fkie_cve-2022-49890
Vulnerability from fkie_nvd
Published
2025-05-01 15:16
Modified
2025-05-07 13:19
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: capabilities: fix potential memleak on error path from vfs_getxattr_alloc() In cap_inode_getsecurity(), we will use vfs_getxattr_alloc() to complete the memory allocation of tmpbuf, if we have completed the memory allocation of tmpbuf, but failed to call handler->get(...), there will be a memleak in below logic: |-- ret = (int)vfs_getxattr_alloc(mnt_userns, ...) | /* ^^^ alloc for tmpbuf */ |-- value = krealloc(*xattr_value, error + 1, flags) | /* ^^^ alloc memory */ |-- error = handler->get(handler, ...) | /* error! */ |-- *xattr_value = value | /* xattr_value is &tmpbuf (memory leak!) */ So we will try to free(tmpbuf) after vfs_getxattr_alloc() fails to fix it. [PM: subject line and backtrace tweaks]
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0c3e6288da650d1ec911a259c77bc2d88e498603Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2de8eec8afb75792440b8900a01d52b8f6742fd1Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6bb00eb21c0fbf18e5d3538c9ff0cf63fd0ace85Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7480aeff0093d8c54377553ec6b31110bea37b4dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8cf0a1bc12870d148ae830a4ba88cfdf0e879ceePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/90577bcc01c4188416a47269f8433f70502abe98Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cdf01c807e974048c43c7fd3ca574f6086a57906Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 6.1
linux linux_kernel 6.1
linux linux_kernel 6.1


To clipboard 

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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncapabilities: fix potential memleak on error path from vfs_getxattr_alloc()\n\nIn cap_inode_getsecurity(), we will use vfs_getxattr_alloc() to\ncomplete the memory allocation of tmpbuf, if we have completed\nthe memory allocation of tmpbuf, but failed to call handler-\u003eget(...),\nthere will be a memleak in below logic:\n\n  |-- ret = (int)vfs_getxattr_alloc(mnt_userns, ...)\n    |           /* ^^^ alloc for tmpbuf */\n    |-- value = krealloc(*xattr_value, error + 1, flags)\n    |           /* ^^^ alloc memory */\n    |-- error = handler-\u003eget(handler, ...)\n    |           /* error! */\n    |-- *xattr_value = value\n    |           /* xattr_value is \u0026tmpbuf (memory leak!) */\n\nSo we will try to free(tmpbuf) after vfs_getxattr_alloc() fails to fix it.\n\n[PM: subject line and backtrace tweaks]"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: capacidades: reparar posible fuga de memoria en la ruta de error de vfs_getxattr_alloc() En cap_inode_getsecurity(), utilizaremos vfs_getxattr_alloc() para completar la asignaci\u00f3n de memoria de tmpbuf, si hemos completado la asignaci\u00f3n de memoria de tmpbuf, pero no pudimos llamar a handler-\u0026gt;get(...), habr\u00e1 una fuga de memoria en la siguiente l\u00f3gica: |-- ret = (int)vfs_getxattr_alloc(mnt_userns, ...) | /* ^^^ asignar para tmpbuf */ |-- valor = krealloc(*xattr_value, error + 1, flags) | /* ^^^ asignar memoria */ |-- error = handler-\u0026gt;get(handler, ...) | /* \u00a1error! */ |-- *xattr_value = valor | /* xattr_value es \u0026amp;tmpbuf (\u00a1p\u00e9rdida de memoria!) */ Intentaremos liberar (tmpbuf) despu\u00e9s de que vfs_getxattr_alloc() no pueda solucionarlo. [MP: l\u00ednea de asunto y ajustes de backtrace]"
    }
  ],
  "id": "CVE-2022-49890",
  "lastModified": "2025-05-07T13:19:54.100",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2025-05-01T15:16:14.000",
  "references": [
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
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          "lang": "en",
          "value": "CWE-401"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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