CVE-2025-38006
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
Affected products
7cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*+ 6 more
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*range: >=5.15,<6.6.92
- cpe:2.3:o:linux:linux_kernel:6.15:rc1:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:6.15:rc2:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:6.15:rc3:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:6.15:rc4:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:6.15:rc5:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:6.15:rc6:*:*:*:*:*:*
Patches
4acab78ae12c7d4d1561d17eb24fa213dffa4f11cf946c0a9Vulnerability mechanics
Generated by null/stub on May 9, 2026. Inputs: CWE entries + fix-commit diffs from this CVE's patches. Citations validated against bundle.
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