CVE-2026-53013

Local interface-dump denial via undersized netlink allocation

Published Jun 24, 2026 · Updated Jun 24, 2026

Denial of service in the Linux Kernel macvlan subsystem allows local users to prevent interface dumps through netlink operations. macvlan_get_size() omits space for IFLA_MACVLAN_BC_CUTOFF while macvlan_fill_info() conditionally writes it, so nla_put_s32() exhausts the netlink skb and returns -EMSGSIZE. Reachability requires local privileges to create or reconfigure a macvlan interface with bc_cutoff not equal to 1; the observed consequence is a WARN_ON and a failed interface dump, not a system crash.

CVSS severity5.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in the Linux Kernel macvlan subsystem allows local users to prevent interface dumps through netlink operations. macvlan_get_size() omits space for IFLA_MACVLAN_BC_CUTOFF while macvlan_fill_info() conditionally writes it, so nla_put_s32() exhausts the netlink skb and returns -EMSGSIZE. Reachability requires local privileges to create or reconfigure a macvlan interface with bc_cutoff not equal to 1; the observed consequence is a WARN_ON and a failed interface dump, not a system crash.

The record

CVE
CVE-2026-53013
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.4
  2. Affected versionversion=954d1fa1ac93aa8a66f7d9a9ba545cf7f020d348 <1c004f14ccdc11585625c168bb9a7c5e1b8afb0c
  3. Affected versionversion=954d1fa1ac93aa8a66f7d9a9ba545cf7f020d348 <4979252758387b338ca968ba7e0515b0ae2257e3
  4. Affected versionversion=954d1fa1ac93aa8a66f7d9a9ba545cf7f020d348 <77ecfa4e27f282d224215895ddfbeb916fc75e24
  5. Affected versionversion=954d1fa1ac93aa8a66f7d9a9ba545cf7f020d348 <b6b7154e9f5d75b608ceb2d05b376de8c638c40e
  6. Affected versionversion=954d1fa1ac93aa8a66f7d9a9ba545cf7f020d348 <fa92a77b0ed4d5f11a71665a232ac5a54a4b055d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.4; version=954d1fa1ac93aa8a66f7d9a9ba545cf7f020d348 <1c004f14ccdc11585625c168bb9a7c5e1b8afb0c; version=954d1fa1ac93aa8a66f7d9a9ba545cf7f020d348 <4979252758387b338ca968ba7e0515b0ae2257e3; version=954d1fa1ac93aa8a66f7d9a9ba545cf7f020d348 <77ecfa4e27f282d224215895ddfbeb916fc75e24; version=954d1fa1ac93aa8a66f7d9a9ba545cf7f020d348 <b6b7154e9f5d75b608ceb2d05b376de8c638c40e; version=954d1fa1ac93aa8a66f7d9a9ba545cf7f020d348 <fa92a77b0ed4d5f11a71665a232ac5a54a4b055d

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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