FKIE_CVE-2024-36489

Vulnerability from fkie_nvd - Published: 2024-06-21 11:15 - Updated: 2024-11-21 09:22
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: tls: fix missing memory barrier in tls_init In tls_init(), a write memory barrier is missing, and store-store reordering may cause NULL dereference in tls_{setsockopt,getsockopt}. CPU0 CPU1 ----- ----- // In tls_init() // In tls_ctx_create() ctx = kzalloc() ctx->sk_proto = READ_ONCE(sk->sk_prot) -(1) // In update_sk_prot() WRITE_ONCE(sk->sk_prot, tls_prots) -(2) // In sock_common_setsockopt() READ_ONCE(sk->sk_prot)->setsockopt() // In tls_{setsockopt,getsockopt}() ctx->sk_proto->setsockopt() -(3) In the above scenario, when (1) and (2) are reordered, (3) can observe the NULL value of ctx->sk_proto, causing NULL dereference. To fix it, we rely on rcu_assign_pointer() which implies the release barrier semantic. By moving rcu_assign_pointer() after ctx->sk_proto is initialized, we can ensure that ctx->sk_proto are visible when changing sk->sk_prot.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2c260a24cf1c4d30ea3646124f766ee46169280bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/335c8f1566d8e44c384d16b450a18554896d4e8bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/91e61dd7a0af660408e87372d8330ceb218be302Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ab67c2fd3d070a21914d0c31319d3858ab4e199cPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d72e126e9a36d3d33889829df8fc90100bb0e071Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ef21007a7b581c7fe64d5a10c320880a033c837bPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/2c260a24cf1c4d30ea3646124f766ee46169280bPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/335c8f1566d8e44c384d16b450a18554896d4e8bPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/91e61dd7a0af660408e87372d8330ceb218be302Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/ab67c2fd3d070a21914d0c31319d3858ab4e199cPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/d72e126e9a36d3d33889829df8fc90100bb0e071Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/ef21007a7b581c7fe64d5a10c320880a033c837bPatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
To clipboard 

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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntls: fix missing memory barrier in tls_init\n\nIn tls_init(), a write memory barrier is missing, and store-store\nreordering may cause NULL dereference in tls_{setsockopt,getsockopt}.\n\nCPU0                               CPU1\n-----                              -----\n// In tls_init()\n// In tls_ctx_create()\nctx = kzalloc()\nctx-\u003esk_proto = READ_ONCE(sk-\u003esk_prot) -(1)\n\n// In update_sk_prot()\nWRITE_ONCE(sk-\u003esk_prot, tls_prots)     -(2)\n\n                                   // In sock_common_setsockopt()\n                                   READ_ONCE(sk-\u003esk_prot)-\u003esetsockopt()\n\n                                   // In tls_{setsockopt,getsockopt}()\n                                   ctx-\u003esk_proto-\u003esetsockopt()    -(3)\n\nIn the above scenario, when (1) and (2) are reordered, (3) can observe\nthe NULL value of ctx-\u003esk_proto, causing NULL dereference.\n\nTo fix it, we rely on rcu_assign_pointer() which implies the release\nbarrier semantic. By moving rcu_assign_pointer() after ctx-\u003esk_proto is\ninitialized, we can ensure that ctx-\u003esk_proto are visible when\nchanging sk-\u003esk_prot."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: tls: corrige la barrera de memoria faltante en tls_init En tls_init(), falta una barrera de memoria de escritura y el reordenamiento tienda-tienda puede causar una desreferencia NULL en tls_{setsockopt,getsockopt}. CPU0 CPU1 ----- ----- // En tls_init() // En tls_ctx_create() ctx = kzalloc() ctx-\u0026gt;sk_proto = READ_ONCE(sk-\u0026gt;sk_prot) -(1) // En update_sk_prot( ) WRITE_ONCE(sk-\u0026gt;sk_prot, tls_prots) -(2) // En sock_common_setsockopt() READ_ONCE(sk-\u0026gt;sk_prot)-\u0026gt;setsockopt() // En tls_{setsockopt,getsockopt}() ctx-\u0026gt;sk_proto-\u0026gt;setsockopt () -(3) En el escenario anterior, cuando (1) y (2) se reordenan, (3) puede observar el valor NULL de ctx-\u0026gt;sk_proto, lo que provoca la desreferencia NULL. Para solucionarlo, confiamos en rcu_assign_pointer() que implica la sem\u00e1ntica de barrera de liberaci\u00f3n. Al mover rcu_assign_pointer() despu\u00e9s de inicializar ctx-\u0026gt;sk_proto, podemos asegurarnos de que ctx-\u0026gt;sk_proto sean visibles al cambiar sk-\u0026gt;sk_prot."
    }
  ],
  "id": "CVE-2024-36489",
  "lastModified": "2024-11-21T09:22:16.667",
  "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"
      }
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  "published": "2024-06-21T11:15:10.513",
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
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          "lang": "en",
          "value": "CWE-476"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
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  ]
}


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