CVE-2025-21795

EUVD-2025-5127

27.02.2025, 03:15

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

NFSD: fix hang in nfsd4_shutdown_callback

If nfs4_client is in courtesy state then there is no point to send
the callback. This causes nfsd4_shutdown_callback to hang since
cl_cb_inflight is not 0. This hang lasts about 15 minutes until TCP
notifies NFSD that the connection was dropped.

This patch modifies nfsd4_run_cb_work to skip the RPC call if
nfs4_client is in courtesy state.

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: 5%

Affected Products (NVD)

Vendor	Product	Version
linux	linux_kernel	5.10.220 ≤ 𝑥 < 5.10.235
linux	linux_kernel	5.15.154 ≤ 𝑥 < 5.15.179
linux	linux_kernel	5.19 ≤ 𝑥 < 6.1.129
linux	linux_kernel	6.2 ≤ 𝑥 < 6.6.79
linux	linux_kernel	6.7 ≤ 𝑥 < 6.12.16
linux	linux_kernel	6.13 ≤ 𝑥 < 6.13.4
linux	linux_kernel	6.14:rc1
linux	linux_kernel	6.14:rc2

𝑥

= Vulnerable software versions

Early Detection

Affected products identified ahead of NVD analysis through intelligence sources.

Vendor	Product	Version	Source
Siemens	SIMATIC S7-1500 CPU 1518-4 PN\/DP MFP	V3.1.5 ≤ 𝑥 < *	ADP
Siemens	SIMATIC S7-1500 CPU 1518-4 PN\/DP MFP	V3.1.5 ≤ 𝑥 < *	ADP
Siemens	SIMATIC S7-1500 CPU 1518F-4 PN\/DP MFP	V3.1.5 ≤ 𝑥 < *	ADP
Siemens	SIMATIC S7-1500 CPU 1518F-4 PN\/DP MFP	V3.1.5 ≤ 𝑥 < *	ADP
Siemens	SIMATIC S7-1500 TM MFP - GNU\/Linux subsystem	𝑥 < *	ADP
Siemens	SIPLUS S7-1500 CPU 1518-4 PN\/DP MFP	V3.1.5 ≤ 𝑥 < *	ADP

Debian Releases

Debian Product

Codename

linux

bookworm	6.1.170-3 fixed
bookworm (security)	6.1.174-1 fixed
bullseye	vulnerable
bullseye (security)	5.10.257-1 fixed
forky	7.0.9-1 fixed
sid	7.0.10-1 fixed
trixie	6.12.86-1 fixed
trixie (security)	6.12.90-2 fixed

linux-6.1

bullseye (security)

6.1.174-1~deb11u1

fixed

openSUSE / SLES Releases

openSUSE Product

Release

kernel-64kb

suse enterprise desktop 15 SP6	6.4.0-150600.23.42.2 fixed
suse enterprise desktop 15 SP7	6.4.0-150700.51.1 fixed
suse enterprise sap 15 SP6	6.4.0-150600.23.42.2 fixed
suse enterprise sap 15 SP7	6.4.0-150700.51.1 fixed
suse enterprise server 15 SP6	6.4.0-150600.23.42.2 fixed
suse enterprise server 15 SP7	6.4.0-150700.51.1 fixed

kernel-azure

suse enterprise sap 15 SP6	6.4.0-150600.8.31.1 fixed
suse enterprise server 15 SP6	6.4.0-150600.8.31.1 fixed

kernel-default

suse enterprise desktop 15 SP6	6.4.0-150600.23.42.2 fixed
suse enterprise desktop 15 SP7	6.4.0-150700.51.1 fixed
suse enterprise sap 15 SP6	6.4.0-150600.23.42.2 fixed
suse enterprise sap 15 SP7	6.4.0-150700.51.1 fixed
suse enterprise server 15 SP6	6.4.0-150600.23.42.2 fixed
suse enterprise server 15 SP7	6.4.0-150700.51.1 fixed

kernel-default-base

suse enterprise desktop 15 SP6	6.4.0-150600.23.42.2.150600.12.18.4 fixed
suse enterprise sap 15 SP6	6.4.0-150600.23.42.2.150600.12.18.4 fixed
suse enterprise server 15 SP6	6.4.0-150600.23.42.2.150600.12.18.4 fixed

kernel-docs

suse enterprise desktop 15 SP6	6.4.0-150600.23.42.1 fixed
suse enterprise desktop 15 SP7	6.4.0-150700.51.2 fixed
suse enterprise sap 15 SP6	6.4.0-150600.23.42.1 fixed
suse enterprise sap 15 SP7	6.4.0-150700.51.2 fixed
suse enterprise server 15 SP6	6.4.0-150600.23.42.1 fixed
suse enterprise server 15 SP7	6.4.0-150700.51.2 fixed

kernel-macros

suse enterprise desktop 15 SP6	6.4.0-150600.23.42.1 fixed
suse enterprise desktop 15 SP7	6.4.0-150700.51.1 fixed
suse enterprise sap 15 SP6	6.4.0-150600.23.42.1 fixed
suse enterprise sap 15 SP7	6.4.0-150700.51.1 fixed
suse enterprise server 15 SP6	6.4.0-150600.23.42.1 fixed
suse enterprise server 15 SP7	6.4.0-150700.51.1 fixed

kernel-obs-build

suse enterprise desktop 15 SP6	6.4.0-150600.23.42.2 fixed
suse enterprise desktop 15 SP7	6.4.0-150700.51.2 fixed
suse enterprise sap 15 SP6	6.4.0-150600.23.42.2 fixed
suse enterprise sap 15 SP7	6.4.0-150700.51.2 fixed
suse enterprise server 15 SP6	6.4.0-150600.23.42.2 fixed
suse enterprise server 15 SP7	6.4.0-150700.51.2 fixed

kernel-source

suse enterprise desktop 15 SP6	6.4.0-150600.23.42.1 fixed
suse enterprise desktop 15 SP7	6.4.0-150700.51.1 fixed
suse enterprise sap 15 SP6	6.4.0-150600.23.42.1 fixed
suse enterprise sap 15 SP7	6.4.0-150700.51.1 fixed
suse enterprise server 15 SP6	6.4.0-150600.23.42.1 fixed
suse enterprise server 15 SP7	6.4.0-150700.51.1 fixed

kernel-source-azure

suse enterprise sap 15 SP6	6.4.0-150600.8.31.1 fixed
suse enterprise server 15 SP6	6.4.0-150600.8.31.1 fixed

kernel-syms

suse enterprise desktop 15 SP6	6.4.0-150600.23.42.1 fixed
suse enterprise desktop 15 SP7	6.4.0-150700.51.1 fixed
suse enterprise sap 15 SP6	6.4.0-150600.23.42.1 fixed
suse enterprise sap 15 SP7	6.4.0-150700.51.1 fixed
suse enterprise server 15 SP6	6.4.0-150600.23.42.1 fixed
suse enterprise server 15 SP7	6.4.0-150700.51.1 fixed

kernel-syms-azure

suse enterprise sap 15 SP6	6.4.0-150600.8.31.1 fixed
suse enterprise server 15 SP6	6.4.0-150600.8.31.1 fixed

kernel-zfcpdump

suse enterprise desktop 15 SP6	6.4.0-150600.23.42.2 fixed
suse enterprise desktop 15 SP7	6.4.0-150700.51.1 fixed
suse enterprise sap 15 SP6	6.4.0-150600.23.42.2 fixed
suse enterprise sap 15 SP7	6.4.0-150700.51.1 fixed
suse enterprise server 15 SP6	6.4.0-150600.23.42.2 fixed
suse enterprise server 15 SP7	6.4.0-150700.51.1 fixed

Red Hat Enterprise Linux Releases

Red Hat Product

Release

kernel

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-64k

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-64k-core

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-64k-debug

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-64k-debug-core

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-64k-debug-devel

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-64k-debug-devel-matched

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-64k-debug-modules

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-64k-debug-modules-core

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-64k-debug-modules-extra

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-64k-devel

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-64k-devel-matched

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-64k-modules

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-64k-modules-core

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-64k-modules-extra

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-abi-stablelists

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-core

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-debug

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-debug-core

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-debug-devel

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-debug-devel-matched

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-debug-modules

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-debug-modules-core

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-debug-modules-extra

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-debug-uki-virt

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-devel

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-devel-matched

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-doc

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-modules

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-modules-core

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-modules-extra

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-rt

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-rt-64k

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-rt-64k-core

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-rt-64k-debug

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-rt-64k-debug-core

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-rt-64k-debug-devel

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-rt-64k-debug-modules

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-rt-64k-debug-modules-core

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-rt-64k-debug-modules-extra

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-rt-64k-devel

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-rt-64k-modules

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-rt-64k-modules-core

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-rt-64k-modules-extra

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-rt-core

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-rt-debug

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-rt-debug-core

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-rt-debug-devel

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-rt-debug-modules

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-rt-debug-modules-core

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-rt-debug-modules-extra

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-rt-devel

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-rt-modules

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-rt-modules-core

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-rt-modules-extra

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-tools

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-tools-libs

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-tools-libs-devel

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-uki-virt

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-uki-virt-addons

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-zfcpdump

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-zfcpdump-core

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-zfcpdump-devel

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-zfcpdump-devel-matched

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-zfcpdump-modules

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-zfcpdump-modules-core

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

kernel-zfcpdump-modules-extra

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

libperf

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

perf

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

python3-perf

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

rtla

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

RHEL 9

0:5.14.0-611.5.1.el9_7

fixed

References

https://git.kernel.org/stable/c/036ac2778f7b28885814c6fbc07e156ad1624d03

https://git.kernel.org/stable/c/23ad7797c74cd8f7f90617f1e59a8703e2b43908

https://git.kernel.org/stable/c/38d345f612503b850c2973e5a879f88e441b34d7

https://git.kernel.org/stable/c/abed68027ea3ab893ac85cc46a00e2e64a324239

https://git.kernel.org/stable/c/cedfbb92cf97a6bff3d25633001d9c44442ee854

https://git.kernel.org/stable/c/e88d2451cd42e025465d6b51fd716a47b0b3800d

https://git.kernel.org/stable/c/efa8a261c575f816c7e79a87aeb3ef8a0bd6b221

https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html

https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html

https://cert-portal.siemens.com/productcert/html/ssa-082556.html

https://cert-portal.siemens.com/productcert/html/ssa-265688.html