CVE-2025-38006 Information

Jun 19, 2025 cve

Description

In the Linux kernel the following vulnerability has been resolved:

net: mctp: Don’t access ifa_index when missing

In mctp_dump_addrinfo ifa_index can be used to filter interfaces but only when the struct ifaddrmsg is provided. Otherwise it will be comparing to uninitialised memory - reproducible in the syzkaller case from dhcpd or busybox \ip addr show.

The kernel MCTP implementation has always filtered by ifa_index so existing userspace programs expecting to dump MCTP addresses must already be passing a valid ifa_index value (either 0 or a real index).

BUG: KMSAN: uninit-value in mctp_dump_addrinfo+0x208/0xac0 net/mctp/device.c:128 mctp_dump_addrinfo+0x208/0xac0 net/mctp/device.c:128 rtnl_dump_all+0x3ec/0x5b0 net/core/rtnetlink.c:4380 rtnl_dumpit+0xd5/0x2f0 net/core/rtnetlink.c:6824 netlink_dump+0x97b/0x1690 net/netlink/af_netlink.c:2309

Reference

https://git.kernel.org/stable/c/24fa213dffa470166ec014f979f36c6ff44afb45 https://git.kernel.org/stable/c/acab78ae12c7fefb4f3bfe22e00770a5faa42724 https://git.kernel.org/stable/c/d4d1561d17eb72908e4489c0900d96e0484fac20 https://git.kernel.org/stable/c/f11cf946c0a92c560a890d68e4775723353599e1

CNNVD-202506-2144 (Published: 2025-06-18)

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