{"id":"CVE-2025-40268","state":"PUBLISHED","title":"cifs: client: fix memory leak in smb3_fs_context_parse_param","description":"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 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","publishedAt":"2025-12-06T21:50:48.917Z","updatedAt":"2026-10-30T12:22:57.829Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"af1a3d2ba9543e99d78914d8fb88b61d0531d9a1","status":"affected","lessThan":"299bc05e1475a4aa1eb985ade8f39e68c1bba9b9","versionType":"git"},{"version":"af1a3d2ba9543e99d78914d8fb88b61d0531d9a1","status":"affected","lessThan":"868fc62811d3fabcf5685e14f36377a855d5412d","versionType":"git"},{"version":"af1a3d2ba9543e99d78914d8fb88b61d0531d9a1","status":"affected","lessThan":"48c17341577e25a22feb13d694374b61d974edbc","versionType":"git"},{"version":"af1a3d2ba9543e99d78914d8fb88b61d0531d9a1","status":"affected","lessThan":"4515743cc7a42e1d67468402a6420c195532a6fa","versionType":"git"},{"version":"af1a3d2ba9543e99d78914d8fb88b61d0531d9a1","status":"affected","lessThan":"e8c73eb7db0a498cd4b22d2819e6ab1a6f506bd6","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/client/fs_context.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.11","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.11","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.117","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.59","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.17.9","status":"unaffected","lessThanOrEqual":"6.17.*","versionType":"semver"},{"version":"6.18","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/client/fs_context.c"]}],"references":["https://git.kernel.org/stable/c/299bc05e1475a4aa1eb985ade8f39e68c1bba9b9","https://git.kernel.org/stable/c/868fc62811d3fabcf5685e14f36377a855d5412d","https://git.kernel.org/stable/c/48c17341577e25a22feb13d694374b61d974edbc","https://git.kernel.org/stable/c/4515743cc7a42e1d67468402a6420c195532a6fa","https://git.kernel.org/stable/c/e8c73eb7db0a498cd4b22d2819e6ab1a6f506bd6"],"weaknesses":[],"ingestedAt":"2026-10-30T12:40:04.423Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/40xxx/CVE-2025-40268.json","commit":"db8103c5921aac81d5d90efcf3745980dafabf49","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-40268","state":"PUBLISHED","datePublished":"2025-12-06T21:50:48.917Z","dateUpdated":"2026-10-30T12:22:57.829Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-04-16T07:20:57.183Z"},"containers":{"cna":{"title":"cifs: client: fix memory leak in smb3_fs_context_parse_param","descriptions":[{"lang":"en","value":"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 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"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"af1a3d2ba9543e99d78914d8fb88b61d0531d9a1","status":"affected","lessThan":"299bc05e1475a4aa1eb985ade8f39e68c1bba9b9","versionType":"git"},{"version":"af1a3d2ba9543e99d78914d8fb88b61d0531d9a1","status":"affected","lessThan":"868fc62811d3fabcf5685e14f36377a855d5412d","versionType":"git"},{"version":"af1a3d2ba9543e99d78914d8fb88b61d0531d9a1","status":"affected","lessThan":"48c17341577e25a22feb13d694374b61d974edbc","versionType":"git"},{"version":"af1a3d2ba9543e99d78914d8fb88b61d0531d9a1","status":"affected","lessThan":"4515743cc7a42e1d67468402a6420c195532a6fa","versionType":"git"},{"version":"af1a3d2ba9543e99d78914d8fb88b61d0531d9a1","status":"affected","lessThan":"e8c73eb7db0a498cd4b22d2819e6ab1a6f506bd6","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/client/fs_context.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.11","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.11","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.117","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.59","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.17.9","status":"unaffected","lessThanOrEqual":"6.17.*","versionType":"semver"},{"version":"6.18","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/client/fs_context.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/299bc05e1475a4aa1eb985ade8f39e68c1bba9b9"},{"url":"https://git.kernel.org/stable/c/868fc62811d3fabcf5685e14f36377a855d5412d"},{"url":"https://git.kernel.org/stable/c/48c17341577e25a22feb13d694374b61d974edbc"},{"url":"https://git.kernel.org/stable/c/4515743cc7a42e1d67468402a6420c195532a6fa"},{"url":"https://git.kernel.org/stable/c/e8c73eb7db0a498cd4b22d2819e6ab1a6f506bd6"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:22:57.829Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"6.6.117"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"6.12.59"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"6.17.9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"6.18"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}