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VulnerabilityPublished Updated

CVE-2025-38006: Linux kernel · net: mctp: Don't access ifa_index when missing

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in f11cf946c0a92c560a890d68e4775723353599e1 : update Linux kernel when convenient.

Data as of 30 Oct 2026, 12:49 UTC

Severity
Unrated

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

  1. Disclosed: evidence found.

    CVE published 18 Jun 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ 583be982d93479ea3d85091b0fd0b01201ede87d, < f11cf946c0a92c560a890d68e4775723353599e1
Fixed in
  • f11cf946c0a92c560a890d68e4775723353599e1
LinuxLinuxAffected
  • ≥ 583be982d93479ea3d85091b0fd0b01201ede87d, < d22efcd246a7688599eefcf8e5c7985a3854ef5d
Fixed in
  • d22efcd246a7688599eefcf8e5c7985a3854ef5d
LinuxLinuxAffected
  • ≥ 583be982d93479ea3d85091b0fd0b01201ede87d, < d4d1561d17eb72908e4489c0900d96e0484fac20
Fixed in
  • d4d1561d17eb72908e4489c0900d96e0484fac20
LinuxLinuxAffected
  • ≥ 583be982d93479ea3d85091b0fd0b01201ede87d, < acab78ae12c7fefb4f3bfe22e00770a5faa42724
Fixed in
  • acab78ae12c7fefb4f3bfe22e00770a5faa42724
LinuxLinuxAffected
  • ≥ 583be982d93479ea3d85091b0fd0b01201ede87d, < 24fa213dffa470166ec014f979f36c6ff44afb45
Fixed in
  • 24fa213dffa470166ec014f979f36c6ff44afb45
LinuxLinuxAffected
  • ≥ 583be982d93479ea3d85091b0fd0b01201ede87d, < 8ef7b3f0db69e2f4a80be351f6aee9a4c2332ef9
Fixed in
  • 8ef7b3f0db69e2f4a80be351f6aee9a4c2332ef9

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

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