FKIE_CVE-2025-40268

Vulnerability from fkie_nvd - Published: 2025-12-06 22:15 - Updated: 2026-10-30 13:18
Severity
Summary
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
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/299bc05e1475a4aa1eb985ade8f39e68c1bba9b9
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4515743cc7a42e1d67468402a6420c195532a6fa
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/48c17341577e25a22feb13d694374b61d974edbc
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/868fc62811d3fabcf5685e14f36377a855d5412d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e8c73eb7db0a498cd4b22d2819e6ab1a6f506bd6
Impacted products
Vendor Product Version
To clipboard 

{
  "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-\u003esource for the second fsconfig, not the first.\nRegarding fc-\u003esource, 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?\u0027smb3_fs_context_parse_param\u0027\n\nEl usuario llama a fsconfig dos veces, pero cuando el programa finaliza,?\u0027free()\u0027 solo libera \u0027ctx -\u003e source\u0027 para el segundo?fsconfig, no para el primero. En cuanto a \u0027fc -\u003e source\u0027, 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?\u0027ctx\u0027 o a?\u0027fc\u0027 antes de cada an\u00e1lisis.\n\nsyzbot inform\u00f3:\n\u0027\u0027\u0027\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\u0027\u0027\u0027"
    }
  ],
  "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"
}



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