CVE-2025-68219 (GCVE-0-2025-68219)

Vulnerability from cvelistv5 – Published: 2025-12-16 13:57 – Updated: 2026-10-30 12:23
VLAI
Title
cifs: fix memory leak in smb3_fs_context_parse_param error path
Summary
In the Linux kernel, the following vulnerability has been resolved: cifs: fix memory leak in smb3_fs_context_parse_param error path Add proper cleanup of ctx->source and fc->source to the cifs_parse_mount_err error handler. This ensures that memory allocated for the source strings is correctly freed on all error paths, matching the cleanup already performed in the success path by smb3_cleanup_fs_context_contents(). Pointers are also set to NULL after freeing to prevent potential double-free issues. This change fixes a memory leak originally detected by syzbot. The leak occurred when processing Opt_source mount options if an error happened after ctx->source and fc->source were successfully allocated but before the function completed. The specific leak sequence was: 1. ctx->source = smb3_fs_context_fullpath(ctx, '/') allocates memory 2. fc->source = kstrdup(ctx->source, GFP_KERNEL) allocates more memory 3. A subsequent error jumps to cifs_parse_mount_err 4. The old error handler freed passwords but not the source strings, causing the memory to leak. This issue was not addressed by commit e8c73eb7db0a ("cifs: client: fix memory leak in smb3_fs_context_parse_param"), which only fixed leaks from repeated fsconfig() calls but not this error path. Patch updated with minor change suggested by kernel test robot
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6637 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 24e0a1eff9e2b9835a6e7c17039dfb6ecfd81f1f , < a8071fd69df335362be5ecf5df5a167fd1eb5853 (git)
Affected: 24e0a1eff9e2b9835a6e7c17039dfb6ecfd81f1f , < 7627864dc3121f39e220f5253a227edf472de59e (git)
Affected: 24e0a1eff9e2b9835a6e7c17039dfb6ecfd81f1f , < 48d69290270891f988e72edddd9688c20515421d (git)
Affected: 24e0a1eff9e2b9835a6e7c17039dfb6ecfd81f1f , < 37010021d7e0341bb241ca00bcbae31f2c50b23f (git)
Affected: 24e0a1eff9e2b9835a6e7c17039dfb6ecfd81f1f , < 7e4d9120cfa413dd34f4f434befc5dbe6c38b2e5 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.11
Unaffected: 0 , < 5.11 (semver)
Unaffected: 6.1.191 , ≤ 6.1.* (semver)
Unaffected: 6.6.118 , ≤ 6.6.* (semver)
Unaffected: 6.12.60 , ≤ 6.12.* (semver)
Unaffected: 6.17.10 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: fix memory leak in smb3_fs_context_parse_param error path\n\nAdd proper cleanup of ctx-\u003esource and fc-\u003esource to the\ncifs_parse_mount_err error handler. This ensures that memory allocated\nfor the source strings is correctly freed on all error paths, matching\nthe cleanup already performed in the success path by\nsmb3_cleanup_fs_context_contents().\nPointers are also set to NULL after freeing to prevent potential\ndouble-free issues.\n\nThis change fixes a memory leak originally detected by syzbot. The\nleak occurred when processing Opt_source mount options if an error\nhappened after ctx-\u003esource and fc-\u003esource were successfully\nallocated but before the function completed.\n\nThe specific leak sequence was:\n1. ctx-\u003esource = smb3_fs_context_fullpath(ctx, \u0027/\u0027) allocates memory\n2. fc-\u003esource = kstrdup(ctx-\u003esource, GFP_KERNEL) allocates more memory\n3. A subsequent error jumps to cifs_parse_mount_err\n4. The old error handler freed passwords but not the source strings,\ncausing the memory to leak.\n\nThis issue was not addressed by commit e8c73eb7db0a (\"cifs: client:\nfix memory leak in smb3_fs_context_parse_param\"), which only fixed\nleaks from repeated fsconfig() calls but not this error path.\n\nPatch updated with minor change suggested by kernel test robot"
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/7e4d9120cfa413dd34f4f434befc5dbe6c38b2e5"
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    "datePublished": "2025-12-16T13:57:13.461Z",
    "dateReserved": "2025-12-16T13:41:40.256Z",
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      "source": "Microsoft CSAF VEX",
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      "title": "cifs: fix memory leak in smb3_fs_context_parse_param error path",
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: fix memory leak in smb3_fs_context_parse_param error path\n\nAdd proper cleanup of ctx-\u003esource and fc-\u003esource to the\ncifs_parse_mount_err error handler. This ensures that memory allocated\nfor the source strings is correctly freed on all error paths, matching\nthe cleanup already performed in the success path by\nsmb3_cleanup_fs_context_contents().\nPointers are also set to NULL after freeing to prevent potential\ndouble-free issues.\n\nThis change fixes a memory leak originally detected by syzbot. The\nleak occurred when processing Opt_source mount options if an error\nhappened after ctx-\u003esource and fc-\u003esource were successfully\nallocated but before the function completed.\n\nThe specific leak sequence was:\n1. ctx-\u003esource = smb3_fs_context_fullpath(ctx, \u0027/\u0027) allocates memory\n2. fc-\u003esource = kstrdup(ctx-\u003esource, GFP_KERNEL) allocates more memory\n3. A subsequent error jumps to cifs_parse_mount_err\n4. The old error handler freed passwords but not the source strings,\ncausing the memory to leak.\n\nThis issue was not addressed by commit e8c73eb7db0a (\"cifs: client:\nfix memory leak in smb3_fs_context_parse_param\"), which only fixed\nleaks from repeated fsconfig() calls but not this error path.\n\nPatch updated with minor change suggested by kernel test robot"
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ncifs: corrige una fuga de memoria en la ruta de error de smb3_fs_context_parse_param\n\nA\u00f1ade una limpieza adecuada de ctx -\u003e source y fc -\u003e source al gestor de errores cifs_parse_mount_err. Esto asegura que la memoria asignada para las cadenas de origen se libere correctamente en todas las rutas de error, coincidiendo con la limpieza ya realizada en la ruta de \u00e9xito por smb3_cleanup_fs_context_contents(). Los punteros tambi\u00e9n se establecen en NULL despu\u00e9s de liberar para evitar posibles problemas de doble liberaci\u00f3n.\n\nEste cambio corrige una fuga de memoria detectada originalmente por syzbot. La fuga ocurri\u00f3 al procesar opciones de montaje Opt_source si ocurr\u00eda un error despu\u00e9s de que ctx -\u003e source y fc -\u003e source fueran asignados con \u00e9xito pero antes de que la funci\u00f3n se completara.\n\nLa secuencia espec\u00edfica de la fuga fue:\n1. ctx -\u003e source = smb3_fs_context_fullpath(ctx, \u0027/\u0027) asigna memoria\n2. fc -\u003e source = kstrdup(ctx -\u003e source, GFP_KERNEL) asigna m\u00e1s memoria\n3. Un error subsiguiente salta a cifs_parse_mount_err\n4. El antiguo gestor de errores liberaba contrase\u00f1as pero no las cadenas de origen, causando la fuga de memoria.\n\nEste problema no fue abordado por el commit e8c73eb7db0a (\u0027cifs: cliente: corrige fuga de memoria en smb3_fs_context_parse_param\u0027), que solo correg\u00eda fugas de llamadas repetidas a fsconfig() pero no esta ruta de error.\n\nParche actualizado con un cambio menor sugerido por el robot de prueba del kernel"
          }
        ],
        "id": "CVE-2025-68219",
        "lastModified": "2026-10-30T13:18:19.167",
        "metrics": {},
        "published": "2025-12-16T14:15:55.013",
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      "cve": "CVE-2025-68219",
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      "product_status:known_affected": "232",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: cifs: fix memory leak in smb3_fs_context_parse_param error path",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-68219.json",
      "version": "3"
    }
  }
}



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