ghsa-m235-57qr-6fh8
Vulnerability from github
Published
2025-10-01 12:30
Modified
2025-10-01 12:30
Details

In the Linux kernel, the following vulnerability has been resolved:

macvlan: add forgotten nla_policy for IFLA_MACVLAN_BC_CUTOFF

The previous commit 954d1fa1ac93 ("macvlan: Add netlink attribute for broadcast cutoff") added one additional attribute named IFLA_MACVLAN_BC_CUTOFF to allow broadcast cutfoff.

However, it forgot to describe the nla_policy at macvlan_policy (drivers/net/macvlan.c). Hence, this suppose NLA_S32 (4 bytes) integer can be faked as empty (0 bytes) by a malicious user, which could leads to OOB in heap just like CVE-2023-3773.

To fix it, this commit just completes the nla_policy description for IFLA_MACVLAN_BC_CUTOFF. This enforces the length check and avoids the potential OOB read.

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{
  "affected": [],
  "aliases": [
    "CVE-2023-53516"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-10-01T12:15:55Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmacvlan: add forgotten nla_policy for IFLA_MACVLAN_BC_CUTOFF\n\nThe previous commit 954d1fa1ac93 (\"macvlan: Add netlink attribute for\nbroadcast cutoff\") added one additional attribute named\nIFLA_MACVLAN_BC_CUTOFF to allow broadcast cutfoff.\n\nHowever, it forgot to describe the nla_policy at macvlan_policy\n(drivers/net/macvlan.c). Hence, this suppose NLA_S32 (4 bytes) integer\ncan be faked as empty (0 bytes) by a malicious user, which could leads\nto OOB in heap just like CVE-2023-3773.\n\nTo fix it, this commit just completes the nla_policy description for\nIFLA_MACVLAN_BC_CUTOFF. This enforces the length check and avoids the\npotential OOB read.",
  "id": "GHSA-m235-57qr-6fh8",
  "modified": "2025-10-01T12:30:31Z",
  "published": "2025-10-01T12:30:31Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-53516"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/55cef78c244d0d076f5a75a35530ca63c92f4426"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/79f44709aa7a744fbfbadd4aef678443290c6991"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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