ghsa-gpc4-vc7c-37hj
Vulnerability from github
Published
2025-05-01 15:31
Modified
2025-05-01 15:31
Details

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

macvlan: enforce a consistent minimal mtu

macvlan should enforce a minimal mtu of 68, even at link creation.

This patch avoids the current behavior (which could lead to crashes in ipv6 stack if the link is brought up)

$ ip link add macvlan1 link eno1 mtu 8 type macvlan # This should fail ! $ ip link sh dev macvlan1 5: macvlan1@eno1: mtu 8 qdisc noop state DOWN mode DEFAULT group default qlen 1000 link/ether 02:47:6c:24:74:82 brd ff:ff:ff:ff:ff:ff $ ip link set macvlan1 mtu 67 Error: mtu less than device minimum. $ ip link set macvlan1 mtu 68 $ ip link set macvlan1 mtu 8 Error: mtu less than device minimum.

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{
  "affected": [],
  "aliases": [
    "CVE-2022-49776"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-05-01T15:16:00Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmacvlan: enforce a consistent minimal mtu\n\nmacvlan should enforce a minimal mtu of 68, even at link creation.\n\nThis patch avoids the current behavior (which could lead to crashes\nin ipv6 stack if the link is brought up)\n\n$ ip link add macvlan1 link eno1 mtu 8 type macvlan  # This should fail !\n$ ip link sh dev macvlan1\n5: macvlan1@eno1: \u003cBROADCAST,MULTICAST\u003e mtu 8 qdisc noop\n    state DOWN mode DEFAULT group default qlen 1000\n    link/ether 02:47:6c:24:74:82 brd ff:ff:ff:ff:ff:ff\n$ ip link set macvlan1 mtu 67\nError: mtu less than device minimum.\n$ ip link set macvlan1 mtu 68\n$ ip link set macvlan1 mtu 8\nError: mtu less than device minimum.",
  "id": "GHSA-gpc4-vc7c-37hj",
  "modified": "2025-05-01T15:31:46Z",
  "published": "2025-05-01T15:31:46Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49776"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2b055c719d8f94c15ec9b7659978133030c6a353"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/650137a7c0b2892df2e5b0bc112d7b09a78c93c8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a62aa84fe19eb24d083d600a074c009a0a66d4f3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b64085b00044bdf3cd1c9825e9ef5b2e0feae91a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d2fee7d121d189c6dc905b727d60e7043a6655bb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e41cbf98df22d08402e65174d147cbb187fe1a33"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e929ec98c0c3b10d9c07f3776df0c1a02d7a763e"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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