CVE-2025-40268
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: cifs: client: fix memory leak in smb3_fs_context_parse_param The user calls fsconfig twice, but when the program exits, free() only frees ctx->source for the second fsconfig, not the first. Regarding fc->source, there is no code in the fs context related to its memory reclamation. To fix this memory leak, release the source memory corresponding to ctx or fc before each parsing. syzbot reported: BUG: memory leak unreferenced object 0xffff888128afa360 (size 96): backtrace (crc 79c9c7ba): kstrdup+0x3c/0x80 mm/util.c:84 smb3_fs_context_parse_param+0x229b/0x36c0 fs/smb/client/fs_context.c:1444 BUG: memory leak unreferenced object 0xffff888112c7d900 (size 96): backtrace (crc 79c9c7ba): smb3_fs_context_fullpath+0x70/0x1b0 fs/smb/client/fs_context.c:629 smb3_fs_context_parse_param+0x2266/0x36c0 fs/smb/client/fs_context.c:1438
Severity
Not scored
CVSS score
Not available
Vulnerability status
Deferred
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-12-06 22:15:54.327000
Last modified
2026-10-30 13:18:14.560000
View original CVE JSON
{
"id": "CVE-2025-40268",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2025-12-06T22:15:54.327",
"lastModified": "2026-10-30T13:18:14.560",
"vulnStatus": "Deferred",
"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 código en el contexto de fs relacionado con la reclamación de su memoria.\n\nPara corregir esta fuga de memoria, libere la memoria?source correspondiente a?'ctx' o a?'fc' antes de cada análisis.\n\nsyzbot informó:\n'''\nBUG: fuga de memoria\nobjeto sin referencias 0xffff888128afa360 (tamaño 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 (tamaño 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'''"
}
],
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"fs/smb/client/fs_context.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "af1a3d2ba9543e99d78914d8fb88b61d0531d9a1",
"lessThan": "299bc05e1475a4aa1eb985ade8f39e68c1bba9b9",
"versionType": "git",
"status": "affected"
},
{
"version": "af1a3d2ba9543e99d78914d8fb88b61d0531d9a1",
"lessThan": "868fc62811d3fabcf5685e14f36377a855d5412d",
"versionType": "git",
"status": "affected"
},
{
"version": "af1a3d2ba9543e99d78914d8fb88b61d0531d9a1",
"lessThan": "48c17341577e25a22feb13d694374b61d974edbc",
"versionType": "git",
"status": "affected"
},
{
"version": "af1a3d2ba9543e99d78914d8fb88b61d0531d9a1",
"lessThan": "4515743cc7a42e1d67468402a6420c195532a6fa",
"versionType": "git",
"status": "affected"
},
{
"version": "af1a3d2ba9543e99d78914d8fb88b61d0531d9a1",
"lessThan": "e8c73eb7db0a498cd4b22d2819e6ab1a6f506bd6",
"versionType": "git",
"status": "affected"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"programFiles": [
"fs/smb/client/fs_context.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "5.11",
"status": "affected"
},
{
"version": "0",
"lessThan": "5.11",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.1.191",
"lessThanOrEqual": "6.1.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.6.117",
"lessThanOrEqual": "6.6.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.12.59",
"lessThanOrEqual": "6.12.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.17.9",
"lessThanOrEqual": "6.17.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.18",
"lessThanOrEqual": "*",
"versionType": "original_commit_for_fix",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {},
"references": [
{
"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",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
]
}