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.
Product status
954d1fa1ac93aa8a66f7d9a9ba545cf7f020d348 before 79f44709aa7a744fbfbadd4aef678443290c6991
954d1fa1ac93aa8a66f7d9a9ba545cf7f020d348 before 55cef78c244d0d076f5a75a35530ca63c92f4426
6.4
Any version before 6.4
6.4.8
6.5
References
git.kernel.org/...c/79f44709aa7a744fbfbadd4aef678443290c6991
git.kernel.org/...c/55cef78c244d0d076f5a75a35530ca63c92f4426
