fkie_cve-2024-50036
Vulnerability from fkie_nvd
Published
2024-10-21 20:15
Modified
2024-11-17 15:15
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
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 

{
   configurations: [
      {
         nodes: [
            {
               cpeMatch: [
                  {
                     criteria: "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                     matchCriteriaId: "EB008871-978A-402A-8407-15291079DC44",
                     versionEndExcluding: "3.11",
                     versionStartIncluding: "3.10.50",
                     vulnerable: true,
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               negate: false,
               operator: "OR",
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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 podrían 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 través de llamadas a dst_release(), que espera un período 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 podría haberse llamado. La disminución del número de dst debe ocurrir antes. Notas: 1) en el caso de CONFIG_XFRM, dst_destroy() puede llamar a dst_release_immediate(child), lo que también podría causar UAF si el hijo no tiene DST_NOCOUNT configurado. Los encargados del mantenimiento de IPSEC podrían echar un vistazo y ver cómo solucionar esto. 2) También se está discutiendo sobre la eliminación de este recuento de dst, lo que podría suceder en kernels futuros.",
      },
   ],
   id: "CVE-2024-50036",
   lastModified: "2024-11-17T15:15:18.893",
   metrics: {
      cvssMetricV31: [
         {
            cvssData: {
               attackComplexity: "HIGH",
               attackVector: "LOCAL",
               availabilityImpact: "HIGH",
               baseScore: 7,
               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,
            impactScore: 5.9,
            source: "nvd@nist.gov",
            type: "Primary",
         },
      ],
   },
   published: "2024-10-21T20:15:16.717",
   references: [
      {
         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
         tags: [
            "Patch",
         ],
         url: "https://git.kernel.org/stable/c/3c7c918ec0aa3555372c5a57f18780b7a96c5cfc",
      },
      {
         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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      },
      {
         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
         url: "https://git.kernel.org/stable/c/a60db84f772fc3a906c6c4072f9207579c41166f",
      },
      {
         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
         tags: [
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      },
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         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
         tags: [
            "Patch",
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         url: "https://git.kernel.org/stable/c/eae7435b48ffc8e9be0ff9cfeae40af479a609dd",
      },
   ],
   sourceIdentifier: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
   vulnStatus: "Modified",
   weaknesses: [
      {
         description: [
            {
               lang: "en",
               value: "NVD-CWE-noinfo",
            },
         ],
         source: "nvd@nist.gov",
         type: "Primary",
      },
   ],
}


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