CVE-2025-21972

EUVD-2025-9348

01.04.2025, 16:15

In the Linux kernel, the following vulnerability has been resolved:

net: mctp: unshare packets when reassembling

Ensure that the frag_list used for reassembly isn't shared with other
packets. This avoids incorrect reassembly when packets are cloned, and
prevents a memory leak due to circular references between fragments and
their skb_shared_info.

The upcoming MCTP-over-USB driver uses skb_clone which can trigger the
problem - other MCTP drivers don't share SKBs.

A kunit test is added to reproduce the issue.

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
NIST	Primary	5.5 MEDIUM	LOCAL	LOW	LOW	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Base Score

CVSS 3.x

EPSS Score

Percentile: 8%

Affected Products (NVD)

Vendor	Product	Version
linux	linux_kernel	5.15 ≤ 𝑥 < 6.12.20
linux	linux_kernel	6.13 ≤ 𝑥 < 6.13.8
linux	linux_kernel	6.14:rc1
linux	linux_kernel	6.14:rc2
linux	linux_kernel	6.14:rc3
linux	linux_kernel	6.14:rc4
linux	linux_kernel	6.14:rc5
linux	linux_kernel	6.14:rc6

𝑥

= Vulnerable software versions

Debian Releases

Debian Product

Codename

linux

bookworm	vulnerable
bookworm (security)	vulnerable
bullseye	5.10.223-1 fixed
bullseye (security)	5.10.257-1 fixed
forky	7.0.10-1 fixed
sid	7.0.10-1 fixed
trixie	6.12.86-1 fixed
trixie (security)	6.12.90-2 fixed

openSUSE / SLES Releases

openSUSE Product

Release

kernel-64kb

suse enterprise desktop 15 SP6	6.4.0-150600.23.50.1 fixed
suse enterprise desktop 15 SP7	6.4.0-150700.53.3.1 fixed
suse enterprise sap 15 SP6	6.4.0-150600.23.50.1 fixed
suse enterprise sap 15 SP7	6.4.0-150700.53.3.1 fixed
suse enterprise server 15 SP6	6.4.0-150600.23.50.1 fixed
suse enterprise server 15 SP7	6.4.0-150700.53.3.1 fixed

kernel-azure

suse enterprise sap 15 SP6	6.4.0-150600.8.37.1 fixed
suse enterprise sap 15 SP7	6.4.0-150700.20.3.1 fixed
suse enterprise server 15 SP6	6.4.0-150600.8.37.1 fixed
suse enterprise server 15 SP7	6.4.0-150700.20.3.1 fixed

kernel-default

suse enterprise desktop 15 SP6	6.4.0-150600.23.50.1 fixed
suse enterprise desktop 15 SP7	6.4.0-150700.53.3.1 fixed
suse enterprise sap 15 SP6	6.4.0-150600.23.50.1 fixed
suse enterprise sap 15 SP7	6.4.0-150700.53.3.1 fixed
suse enterprise server 15 SP6	6.4.0-150600.23.50.1 fixed
suse enterprise server 15 SP7	6.4.0-150700.53.3.1 fixed

kernel-default-base

suse enterprise desktop 15 SP6	6.4.0-150600.23.50.1.150600.12.22.1 fixed
suse enterprise desktop 15 SP7	6.4.0-150700.53.3.1.150700.17.2.1 fixed
suse enterprise sap 15 SP6	6.4.0-150600.23.50.1.150600.12.22.1 fixed
suse enterprise sap 15 SP7	6.4.0-150700.53.3.1.150700.17.2.1 fixed
suse enterprise server 15 SP6	6.4.0-150600.23.50.1.150600.12.22.1 fixed
suse enterprise server 15 SP7	6.4.0-150700.53.3.1.150700.17.2.1 fixed

kernel-docs

suse enterprise desktop 15 SP6	6.4.0-150600.23.50.1 fixed
suse enterprise desktop 15 SP7	6.4.0-150700.53.3.1 fixed
suse enterprise sap 15 SP6	6.4.0-150600.23.50.1 fixed
suse enterprise sap 15 SP7	6.4.0-150700.53.3.1 fixed
suse enterprise server 15 SP6	6.4.0-150600.23.50.1 fixed
suse enterprise server 15 SP7	6.4.0-150700.53.3.1 fixed

kernel-macros

suse enterprise desktop 15 SP6	6.4.0-150600.23.50.1 fixed
suse enterprise desktop 15 SP7	6.4.0-150700.53.3.1 fixed
suse enterprise sap 15 SP6	6.4.0-150600.23.50.1 fixed
suse enterprise sap 15 SP7	6.4.0-150700.53.3.1 fixed
suse enterprise server 15 SP6	6.4.0-150600.23.50.1 fixed
suse enterprise server 15 SP7	6.4.0-150700.53.3.1 fixed

kernel-obs-build

suse enterprise desktop 15 SP6	6.4.0-150600.23.50.1 fixed
suse enterprise desktop 15 SP7	6.4.0-150700.53.3.1 fixed
suse enterprise sap 15 SP6	6.4.0-150600.23.50.1 fixed
suse enterprise sap 15 SP7	6.4.0-150700.53.3.1 fixed
suse enterprise server 15 SP6	6.4.0-150600.23.50.1 fixed
suse enterprise server 15 SP7	6.4.0-150700.53.3.1 fixed

kernel-source

suse enterprise desktop 15 SP6	6.4.0-150600.23.50.1 fixed
suse enterprise desktop 15 SP7	6.4.0-150700.53.3.1 fixed
suse enterprise sap 15 SP6	6.4.0-150600.23.50.1 fixed
suse enterprise sap 15 SP7	6.4.0-150700.53.3.1 fixed
suse enterprise server 15 SP6	6.4.0-150600.23.50.1 fixed
suse enterprise server 15 SP7	6.4.0-150700.53.3.1 fixed

kernel-source-azure

suse enterprise sap 15 SP6	6.4.0-150600.8.37.1 fixed
suse enterprise sap 15 SP7	6.4.0-150700.20.3.1 fixed
suse enterprise server 15 SP6	6.4.0-150600.8.37.1 fixed
suse enterprise server 15 SP7	6.4.0-150700.20.3.1 fixed

kernel-syms

suse enterprise desktop 15 SP6	6.4.0-150600.23.50.1 fixed
suse enterprise desktop 15 SP7	6.4.0-150700.53.3.1 fixed
suse enterprise sap 15 SP6	6.4.0-150600.23.50.1 fixed
suse enterprise sap 15 SP7	6.4.0-150700.53.3.1 fixed
suse enterprise server 15 SP6	6.4.0-150600.23.50.1 fixed
suse enterprise server 15 SP7	6.4.0-150700.53.3.1 fixed

kernel-syms-azure

suse enterprise sap 15 SP6	6.4.0-150600.8.37.1 fixed
suse enterprise sap 15 SP7	6.4.0-150700.20.3.1 fixed
suse enterprise server 15 SP6	6.4.0-150600.8.37.1 fixed
suse enterprise server 15 SP7	6.4.0-150700.20.3.1 fixed

kernel-zfcpdump

suse enterprise desktop 15 SP6	6.4.0-150600.23.50.1 fixed
suse enterprise desktop 15 SP7	6.4.0-150700.53.3.1 fixed
suse enterprise sap 15 SP6	6.4.0-150600.23.50.1 fixed
suse enterprise sap 15 SP7	6.4.0-150700.53.3.1 fixed
suse enterprise server 15 SP6	6.4.0-150600.23.50.1 fixed
suse enterprise server 15 SP7	6.4.0-150700.53.3.1 fixed

Common Weakness Enumeration

CWE-401 - Missing Release of Memory after Effective Lifetime
The software does not sufficiently track and release allocated memory after it has been used, which slowly consumes remaining memory.

References

https://git.kernel.org/stable/c/5c47d5bfa7b096cf8890afac32141c578583f8e0

https://git.kernel.org/stable/c/f44fff3d3c6cd67b6f348b821d73c4d6888c7a6e

https://git.kernel.org/stable/c/f5d83cf0eeb90fade4d5c4d17d24b8bee9ceeecc