fkie_cve-2021-47249
Vulnerability from fkie_nvd
Published
2024-05-21 15:15
Modified
2024-12-30 19:01
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: net: rds: fix memory leak in rds_recvmsg Syzbot reported memory leak in rds. The problem was in unputted refcount in case of error. int rds_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, int msg_flags) { ... if (!rds_next_incoming(rs, &inc)) { ... } After this "if" inc refcount incremented and if (rds_cmsg_recv(inc, msg, rs)) { ret = -EFAULT; goto out; } ... out: return ret; } in case of rds_cmsg_recv() fail the refcount won't be decremented. And it's easy to see from ftrace log, that rds_inc_addref() don't have rds_inc_put() pair in rds_recvmsg() after rds_cmsg_recv() 1) | rds_recvmsg() { 1) 3.721 us | rds_inc_addref(); 1) 3.853 us | rds_message_inc_copy_to_user(); 1) + 10.395 us | rds_cmsg_recv(); 1) + 34.260 us | }
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/06b7cb0194bd1ede0dd27f3a946e7c0279fba44aPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1f79bc8ae81c05eb112a53f981cb2c244ee50d02Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2038cd15eacdf7512755c27686822e0052eb9042Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/423c6939758fb3b9cf5abbd1e7792068a5c4ae8cPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/49bfcbfd989a8f1f23e705759a6bb099de2cff9fPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5946fbf48355f5a8caeff72580c7658da5966b86Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8c3ec88b03e9e4ca117dcdc4204fd3edcd02084fPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b25b60d076164edb3025e85aabd2cf50a5215b91Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/06b7cb0194bd1ede0dd27f3a946e7c0279fba44aPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/1f79bc8ae81c05eb112a53f981cb2c244ee50d02Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/2038cd15eacdf7512755c27686822e0052eb9042Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/423c6939758fb3b9cf5abbd1e7792068a5c4ae8cPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/49bfcbfd989a8f1f23e705759a6bb099de2cff9fPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/5946fbf48355f5a8caeff72580c7658da5966b86Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/8c3ec88b03e9e4ca117dcdc4204fd3edcd02084fPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/b25b60d076164edb3025e85aabd2cf50a5215b91Patch
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 *
linux linux_kernel 5.13
linux linux_kernel 5.13
linux linux_kernel 5.13
linux linux_kernel 5.13
linux linux_kernel 5.13
linux linux_kernel 5.13


To clipboard 

{
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: rds: fix memory leak in rds_recvmsg\n\nSyzbot reported memory leak in rds. The problem\nwas in unputted refcount in case of error.\n\nint rds_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,\n\t\tint msg_flags)\n{\n...\n\n\tif (!rds_next_incoming(rs, \u0026inc)) {\n\t\t...\n\t}\n\nAfter this \"if\" inc refcount incremented and\n\n\tif (rds_cmsg_recv(inc, msg, rs)) {\n\t\tret = -EFAULT;\n\t\tgoto out;\n\t}\n...\nout:\n\treturn ret;\n}\n\nin case of rds_cmsg_recv() fail the refcount won\u0027t be\ndecremented. And it\u0027s easy to see from ftrace log, that\nrds_inc_addref() don\u0027t have rds_inc_put() pair in\nrds_recvmsg() after rds_cmsg_recv()\n\n 1)               |  rds_recvmsg() {\n 1)   3.721 us    |    rds_inc_addref();\n 1)   3.853 us    |    rds_message_inc_copy_to_user();\n 1) + 10.395 us   |    rds_cmsg_recv();\n 1) + 34.260 us   |  }"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux se ha resuelto la siguiente vulnerabilidad: net:rds: corrige p\u00e9rdida de memoria en rds_recvmsg. Syzbot inform\u00f3 p\u00e9rdida de memoria en rds. El problema estaba en el recuento no puesto en caso de error. int rds_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, int msg_flags) { ... if (!rds_next_incoming(rs, \u0026amp;inc)) { ... } Despu\u00e9s de esto \"if\" inc refcount incrementado y if (rds_cmsg_recv (inc, mensaje, rs)) { ret = -EFAULT; salir; } ... fuera: devolver ret; } en caso de que rds_cmsg_recv() falle, el recuento no disminuir\u00e1. Y es f\u00e1cil ver en el registro de ftrace que rds_inc_addref() no tiene el par rds_inc_put() en rds_recvmsg() despu\u00e9s de rds_cmsg_recv() 1) | rds_recvmsg() { 1) 3.721 us| rds_inc_addref(); 1) 3.853 us| rds_message_inc_copy_to_user(); 1) + 10.395 us| rds_cmsg_recv(); 1) + 34.260 us| }"
    }
  ],
  "id": "CVE-2021-47249",
  "lastModified": "2024-12-30T19:01:43.417",
  "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"
      }
    ]
  },
  "published": "2024-05-21T15:15:13.857",
  "references": [
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
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          "lang": "en",
          "value": "CWE-401"
        }
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      "source": "nvd@nist.gov",
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  ]
}


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