CVE-2024-35827 (GCVE-0-2024-35827)

Vulnerability from cvelistv5 – Published: 2024-05-17 13:41 – Updated: 2026-08-05 11:30
VLAI
Title
io_uring/net: fix overflow check in io_recvmsg_mshot_prep()
Summary
In the Linux kernel, the following vulnerability has been resolved: io_uring/net: fix overflow check in io_recvmsg_mshot_prep() The "controllen" variable is type size_t (unsigned long). Casting it to int could lead to an integer underflow. The check_add_overflow() function considers the type of the destination which is type int. If we add two positive values and the result cannot fit in an integer then that's counted as an overflow. However, if we cast "controllen" to an int and it turns negative, then negative values *can* fit into an int type so there is no overflow. Good: 100 + (unsigned long)-4 = 96 <-- overflow Bad: 100 + (int)-4 = 96 <-- no overflow I deleted the cast of the sizeof() as well. That's not a bug but the cast is unnecessary.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 9b0fc3c054ff2eb13753104884f1045b5bb3a627 , < 868ec868616438df487b9e2baa5a99f8662cc47c (git)
Affected: 9b0fc3c054ff2eb13753104884f1045b5bb3a627 , < 59a534690ecc3af72c6ab121aeac1237a4adae66 (git)
Affected: 9b0fc3c054ff2eb13753104884f1045b5bb3a627 , < 0c8c74bb59e7d77554016efc34c2d10376985e5e (git)
Affected: 9b0fc3c054ff2eb13753104884f1045b5bb3a627 , < b6563ad0d599110bd5cf8f56c47d279c3ed796fe (git)
Affected: 9b0fc3c054ff2eb13753104884f1045b5bb3a627 , < 8ede3db5061bb1fe28e2c9683329aafa89d2b1b4 (git)
Create a notification for this product.
Linux Linux Affected: 6.0
Unaffected: 0 , < 6.0 (semver)
Unaffected: 6.1.83 , ≤ 6.1.* (semver)
Unaffected: 6.6.23 , ≤ 6.6.* (semver)
Unaffected: 6.7.11 , ≤ 6.7.* (semver)
Unaffected: 6.8.2 , ≤ 6.8.* (semver)
Unaffected: 6.9 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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Si sumamos dos valores positivos y el resultado no cabe en un n\u00famero entero, entonces se cuenta como un desbordamiento. Sin embargo, si convertimos \\\"controllen\\\" en un int y se vuelve negativo, entonces los valores negativos *pueden* caber en un tipo int para que no haya desbordamiento. Bueno: 100 + (unsigned long)-4 = 96 \u0026lt;-- overflow Malo: 100 + (int)-4 = 96 \u0026lt;-- no overflow Tambi\u00e9n elimin\u00e9 el cast de sizeof(). Eso no es un error, pero el cast es 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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-08-04T22:48:21+00:00",
      "cve": "CVE-2024-35827",
      "id": "CVE-2024-35827",
      "initial_release_date": "2024-05-17T00:00:00+00:00",
      "product_status:fixed": "280",
      "product_status:known_affected": "22",
      "product_status:known_not_affected": "98",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: io_uring/net: fix overflow check in io_recvmsg_mshot_prep()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-35827.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-23T02:06:54Z",
      "cve": "CVE-2024-35827",
      "id": "CVE-2024-35827",
      "initial_release_date": "2024-05-21T02:00:04Z",
      "product_status:known_affected": "421",
      "product_status:known_not_affected": "311",
      "product_status:recommended": "358",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2024-35827",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2024-35827.json",
      "version": "76"
    },
    "vulnrichment": {
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Per kernel scoring guidance io_uring is Local.\\nAC:L - The attacker directly supplies the malicious msg_controllen value in their own user_msghdr, and the integer truncation is fully deterministic \\u2014 no race, no memory-layout dependency, no timing window. A single submitted SQE reliably bypasses the overflow check.\\nPR:L - Any unprivileged local user who can call io_uring_setup() can reach the path; no capability, no CAP_NET_ADMIN, and no root is required, and the socket used can be an ordinary user-created socket. Only the ability to issue syscalls is needed, so basic user privileges suffice.\\nUI:N - The attacker submits the crafted recvmsg SQE entirely on their own; no victim action, no filesystem mount, and no privileged process cooperation is needed to trigger the bug.\\nS:U - The bypassed check and its consequences stay within the same security authority \\u2014 the io_uring context and the address space of the submitting task. 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Casting it\\nto int could lead to an integer underflow.\\n\\nThe check_add_overflow() function considers the type of the destination\\nwhich is type int.  If we add two positive values and the result cannot\\nfit in an integer then that\u0027s counted as an overflow.\\n\\nHowever, if we cast \\\"controllen\\\" to an int and it turns negative, then\\nnegative values *can* fit into an int type so there is no overflow.\\n\\nGood: 100 + (unsigned long)-4 = 96  \u003c-- overflow\\n Bad: 100 + (int)-4 = 96 \u003c-- no overflow\\n\\nI deleted the cast of the sizeof() as well.  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  }
}



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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.


Detection rules are retrieved from Rulezet.