GHSA-PRQ2-QJ2R-JCGV

Vulnerability from github – Published: 2024-05-21 15:31 – Updated: 2024-12-30 21:30
VLAI
Details

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 | }

Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Show details on source website
To clipboard 

{
  "affected": [],
  "aliases": [
    "CVE-2021-47249"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-401"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-05-21T15:15:13Z",
    "severity": "MODERATE"
  },
  "details": "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   |  }",
  "id": "GHSA-prq2-qj2r-jcgv",
  "modified": "2024-12-30T21:30:46Z",
  "published": "2024-05-21T15:31:40Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47249"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/06b7cb0194bd1ede0dd27f3a946e7c0279fba44a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1f79bc8ae81c05eb112a53f981cb2c244ee50d02"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2038cd15eacdf7512755c27686822e0052eb9042"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/423c6939758fb3b9cf5abbd1e7792068a5c4ae8c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/49bfcbfd989a8f1f23e705759a6bb099de2cff9f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5946fbf48355f5a8caeff72580c7658da5966b86"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8c3ec88b03e9e4ca117dcdc4204fd3edcd02084f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b25b60d076164edb3025e85aabd2cf50a5215b91"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.