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 ("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 following products are affected by CVE-2023-53516 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2023-53516.

URL	Resource
https://git.kernel.org/stable/c/55cef78c244d0d076f5a75a35530ca63c92f4426
https://git.kernel.org/stable/c/79f44709aa7a744fbfbadd4aef678443290c6991
https://lore.kernel.org/linux-cve-announce/2025100131-CVE-2023-53516-ca63@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2023-53516
https://www.cve.org/CVERecord?id=CVE-2023-53516