CVE-2025-38006

net: mctp: Don't access ifa_index when missing

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

N/A

CVSS

Severity:

EPSS 0.02%

Affected: Linux Linux

References

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

Frequently Asked Questions

What is the severity of CVE-2025-38006?: CVE-2025-38006 has not yet been assigned a CVSS score.
How to fix CVE-2025-38006?: To fix CVE-2025-38006, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-38006 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2025-38006 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-38006?: CVE-2025-38006 affects Linux Linux, Linux Linux.

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