18:12:09.301Z","slug":"CVE-2025-40268","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ncifs: client: fix memory leak in smb3_fs_context_parse_param\n\nThe user calls fsconfig twice, but when the program exits, free() only\nfrees ctx->source for the second fsconfig, not the first.\nRegarding fc->source, there is no code in the fs context related to its\nmemory reclamation.\n\nTo fix this memory leak, release the source memory corresponding to ctx\nor fc before each parsing.\n\nsyzbot reported:\nBUG: memory leak\nunreferenced object 0xffff888128afa360 (size 96):\n  backtrace (crc 79c9c7ba):\n    kstrdup+0x3c/0x80 mm/util.c:84\n    smb3_fs_context_parse_param+0x229b/0x36c0 fs/smb/client/fs_context.c:1444\n\nBUG: memory leak\nunreferenced object 0xffff888112c7d900 (size 96):\n  backtrace (crc 79c9c7ba):\n    smb3_fs_context_fullpath+0x70/0x1b0 fs/smb/client/fs_context.c:629\n    smb3_fs_context_parse_param+0x2266/0x36c0 fs/smb/client/fs_context.c:1438\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":[]}