🛡️ CVE-2025-38006 — kernel

🟡 CVSS 5.5 — Medium ✅ No Known Exploit NVD
5.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

net: mctp: Don't access ifa_index when missing

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

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

Affected software

CVE-2025-38006 is recorded against 2 packages.

  • kernel (from 6.13.0 up to 6.14.8)
  • linux-kernel

Timeline and source

Published on 18 June 2025 and last revised on 15 July 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

CVE-2025-38006 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Medium
CVSS Score 5.5
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2025-06-18
Updated 2026-08-12
Modified 2026-07-15

Affected Packages

Software From version Fixed in
kernel 6.13.0 6.14.8
linux-kernel — —

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