FKIE_CVE-2025-40306

Vulnerability from fkie_nvd - Published: 2025-12-08 01:16 - Updated: 2026-10-14 22:10
Severity
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: orangefs: fix xattr related buffer overflow... Willy Tarreau <w@1wt.eu> forwarded me a message from Disclosure <disclosure@aisle.com> with the following warning: > The helper `xattr_key()` uses the pointer variable in the loop condition > rather than dereferencing it. As `key` is incremented, it remains non-NULL > (until it runs into unmapped memory), so the loop does not terminate on > valid C strings and will walk memory indefinitely, consuming CPU or hanging > the thread. I easily reproduced this with setfattr and getfattr, causing a kernel oops, hung user processes and corrupted orangefs files. Disclosure sent along a diff (not a patch) with a suggested fix, which I based this patch on. After xattr_key started working right, xfstest generic/069 exposed an xattr related memory leak that lead to OOM. xattr_key returns a hashed key. When adding xattrs to the orangefs xattr cache, orangefs used hash_add, a kernel hashing macro. hash_add also hashes the key using hash_log which resulted in additions to the xattr cache going to the wrong hash bucket. generic/069 tortures a single file and orangefs does a getattr for the xattr "security.capability" every time. Orangefs negative caches on xattrs which includes a kmalloc. Since adds to the xattr cache were going to the wrong bucket, every getattr for "security.capability" resulted in another kmalloc, none of which were ever freed. I changed the two uses of hash_add to hlist_add_head instead and the memory leak ceased and generic/069 quit throwing furniture.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/025e880759c279ec64d0f754fe65bf45961da864
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/15afebb9597449c444801d1ff0b8d8b311f950ab
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9127d1e90c90e5960c8bc72a4ce2c209691a7021
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bc812574de633cf9a9ad6974490e45f6a4bb5126
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c2ca015ac109fd743fdde27933d59dc5ad46658e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c6564ff6b53c9a8dc786b6f1c51ae7688273f931
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e09a096104fc65859422817fb2211f35855983fe
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ef892d2bf4f3fa2c8de1677dd307e678bdd3d865
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/orangefs/xattr.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "c6564ff6b53c9a8dc786b6f1c51ae7688273f931",
              "status": "affected",
              "version": "f7ab093f74bf638ed98fd1115f3efa17e308bb7f",
              "versionType": "git"
            },
            {
              "lessThan": "ef892d2bf4f3fa2c8de1677dd307e678bdd3d865",
              "status": "affected",
              "version": "f7ab093f74bf638ed98fd1115f3efa17e308bb7f",
              "versionType": "git"
            },
            {
              "lessThan": "15afebb9597449c444801d1ff0b8d8b311f950ab",
              "status": "affected",
              "version": "f7ab093f74bf638ed98fd1115f3efa17e308bb7f",
              "versionType": "git"
            },
            {
              "lessThan": "bc812574de633cf9a9ad6974490e45f6a4bb5126",
              "status": "affected",
              "version": "f7ab093f74bf638ed98fd1115f3efa17e308bb7f",
              "versionType": "git"
            },
            {
              "lessThan": "e09a096104fc65859422817fb2211f35855983fe",
              "status": "affected",
              "version": "f7ab093f74bf638ed98fd1115f3efa17e308bb7f",
              "versionType": "git"
            },
            {
              "lessThan": "9127d1e90c90e5960c8bc72a4ce2c209691a7021",
              "status": "affected",
              "version": "f7ab093f74bf638ed98fd1115f3efa17e308bb7f",
              "versionType": "git"
            },
            {
              "lessThan": "c2ca015ac109fd743fdde27933d59dc5ad46658e",
              "status": "affected",
              "version": "f7ab093f74bf638ed98fd1115f3efa17e308bb7f",
              "versionType": "git"
            },
            {
              "lessThan": "025e880759c279ec64d0f754fe65bf45961da864",
              "status": "affected",
              "version": "f7ab093f74bf638ed98fd1115f3efa17e308bb7f",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/orangefs/xattr.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.6"
            },
            {
              "lessThan": "4.6",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.302",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.247",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.197",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.159",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.117",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.58",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.8",
              "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\norangefs: fix xattr related buffer overflow...\n\nWilly Tarreau \u003cw@1wt.eu\u003e forwarded me a message from\nDisclosure \u003cdisclosure@aisle.com\u003e with the following\nwarning:\n\n\u003e The helper `xattr_key()` uses the pointer variable in the loop condition\n\u003e rather than dereferencing it. As `key` is incremented, it remains non-NULL\n\u003e (until it runs into unmapped memory), so the loop does not terminate on\n\u003e valid C strings and will walk memory indefinitely, consuming CPU or hanging\n\u003e the thread.\n\nI easily reproduced this with setfattr and getfattr, causing a kernel\noops, hung user processes and corrupted orangefs files. Disclosure\nsent along a diff (not a patch) with a suggested fix, which I based\nthis patch on.\n\nAfter xattr_key started working right, xfstest generic/069 exposed an\nxattr related memory leak that lead to OOM. xattr_key returns\na hashed key.  When adding xattrs to the orangefs xattr cache, orangefs\nused hash_add, a kernel hashing macro. hash_add also hashes the key using\nhash_log which resulted in additions to the xattr cache going to the wrong\nhash bucket. generic/069 tortures a single file and orangefs does a\ngetattr for the xattr \"security.capability\" every time. Orangefs\nnegative caches on xattrs which includes a kmalloc. Since adds to the\nxattr cache were going to the wrong bucket, every getattr for\n\"security.capability\" resulted in another kmalloc, none of which were\never freed.\n\nI changed the two uses of hash_add to hlist_add_head instead\nand the memory leak ceased and generic/069 quit throwing furniture."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\norangefs: corregir desbordamiento de b\u00fafer relacionado con xattr...\n\nWilly Tarreau \u003cw@1wt.eu\u003e me reenvi\u00f3 un mensaje de\nDisclosure \u003cdisclosure@aisle.com\u003e con la siguiente\nadvertencia:\n\n\u003e El ayudante \u0027xattr_key()\u0027 usa la variable de puntero en la condici\u00f3n del bucle en lugar de desreferenciarla. A medida que \u0027key\u0027 se incrementa, permanece no nulo (hasta que encuentra memoria no mapeada), por lo que el bucle no termina en cadenas C v\u00e1lidas y recorrer\u00e1 la memoria indefinidamente, consumiendo CPU o colgando el hilo.\n\nReproduje esto f\u00e1cilmente con setfattr y getfattr, causando un oops del kernel, procesos de usuario colgados y archivos orangefs corruptos. Disclosure envi\u00f3 un diff (no un parche) con una soluci\u00f3n sugerida, en la que bas\u00e9 este parche.\n\nDespu\u00e9s de que xattr_key empez\u00f3 a funcionar correctamente, xfstest generic/069 expuso una fuga de memoria relacionada con xattr que llev\u00f3 a OOM. xattr_key devuelve una clave hash. Al a\u00f1adir xattrs a la cach\u00e9 de xattr de orangefs, orangefs us\u00f3 hash_add, una macro de hashing del kernel. hash_add tambi\u00e9n aplica hash a la clave usando hash_log, lo que result\u00f3 en que las adiciones a la cach\u00e9 de xattr fueran al cubo hash incorrecto. generic/069 tortura un solo archivo y orangefs hace un getattr para el xattr \u0027security.capability\u0027 cada vez. Orangefs hace cach\u00e9 negativa en xattrs, lo que incluye un kmalloc. Dado que las adiciones a la cach\u00e9 de xattr iban al cubo incorrecto, cada getattr para \u0027security.capability\u0027 result\u00f3 en otro kmalloc, ninguno de los cuales fue liberado jam\u00e1s.\n\nCambi\u00e9 los dos usos de hash_add a hlist_add_head en su lugar y la fuga de memoria ces\u00f3 y generic/069 dej\u00f3 de tirar muebles."
    }
  ],
  "id": "CVE-2025-40306",
  "lastModified": "2026-10-14T22:10:00.210",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2025-12-08T01:16:02.820",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/025e880759c279ec64d0f754fe65bf45961da864"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/15afebb9597449c444801d1ff0b8d8b311f950ab"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/9127d1e90c90e5960c8bc72a4ce2c209691a7021"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/bc812574de633cf9a9ad6974490e45f6a4bb5126"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c2ca015ac109fd743fdde27933d59dc5ad46658e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c6564ff6b53c9a8dc786b6f1c51ae7688273f931"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e09a096104fc65859422817fb2211f35855983fe"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ef892d2bf4f3fa2c8de1677dd307e678bdd3d865"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Deferred"
}



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