Linux Kernel up to 6.4.7 drivers/net/macvlan.c nla_policy out-of-bounds write

CVSS Meta Temp Score
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CTI Interest Score
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6.5$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.4.7. It has been declared as problematic. This issue affects the function nla_policy of the file drivers/net/macvlan.c. Such manipulation leads to an unknown weakness. This vulnerability is listed as CVE-2023-53516. There is no available exploit. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.4.7. It has been rated as problematic. Affected by this issue is the function nla_policy of the file drivers/net/macvlan.c. Using CWE to declare the problem leads to CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. The impact remains unknown. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: macvlan: add forgotten nla_policy for IFLA_MACVLAN_BC_CUTOFF The previous commit 954d1fa1ac93 ("macvlan: Add netlink attribute for broadcast cutoff") added one additional attribute named IFLA_MACVLAN_BC_CUTOFF to allow broadcast cutfoff. However, it forgot to describe the nla_policy at macvlan_policy (drivers/net/macvlan.c). Hence, this suppose NLA_S32 (4 bytes) integer can be faked as empty (0 bytes) by a malicious user, which could leads to OOB in heap just like CVE-2023-3773. To fix it, this commit just completes the nla_policy description for IFLA_MACVLAN_BC_CUTOFF. This enforces the length check and avoids the potential OOB read.

The advisory is shared for download at git.kernel.org. This vulnerability is handled as CVE-2023-53516 since 10/01/2025. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 01/27/2026).

The vulnerability scanner Nessus provides a plugin with the ID 269639 (Linux Distros Unpatched Vulnerability : CVE-2023-53516), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.4.8 eliminates this vulnerability. Applying the patch 79f44709aa7a744fbfbadd4aef678443290c6991/55cef78c244d0d076f5a75a35530ca63c92f4426 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (269639), EUVD (EUVD-2025-32742) and CERT Bund (WID-SEC-2025-2187). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • SUSE Linux
  • Oracle Linux
  • Open Source Linux Kernel
  • Dell Secure Connect Gateway

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.6
VulDB Meta Temp Score: 6.5

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔒

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Out-of-bounds write
CWE: CWE-787 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 269639
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2023-53516

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.4.8
Patch: 79f44709aa7a744fbfbadd4aef678443290c6991/55cef78c244d0d076f5a75a35530ca63c92f4426

Timelineinfo

10/01/2025 Advisory disclosed
10/01/2025 +0 days CVE reserved
10/01/2025 +0 days VulDB entry created
01/27/2026 +118 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2023-53516 (🔒)
GCVE (CVE): GCVE-0-2023-53516
GCVE (VulDB): GCVE-100-326528
EUVD: 🔒
CERT Bund: WID-SEC-2025-2187 - Linux Kernel: Mehrere Schwachstellen ermöglichen Denial of Service

Entryinfo

Created: 10/01/2025 14:39
Updated: 01/27/2026 17:43
Changes: 10/01/2025 14:39 (57), 10/12/2025 00:03 (2), 11/29/2025 03:40 (7), 01/27/2026 02:46 (13), 01/27/2026 17:43 (1)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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