fkie_cve-2024-26689
Vulnerability from fkie_nvd
Published
2024-04-03 15:15
Modified
2025-01-14 17:26
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: ceph: prevent use-after-free in encode_cap_msg() In fs/ceph/caps.c, in encode_cap_msg(), "use after free" error was caught by KASAN at this line - 'ceph_buffer_get(arg->xattr_buf);'. This implies before the refcount could be increment here, it was freed. In same file, in "handle_cap_grant()" refcount is decremented by this line - 'ceph_buffer_put(ci->i_xattrs.blob);'. It appears that a race occurred and resource was freed by the latter line before the former line could increment it. encode_cap_msg() is called by __send_cap() and __send_cap() is called by ceph_check_caps() after calling __prep_cap(). __prep_cap() is where arg->xattr_buf is assigned to ci->i_xattrs.blob. This is the spot where the refcount must be increased to prevent "use after free" error.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/70e329b440762390258a6fe8c0de93c9fdd56c77Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7958c1bf5b03c6f1f58e724dbdec93f8f60b96fcPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8180d0c27b93a6eb60da1b08ea079e3926328214Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ae20db45e482303a20e56f2db667a9d9c54ac7e7Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cda4672da1c26835dcbd7aec2bfed954eda9b5efPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f3f98d7d84b31828004545e29fd7262b9f444139Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/70e329b440762390258a6fe8c0de93c9fdd56c77Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/7958c1bf5b03c6f1f58e724dbdec93f8f60b96fcPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/8180d0c27b93a6eb60da1b08ea079e3926328214Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/ae20db45e482303a20e56f2db667a9d9c54ac7e7Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/cda4672da1c26835dcbd7aec2bfed954eda9b5efPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/f3f98d7d84b31828004545e29fd7262b9f444139Patch
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2024/06/msg00017.htmlMailing List
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 6.8
linux linux_kernel 6.8
linux linux_kernel 6.8
debian debian_linux 10.0


To clipboard 

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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nceph: prevent use-after-free in encode_cap_msg()\n\nIn fs/ceph/caps.c, in encode_cap_msg(), \"use after free\" error was\ncaught by KASAN at this line - \u0027ceph_buffer_get(arg-\u003exattr_buf);\u0027. This\nimplies before the refcount could be increment here, it was freed.\n\nIn same file, in \"handle_cap_grant()\" refcount is decremented by this\nline - \u0027ceph_buffer_put(ci-\u003ei_xattrs.blob);\u0027. It appears that a race\noccurred and resource was freed by the latter line before the former\nline could increment it.\n\nencode_cap_msg() is called by __send_cap() and __send_cap() is called by\nceph_check_caps() after calling __prep_cap(). __prep_cap() is where\narg-\u003exattr_buf is assigned to ci-\u003ei_xattrs.blob. This is the spot where\nthe refcount must be increased to prevent \"use after free\" error."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ceph: evita el use-after-free en encode_cap_msg() En fs/ceph/caps.c, en encode_cap_msg(), KASAN detect\u00f3 el error \"use after free\" en este l\u00ednea - \u0027ceph_buffer_get(arg-\u0026gt;xattr_buf);\u0027. Esto implica que antes de que el recuento pudiera incrementarse aqu\u00ed, fue liberado. En el mismo archivo, en \"handle_cap_grant()\", el refcount se reduce en esta l\u00ednea: \u0027ceph_buffer_put(ci-\u0026gt;i_xattrs.blob);\u0027. Parece que se produjo una ejecuci\u00f3n y la \u00faltima l\u00ednea liber\u00f3 el recurso antes de que la primera l\u00ednea pudiera incrementarlo. __send_cap() llama a encode_cap_msg() y ceph_check_caps() llama a __send_cap() despu\u00e9s de llamar a __prep_cap(). __prep_cap() es donde arg-\u0026gt;xattr_buf se asigna a ci-\u0026gt;i_xattrs.blob. Este es el punto donde se debe aumentar el recuento para evitar el error \"use after free\"."
    }
  ],
  "id": "CVE-2024-26689",
  "lastModified": "2025-01-14T17:26:26.393",
  "metrics": {
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          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
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          "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"
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        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
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  "published": "2024-04-03T15:15:52.427",
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          "lang": "en",
          "value": "CWE-416"
        }
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      "source": "nvd@nist.gov",
      "type": "Primary"
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}


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