CVE-2025-38006: Linux kernel · net: mctp: Don't access ifa_index when missing
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in f11cf946c0a92c560a890d68e4775723353599e1 : update Linux kernel when convenient.
Data as of 30 Oct 2026, 12:49 UTC
Rated by Threat Radar · No CVSS score from NVD or the CNA
Thin evidence
One scorer or none- Patch
- Available – fixed in f11cf946c0a92c560a890d68e4775723353599e1, d22efcd246a7688599eefcf8e5c7985a3854ef5d, d4d1561d17eb72908e4489c0900d96e0484fac20 +3
Exploitation evidence
Disclosed: evidence found.
CVE published 18 Jun 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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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
References
- git.kernel.org/stable/c/8ef7b3f0db69e2f4a80be351f6aee9a4c2332ef9 (opens in a new tab)
- git.kernel.org/stable/c/d22efcd246a7688599eefcf8e5c7985a3854ef5d (opens in a new tab)
- git.kernel.org/stable/c/acab78ae12c7fefb4f3bfe22e00770a5faa42724 (opens in a new tab)
- git.kernel.org/stable/c/d4d1561d17eb72908e4489c0900d96e0484fac20 (opens in a new tab)
- git.kernel.org/stable/c/24fa213dffa470166ec014f979f36c6ff44afb45 (opens in a new tab)
- git.kernel.org/stable/c/f11cf946c0a92c560a890d68e4775723353599e1 (opens in a new tab)