CVE-2026-53013 Details
Description
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.
A vulnerability in the Linux kernel's macvlan implementation can lead to a netlink message size error. The issue arises because the macvlan_get_size() function does not properly account for the IFLA_MACVLAN_BC_CUTOFF attribute. This oversight causes the nla_put_s32() function to fail with an 'out of message size' error when the netlink socket buffer runs out of space. As a result, the interface information cannot be successfully dumped, which can disrupt network management operations. The problem can be reproduced by creating a macvlan interface in bridge mode, setting the broadcast cutoff to zero, and then attempting to display the interface details, which will fail due to the size calculation error.
The vulnerability has been addressed in the Linux kernel. Users should upgrade to the latest version where this issue has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/1c004f14ccdc11585625c168bb9a7c5e1b8afb0c | kernel.org | Patch |
| https://git.kernel.org/stable/c/4979252758387b338ca968ba7e0515b0ae2257e3 | kernel.org | Patch |
| https://git.kernel.org/stable/c/77ecfa4e27f282d224215895ddfbeb916fc75e24 | kernel.org | Patch |
| https://git.kernel.org/stable/c/b6b7154e9f5d75b608ceb2d05b376de8c638c40e | kernel.org | Patch |
| https://git.kernel.org/stable/c/fa92a77b0ed4d5f11a71665a232ac5a54a4b055d | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| NVD-CWE-noinfo | Insufficient Information to Classify Weakness | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 6.4, < 6.6.141 >= 6.7, < 6.12.91 >= 6.13, < 6.18.33 >= 6.19, < 7.0.10 |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 14, 2026 | Initial Analysis | [email protected] |
| Jun 24, 2026 | New CVE Received | kernel.org |