CVE-2023-53516

In the Linux kernel, the following vulnerability has been resolved:

macvlan: add forgotten nlapolicy for IFLAMACVLANBCCUTOFF

The previous commit 954d1fa1ac93 ("macvlan: Add netlink attribute for broadcast cutoff") added one additional attribute named IFLAMACVLANBC_CUTOFF to allow broadcast cutfoff.

However, it forgot to describe the nlapolicy at macvlanpolicy (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 nlapolicy description for IFLAMACVLANBCCUTOFF. This enforces the length check and avoids the potential OOB read.