CVE-2026-53013
macvlan: fix macvlan_get_size() not reserving space for IFLA_MACVLAN_BC_CUTOFF
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.
INFO
Published Date :
June 24, 2026, 5:17 p.m.
Last Modified :
July 14, 2026, 5:39 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update the Linux kernel to include the macvlan fix.
- Ensure the macvlan_get_size() reserves space for IFLA_MACVLAN_BC_CUTOFF.
- Verify netlink skb space in macvlan_fill_info().
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-53013.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-53013 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-53013
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-53013 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-53013 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Jul. 14, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Added CWE NVD-CWE-noinfo Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.91 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.18.33 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 7.0.10 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.4 up to (excluding) 6.6.141 Added Reference Type kernel.org: https://git.kernel.org/stable/c/1c004f14ccdc11585625c168bb9a7c5e1b8afb0c Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/4979252758387b338ca968ba7e0515b0ae2257e3 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/77ecfa4e27f282d224215895ddfbeb916fc75e24 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/b6b7154e9f5d75b608ceb2d05b376de8c638c40e Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/fa92a77b0ed4d5f11a71665a232ac5a54a4b055d Types: Patch -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jun. 24, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '954d1fa1ac93aa8a66f7d9a9ba545cf7f020d348', 'lessThan': '4979252758387b338ca968ba7e0515b0ae2257e3', 'versionType': 'git'}, {'status': 'affected', 'version': '954d1fa1ac93aa8a66f7d9a9ba545cf7f020d348', 'lessThan': '77ecfa4e27f282d224215895ddfbeb916fc75e24', 'versionType': 'git'}, {'status': 'affected', 'version': '954d1fa1ac93aa8a66f7d9a9ba545cf7f020d348', 'lessThan': 'b6b7154e9f5d75b608ceb2d05b376de8c638c40e', 'versionType': 'git'}, {'status': 'affected', 'version': '954d1fa1ac93aa8a66f7d9a9ba545cf7f020d348', 'lessThan': '1c004f14ccdc11585625c168bb9a7c5e1b8afb0c', 'versionType': 'git'}, {'status': 'affected', 'version': '954d1fa1ac93aa8a66f7d9a9ba545cf7f020d348', 'lessThan': 'fa92a77b0ed4d5f11a71665a232ac5a54a4b055d', 'versionType': 'git'}], 'programFiles': ['drivers/net/macvlan.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.4'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.4', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.141', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.91', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.33', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.0.10', 'versionType': 'semver', 'lessThanOrEqual': '7.0.*'}, {'status': 'unaffected', 'version': '7.1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/net/macvlan.c'], 'defaultStatus': 'affected'}] Added 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. Added Reference https://git.kernel.org/stable/c/1c004f14ccdc11585625c168bb9a7c5e1b8afb0c Added Reference https://git.kernel.org/stable/c/4979252758387b338ca968ba7e0515b0ae2257e3 Added Reference https://git.kernel.org/stable/c/77ecfa4e27f282d224215895ddfbeb916fc75e24 Added Reference https://git.kernel.org/stable/c/b6b7154e9f5d75b608ceb2d05b376de8c638c40e Added Reference https://git.kernel.org/stable/c/fa92a77b0ed4d5f11a71665a232ac5a54a4b055d