fkie_cve-2024-50036
Vulnerability from fkie_nvd
Published
2024-10-21 20:15
Modified
2025-11-03 23:16
Severity ?
7.0 (High) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: net: do not delay dst_entries_add() in dst_release() dst_entries_add() uses per-cpu data that might be freed at netns dismantle from ip6_route_net_exit() calling dst_entries_destroy() Before ip6_route_net_exit() can be called, we release all the dsts associated with this netns, via calls to dst_release(), which waits an rcu grace period before calling dst_destroy() dst_entries_add() use in dst_destroy() is racy, because dst_entries_destroy() could have been called already. Decrementing the number of dsts must happen sooner. Notes: 1) in CONFIG_XFRM case, dst_destroy() can call dst_release_immediate(child), this might also cause UAF if the child does not have DST_NOCOUNT set. IPSEC maintainers might take a look and see how to address this. 2) There is also discussion about removing this count of dst, which might happen in future kernels.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3c7c918ec0aa3555372c5a57f18780b7a96c5cfcPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/547087307bc19417b4f2bc85ba9664a3e8db5a6a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a60db84f772fc3a906c6c4072f9207579c41166f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ac888d58869bb99753e7652be19a151df9ecb35dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e3915f028b1f1c37e87542e5aadd33728c259d96
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/eae7435b48ffc8e9be0ff9cfeae40af479a609ddPatch
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html
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 6.12
linux linux_kernel 6.12


To clipboard 

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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: do not delay dst_entries_add() in dst_release()\n\ndst_entries_add() uses per-cpu data that might be freed at netns\ndismantle from ip6_route_net_exit() calling dst_entries_destroy()\n\nBefore ip6_route_net_exit() can be called, we release all\nthe dsts associated with this netns, via calls to dst_release(),\nwhich waits an rcu grace period before calling dst_destroy()\n\ndst_entries_add() use in dst_destroy() is racy, because\ndst_entries_destroy() could have been called already.\n\nDecrementing the number of dsts must happen sooner.\n\nNotes:\n\n1) in CONFIG_XFRM case, dst_destroy() can call\n   dst_release_immediate(child), this might also cause UAF\n   if the child does not have DST_NOCOUNT set.\n   IPSEC maintainers might take a look and see how to address this.\n\n2) There is also discussion about removing this count of dst,\n   which might happen in future kernels."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: no retrasar dst_entries_add() en dst_release() dst_entries_add() usa datos por CPU que podr\u00edan liberarse en el desmantelamiento de netns de ip6_route_net_exit() llamando a dst_entries_destroy() Antes de que se pueda llamar a ip6_route_net_exit(), liberamos todos los dst asociados con este netns, a trav\u00e9s de llamadas a dst_release(), que espera un per\u00edodo de gracia de rcu antes de llamar a dst_destroy() El uso de dst_entries_add() en dst_destroy() es arriesgado, porque dst_entries_destroy() ya podr\u00eda haberse llamado. La disminuci\u00f3n del n\u00famero de dst debe ocurrir antes. Notas: 1) en el caso de CONFIG_XFRM, dst_destroy() puede llamar a dst_release_immediate(child), lo que tambi\u00e9n podr\u00eda causar UAF si el hijo no tiene DST_NOCOUNT configurado. Los encargados del mantenimiento de IPSEC podr\u00edan echar un vistazo y ver c\u00f3mo solucionar esto. 2) Tambi\u00e9n se est\u00e1 discutiendo sobre la eliminaci\u00f3n de este recuento de dst, lo que podr\u00eda suceder en kernels futuros."
    }
  ],
  "id": "CVE-2024-50036",
  "lastModified": "2025-11-03T23:16:42.343",
  "metrics": {
    "cvssMetricV31": [
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        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.0,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.0,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
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  "published": "2024-10-21T20:15:16.717",
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      "tags": [
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
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          "lang": "en",
          "value": "NVD-CWE-noinfo"
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      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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