Vulnerability-Lookup

GHSA-MH75-V23P-MCVC

Vulnerability from github – Published: 2026-06-24 18:32 – Updated: 2026-07-14 18:31

Details

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

macvlan: fix macvlan_get_size() not reserving space for IFLA_MACVLAN_BC_CUTOFF

macvlan_get_size() does not account for IFLA_MACVLAN_BC_CUTOFF, but macvlan_fill_info() conditionally includes it when port->bc_cutoff != 1. This causes nla_put_s32() to fail with -EMSGSIZE when the netlink skb runs out of space, triggering a WARN_ON in rtnetlink and preventing the interface from being dumped.

The bug can be reproduced with:

ip link add macvlan0 link eth0 type macvlan mode bridge ip link set macvlan0 type macvlan bc_cutoff 0 ip -d link show macvlan0 # fails with -EMSGSIZE

The bc_cutoff feature was added in commit 954d1fa1ac93 ("macvlan: Add netlink attribute for broadcast cutoff"), which added the nla_put_s32() call in macvlan_fill_info() but missed adding the corresponding nla_total_size(4) in macvlan_get_size(). A follow-up commit 55cef78c244d ("macvlan: add forgotten nla_policy for IFLA_MACVLAN_BC_CUTOFF") fixed the missing nla_policy entry but still did not fix the size calculation.

Severity

5.5 (Medium)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-53013"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-24T17:17:12Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmacvlan: fix macvlan_get_size() not reserving space for IFLA_MACVLAN_BC_CUTOFF\n\nmacvlan_get_size() does not account for IFLA_MACVLAN_BC_CUTOFF, but\nmacvlan_fill_info() conditionally includes it when port-\u003ebc_cutoff != 1.\nThis causes nla_put_s32() to fail with -EMSGSIZE when the netlink skb\nruns out of space, triggering a WARN_ON in rtnetlink and preventing the\ninterface from being dumped.\n\nThe bug can be reproduced with:\n\n  ip link add macvlan0 link eth0 type macvlan mode bridge\n  ip link set macvlan0 type macvlan bc_cutoff 0\n  ip -d link show macvlan0   # fails with -EMSGSIZE\n\nThe bc_cutoff feature was added in commit 954d1fa1ac93 (\"macvlan: Add\nnetlink attribute for broadcast cutoff\"), which added the nla_put_s32()\ncall in macvlan_fill_info() but missed adding the corresponding\nnla_total_size(4) in macvlan_get_size(). A follow-up commit\n55cef78c244d (\"macvlan: add forgotten nla_policy for\nIFLA_MACVLAN_BC_CUTOFF\") fixed the missing nla_policy entry but still\ndid not fix the size calculation.",
  "id": "GHSA-mh75-v23p-mcvc",
  "modified": "2026-07-14T18:31:50Z",
  "published": "2026-06-24T18:32:43Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53013"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1c004f14ccdc11585625c168bb9a7c5e1b8afb0c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4979252758387b338ca968ba7e0515b0ae2257e3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/77ecfa4e27f282d224215895ddfbeb916fc75e24"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b6b7154e9f5d75b608ceb2d05b376de8c638c40e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fa92a77b0ed4d5f11a71665a232ac5a54a4b055d"
    }
  ],
  "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"
    }
  ]
}

CVE-2026-53013 (GCVE-0-2026-53013)

Vulnerability from cvelistv5 – Published: 2026-06-24 16:29 – Updated: 2026-06-24 16:29

Title

macvlan: fix macvlan_get_size() not reserving space for IFLA_MACVLAN_BC_CUTOFF

Summary

In the Linux kernel, the following vulnerability has been resolved: macvlan: fix macvlan_get_size() not reserving space for IFLA_MACVLAN_BC_CUTOFF macvlan_get_size() does not account for IFLA_MACVLAN_BC_CUTOFF, but macvlan_fill_info() conditionally includes it when port->bc_cutoff != 1. This causes nla_put_s32() to fail with -EMSGSIZE when the netlink skb runs out of space, triggering a WARN_ON in rtnetlink and preventing the interface from being dumped. The bug can be reproduced with: ip link add macvlan0 link eth0 type macvlan mode bridge ip link set macvlan0 type macvlan bc_cutoff 0 ip -d link show macvlan0 # fails with -EMSGSIZE The bc_cutoff feature was added in commit 954d1fa1ac93 ("macvlan: Add netlink attribute for broadcast cutoff"), which added the nla_put_s32() call in macvlan_fill_info() but missed adding the corresponding nla_total_size(4) in macvlan_get_size(). A follow-up commit 55cef78c244d ("macvlan: add forgotten nla_policy for IFLA_MACVLAN_BC_CUTOFF") fixed the missing nla_policy entry but still did not fix the size calculation.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

5 references

URL	Tags
https://git.kernel.org/stable/c/4979252758387b338…
https://git.kernel.org/stable/c/77ecfa4e27f282d22…
https://git.kernel.org/stable/c/b6b7154e9f5d75b60…
https://git.kernel.org/stable/c/1c004f14ccdc11585…
https://git.kernel.org/stable/c/fa92a77b0ed4d5f11…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 954d1fa1ac93aa8a66f7d9a9ba545cf7f020d348 , < 4979252758387b338ca968ba7e0515b0ae2257e3 (git) Affected: 954d1fa1ac93aa8a66f7d9a9ba545cf7f020d348 , < 77ecfa4e27f282d224215895ddfbeb916fc75e24 (git) Affected: 954d1fa1ac93aa8a66f7d9a9ba545cf7f020d348 , < b6b7154e9f5d75b608ceb2d05b376de8c638c40e (git) Affected: 954d1fa1ac93aa8a66f7d9a9ba545cf7f020d348 , < 1c004f14ccdc11585625c168bb9a7c5e1b8afb0c (git) Affected: 954d1fa1ac93aa8a66f7d9a9ba545cf7f020d348 , < fa92a77b0ed4d5f11a71665a232ac5a54a4b055d (git)
Linux	Linux	Affected: 6.4 Unaffected: 0 , < 6.4 (semver) Unaffected: 6.6.141 , ≤ 6.6.* (semver) Unaffected: 6.12.91 , ≤ 6.12.* (semver) Unaffected: 6.18.33 , ≤ 6.18.* (semver) Unaffected: 7.0.10 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

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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.

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