CVE-2022-49776 (GCVE-0-2022-49776)

Vulnerability from cvelistv5 – Published: 2025-05-01 14:09 – Updated: 2025-05-04 08:45
VLAI?
Title
macvlan: enforce a consistent minimal mtu
Summary
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: <BROADCAST,MULTICAST> 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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 91572088e3fdbf4fe31cf397926d8b890fdb3237 , < d2fee7d121d189c6dc905b727d60e7043a6655bb (git)
Affected: 91572088e3fdbf4fe31cf397926d8b890fdb3237 , < 650137a7c0b2892df2e5b0bc112d7b09a78c93c8 (git)
Affected: 91572088e3fdbf4fe31cf397926d8b890fdb3237 , < a62aa84fe19eb24d083d600a074c009a0a66d4f3 (git)
Affected: 91572088e3fdbf4fe31cf397926d8b890fdb3237 , < e929ec98c0c3b10d9c07f3776df0c1a02d7a763e (git)
Affected: 91572088e3fdbf4fe31cf397926d8b890fdb3237 , < e41cbf98df22d08402e65174d147cbb187fe1a33 (git)
Affected: 91572088e3fdbf4fe31cf397926d8b890fdb3237 , < 2b055c719d8f94c15ec9b7659978133030c6a353 (git)
Affected: 91572088e3fdbf4fe31cf397926d8b890fdb3237 , < b64085b00044bdf3cd1c9825e9ef5b2e0feae91a (git)
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    Linux Linux Affected: 4.10
Unaffected: 0 , < 4.10 (semver)
Unaffected: 4.14.300 , ≤ 4.14.* (semver)
Unaffected: 4.19.267 , ≤ 4.19.* (semver)
Unaffected: 5.4.225 , ≤ 5.4.* (semver)
Unaffected: 5.10.156 , ≤ 5.10.* (semver)
Unaffected: 5.15.80 , ≤ 5.15.* (semver)
Unaffected: 6.0.10 , ≤ 6.0.* (semver)
Unaffected: 6.1 , ≤ * (original_commit_for_fix)
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{
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          "programFiles": [
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          "vendor": "Linux",
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      "cpeApplicability": [
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          "nodes": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-04T08:45:07.682Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/b64085b00044bdf3cd1c9825e9ef5b2e0feae91a"
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      "title": "macvlan: enforce a consistent minimal mtu",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49776",
    "datePublished": "2025-05-01T14:09:12.572Z",
    "dateReserved": "2025-04-16T07:17:33.805Z",
    "dateUpdated": "2025-05-04T08:45:07.682Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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