FKIE_CVE-2024-50130

Vulnerability from fkie_nvd - Published: 2024-11-05 18:15 - Updated: 2025-03-06 17:15
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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: netfilter: bpf: must hold reference on net namespace BUG: KASAN: slab-use-after-free in __nf_unregister_net_hook+0x640/0x6b0 Read of size 8 at addr ffff8880106fe400 by task repro/72= bpf_nf_link_release+0xda/0x1e0 bpf_link_free+0x139/0x2d0 bpf_link_release+0x68/0x80 __fput+0x414/0xb60 Eric says: It seems that bpf was able to defer the __nf_unregister_net_hook() after exit()/close() time. Perhaps a netns reference is missing, because the netns has been dismantled/freed already. bpf_nf_link_attach() does : link->net = net; But I do not see a reference being taken on net. Add such a reference and release it after hook unreg. Note that I was unable to get syzbot reproducer to work, so I do not know if this resolves this splat.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1230fe7ad3974f7bf6c78901473e039b34d4fb1fPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d0d7939543a1b3bb93af9a18d258a774daf8f162Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f41bd93b3e0508edc7ba820357f949071dcc0accPatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 6.12
linux linux_kernel 6.12
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\nnetfilter: bpf: must hold reference on net namespace\n\nBUG: KASAN: slab-use-after-free in __nf_unregister_net_hook+0x640/0x6b0\nRead of size 8 at addr ffff8880106fe400 by task repro/72=\nbpf_nf_link_release+0xda/0x1e0\nbpf_link_free+0x139/0x2d0\nbpf_link_release+0x68/0x80\n__fput+0x414/0xb60\n\nEric says:\n It seems that bpf was able to defer the __nf_unregister_net_hook()\n after exit()/close() time.\n Perhaps a netns reference is missing, because the netns has been\n dismantled/freed already.\n bpf_nf_link_attach() does :\n link-\u003enet = net;\n But I do not see a reference being taken on net.\n\nAdd such a reference and release it after hook unreg.\nNote that I was unable to get syzbot reproducer to work, so I\ndo not know if this resolves this splat."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: netfilter: bpf: debe contener referencia en el espacio de nombres net ERROR: KASAN: slab-use-after-free en __nf_unregister_net_hook+0x640/0x6b0 Lectura de tama\u00f1o 8 en la direcci\u00f3n ffff8880106fe400 por la tarea repro/72= bpf_nf_link_release+0xda/0x1e0 bpf_link_free+0x139/0x2d0 bpf_link_release+0x68/0x80 __fput+0x414/0xb60 Eric dice: Parece que bpf pudo diferir __nf_unregister_net_hook() despu\u00e9s del tiempo de exit()/close(). Quiz\u00e1s falta una referencia a netns, porque netns ya se ha desmantelado/liberado. bpf_nf_link_attach() hace: link-\u0026gt;net = net; Pero no veo que se tome ninguna referencia en net. Agregue dicha referencia y lib\u00e9rela despu\u00e9s de anular el registro. Tenga en cuenta que no pude hacer que funcionara el reproductor syzbot, por lo que no s\u00e9 si esto resuelve este problema."
    }
  ],
  "id": "CVE-2024-50130",
  "lastModified": "2025-03-06T17:15:18.953",
  "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"
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        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
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  "published": "2024-11-05T18:15:15.850",
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  "vulnStatus": "Modified",
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      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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}


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