CVE-2023-53516

HIGH EPSS 3.2%
Published Oct 1, 20259mo ago · Modified Jun 17, 20262w ago
7.8 CVSS 3.1
High
Find Similar
Published Oct 1, 2025 9mo ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
7.8
Exploitability
1.8
Impact
5.9
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
3.2% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-787 Out-of-bounds Write Memory Safety

Affected Products 4

VendorProductVersionRange
linuxlinux_kernel*≥6.4  –  <6.4.8
linuxlinux_kernel6.5any
linuxlinux_kernel6.5any
linuxlinux_kernel6.5any

References 2

  • git.kernel.org https://git.kernel.org/stable/c/55cef78c244d0d076f5a75a35530ca63c92f4426
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/79f44709aa7a744fbfbadd4aef678443290c6991
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/55cef78c244d0d076f5a75a35530ca63c92f4426
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/79f44709aa7a744fbfbadd4aef678443290c6991
    Patch