CVE-2023-53516

Published Oct 1, 2025

Last updated 18 days ago

CVSS high 7.8

Overview

Description
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.
Source
416baaa9-dc9f-4396-8d5f-8c081fb06d67
NVD status
Analyzed
Products
linux_kernel

Risk scores

CVSS 3.1

Type
Primary
Base score
7.8
Impact score
5.9
Exploitability score
1.8
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Severity
HIGH

Weaknesses

nvd@nist.gov
CWE-787

Social media

Hype score
Not currently trending

  1. 🚨 HIGH: CVE-2023-53516 (CVSS 7.8) Linux kernel macvlan vulnerability allows local privilege escalation via malformed netlink attributes. OOB heap read/write possible. Patch immediately. #CVE #Vulnerability #PatchNow #ThreatIntel https://t.co/zjB3vuL1WT

    @giuseppe_1337

    12 Apr 2026

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  2. CVE-2023-53516 In the Linux kernel, the following vulnerability has been resolved: macvlan: add forgotten nla_policy for IFLA_MACVLAN_BC_CUTOFF The previous commit 954d1fa1ac93 ("… https://t.co/0EoYVX3Eke

    @CVEnew

    1 Oct 2025

    61 Impressions

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Configurations

Related CVEs

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References

Sources include official advisories and independent security research.