CVE-2025-40268

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2025-40268", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T07:20:57.183Z", "datePublished": "2025-12-06T21:50:48.917Z", "dateUpdated": "2026-10-30T12:22:57.829Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:22:57.829Z"}, "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": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/smb/client/fs_context.c"], "versions": [{"version": "af1a3d2ba9543e99d78914d8fb88b61d0531d9a1", "lessThan": "299bc05e1475a4aa1eb985ade8f39e68c1bba9b9", "status": "affected", "versionType": "git"}, {"version": "af1a3d2ba9543e99d78914d8fb88b61d0531d9a1", "lessThan": "868fc62811d3fabcf5685e14f36377a855d5412d", "status": "affected", "versionType": "git"}, {"version": "af1a3d2ba9543e99d78914d8fb88b61d0531d9a1", "lessThan": "48c17341577e25a22feb13d694374b61d974edbc", "status": "affected", "versionType": "git"}, {"version": "af1a3d2ba9543e99d78914d8fb88b61d0531d9a1", "lessThan": "4515743cc7a42e1d67468402a6420c195532a6fa", "status": "affected", "versionType": "git"}, {"version": "af1a3d2ba9543e99d78914d8fb88b61d0531d9a1", "lessThan": "e8c73eb7db0a498cd4b22d2819e6ab1a6f506bd6", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/smb/client/fs_context.c"], "versions": [{"version": "5.11", "status": "affected"}, {"version": "0", "lessThan": "5.11", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.191", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.117", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.59", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.17.9", "lessThanOrEqual": "6.17.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "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"}]}]}], "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"}], "title": "cifs: client: fix memory leak in smb3_fs_context_parse_param", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/smb/client/fs_context.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "299bc05e1475a4aa1eb985ade8f39e68c1bba9b9", "status": "affected", "version": "af1a3d2ba9543e99d78914d8fb88b61d0531d9a1", "versionType": "git"}, {"lessThan": "868fc62811d3fabcf5685e14f36377a855d5412d", "status": "affected", "version": "af1a3d2ba9543e99d78914d8fb88b61d0531d9a1", "versionType": "git"}, {"lessThan": "48c17341577e25a22feb13d694374b61d974edbc", "status": "affected", "version": "af1a3d2ba9543e99d78914d8fb88b61d0531d9a1", "versionType": "git"}, {"lessThan": "4515743cc7a42e1d67468402a6420c195532a6fa", "status": "affected", "version": "af1a3d2ba9543e99d78914d8fb88b61d0531d9a1", "versionType": "git"}, {"lessThan": "e8c73eb7db0a498cd4b22d2819e6ab1a6f506bd6", "status": "affected", "version": "af1a3d2ba9543e99d78914d8fb88b61d0531d9a1", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/smb/client/fs_context.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.11"}, {"lessThan": "5.11", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.191", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.117", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.59", "versionType": "semver"}, {"lessThanOrEqual": "6.17.*", "status": "unaffected", "version": "6.17.9", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.18", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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"}, {"lang": "es", "value": "En el kernel de Linux, se ha corregido la siguiente vulnerabilidad:\n\ncifs: cliente: corregir fuga de memoria en?'smb3_fs_context_parse_param'\n\nEl usuario llama a fsconfig dos veces, pero cuando el programa finaliza,?'free()' solo libera 'ctx -> source' para el segundo?fsconfig, no para el primero. En cuanto a 'fc -> source', no existe c\u00f3digo en el contexto de fs relacionado con la reclamaci\u00f3n de su memoria.\n\nPara corregir esta fuga de memoria, libere la memoria?source correspondiente a?'ctx' o a?'fc' antes de cada an\u00e1lisis.\n\nsyzbot inform\u00f3:\n'''\nBUG: fuga de memoria\nobjeto sin referencias 0xffff888128afa360 (tama\u00f1o 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: fuga de memoria\nobjeto sin referencias 0xffff888112c7d900 (tama\u00f1o 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'''"}], "id": "CVE-2025-40268", "lastModified": "2026-10-30T13:18:14.560", "metrics": {}, "published": "2025-12-06T22:15:54.327", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/299bc05e1475a4aa1eb985ade8f39e68c1bba9b9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4515743cc7a42e1d67468402a6420c195532a6fa"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/48c17341577e25a22feb13d694374b61d974edbc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/868fc62811d3fabcf5685e14f36377a855d5412d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e8c73eb7db0a498cd4b22d2819e6ab1a6f506bd6"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Deferred"}

{"bugzilla": {"description": "kernel: cifs: client: fix memory leak in smb3_fs_context_parse_param", "id": "2419940", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2419940"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\ncifs: client: fix memory leak in smb3_fs_context_parse_param\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.\nTo fix this memory leak, release the source memory corresponding to ctx\nor fc before each parsing.\nsyzbot reported:\nBUG: memory leak\nunreferenced object 0xffff888128afa360 (size 96):\nbacktrace (crc 79c9c7ba):\nkstrdup+0x3c/0x80 mm/util.c:84\nsmb3_fs_context_parse_param+0x229b/0x36c0 fs/smb/client/fs_context.c:1444\nBUG: memory leak\nunreferenced object 0xffff888112c7d900 (size 96):\nbacktrace (crc 79c9c7ba):\nsmb3_fs_context_fullpath+0x70/0x1b0 fs/smb/client/fs_context.c:629\nsmb3_fs_context_parse_param+0x2266/0x36c0 fs/smb/client/fs_context.c:1438"], "name": "CVE-2025-40268", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-12-06T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-40268\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-40268\nhttps://lore.kernel.org/linux-cve-announce/2025120715-CVE-2025-40268-390a@gregkh/T"], "threat_severity": "Low"}

{}