Medium severity5.5NVD Advisory· Published Feb 27, 2025· Updated Jun 17, 2026

CVE-2025-21795

Description

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

142

Linux/Kernel5 versions
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*+ 4 more
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*range: >=5.10.220,<5.10.235
- cpe:2.3:o:linux:linux_kernel:6.14:rc1:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:6.14:rc2:*:*:*:*:*:*
- (no CPE)
- (no CPE)range: 5.19
osv-coords137 versions
pkg:deb/ubuntu/linux-aws@6.11.0-1014.15?arch=source&distro=oracular pkg:rpm/almalinux/kernel pkg:rpm/almalinux/kernel-64k pkg:rpm/almalinux/kernel-64k-core pkg:rpm/almalinux/kernel-64k-debug pkg:rpm/almalinux/kernel-64k-debug-core pkg:rpm/almalinux/kernel-64k-debug-devel pkg:rpm/almalinux/kernel-64k-debug-devel-matched pkg:rpm/almalinux/kernel-64k-debug-modules pkg:rpm/almalinux/kernel-64k-debug-modules-core pkg:rpm/almalinux/kernel-64k-debug-modules-extra pkg:rpm/almalinux/kernel-64k-devel pkg:rpm/almalinux/kernel-64k-devel-matched pkg:rpm/almalinux/kernel-64k-modules pkg:rpm/almalinux/kernel-64k-modules-core pkg:rpm/almalinux/kernel-64k-modules-extra pkg:rpm/almalinux/kernel-abi-stablelists pkg:rpm/almalinux/kernel-core pkg:rpm/almalinux/kernel-cross-headers pkg:rpm/almalinux/kernel-debug pkg:rpm/almalinux/kernel-debug-core pkg:rpm/almalinux/kernel-debug-devel pkg:rpm/almalinux/kernel-debug-devel-matched pkg:rpm/almalinux/kernel-debug-modules pkg:rpm/almalinux/kernel-debug-modules-core pkg:rpm/almalinux/kernel-debug-modules-extra pkg:rpm/almalinux/kernel-debug-uki-virt pkg:rpm/almalinux/kernel-devel pkg:rpm/almalinux/kernel-devel-matched pkg:rpm/almalinux/kernel-doc pkg:rpm/almalinux/kernel-headers pkg:rpm/almalinux/kernel-modules pkg:rpm/almalinux/kernel-modules-core pkg:rpm/almalinux/kernel-modules-extra pkg:rpm/almalinux/kernel-modules-extra-matched pkg:rpm/almalinux/kernel-rt pkg:rpm/almalinux/kernel-rt-64k pkg:rpm/almalinux/kernel-rt-64k-core pkg:rpm/almalinux/kernel-rt-64k-debug pkg:rpm/almalinux/kernel-rt-64k-debug-core pkg:rpm/almalinux/kernel-rt-64k-debug-devel pkg:rpm/almalinux/kernel-rt-64k-debug-modules pkg:rpm/almalinux/kernel-rt-64k-debug-modules-core pkg:rpm/almalinux/kernel-rt-64k-debug-modules-extra pkg:rpm/almalinux/kernel-rt-64k-devel pkg:rpm/almalinux/kernel-rt-64k-modules pkg:rpm/almalinux/kernel-rt-64k-modules-core pkg:rpm/almalinux/kernel-rt-64k-modules-extra pkg:rpm/almalinux/kernel-rt-core pkg:rpm/almalinux/kernel-rt-debug pkg:rpm/almalinux/kernel-rt-debug-core pkg:rpm/almalinux/kernel-rt-debug-devel pkg:rpm/almalinux/kernel-rt-debug-modules pkg:rpm/almalinux/kernel-rt-debug-modules-core pkg:rpm/almalinux/kernel-rt-debug-modules-extra pkg:rpm/almalinux/kernel-rt-devel pkg:rpm/almalinux/kernel-rt-modules pkg:rpm/almalinux/kernel-rt-modules-core pkg:rpm/almalinux/kernel-rt-modules-extra pkg:rpm/almalinux/kernel-tools pkg:rpm/almalinux/kernel-tools-libs pkg:rpm/almalinux/kernel-tools-libs-devel pkg:rpm/almalinux/kernel-uki-virt pkg:rpm/almalinux/kernel-uki-virt-addons pkg:rpm/almalinux/kernel-zfcpdump pkg:rpm/almalinux/kernel-zfcpdump-core pkg:rpm/almalinux/kernel-zfcpdump-devel pkg:rpm/almalinux/kernel-zfcpdump-devel-matched pkg:rpm/almalinux/kernel-zfcpdump-modules pkg:rpm/almalinux/kernel-zfcpdump-modules-core pkg:rpm/almalinux/kernel-zfcpdump-modules-extra pkg:rpm/almalinux/libperf pkg:rpm/almalinux/perf pkg:rpm/almalinux/python3-perf pkg:rpm/almalinux/rtla pkg:rpm/almalinux/rv pkg:rpm/opensuse/dtb-aarch64&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/kernel-64kb&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/kernel-azure&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/kernel-debug&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/kernel-default-base&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/kernel-default&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/kernel-docs&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/kernel-kvmsmall&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/kernel-obs-build&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/kernel-obs-qa&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/kernel-rt_debug&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/kernel-rt&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/kernel-source-azure&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/kernel-source&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/kernel-source-rt&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/kernel-syms-azure&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/kernel-syms&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/kernel-syms-rt&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/kernel-zfcpdump&distro=openSUSE%20Leap%2015.6 pkg:rpm/suse/kernel-64kb&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP6 pkg:rpm/suse/kernel-azure&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Public%20Cloud%2015%20SP6 pkg:rpm/suse/kernel-coco_debug&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Confidential%20Computing%20Technical%20Preview%2015%20SP6 pkg:rpm/suse/kernel-coco&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Confidential%20Computing%20Technical%20Preview%2015%20SP6 pkg:rpm/suse/kernel-default-base&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP6 pkg:rpm/suse/kernel-default-base&distro=SUSE%20Linux%20Micro%206.0 pkg:rpm/suse/kernel-default-base&distro=SUSE%20Linux%20Micro%206.1 pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20High%20Availability%20Extension%2015%20SP6 pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2015%20SP6 pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP6 pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Legacy%2015%20SP6 pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Workstation%20Extension%2015%20SP6 pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Micro%206.0 pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Micro%206.1 pkg:rpm/suse/kernel-docs&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP6 pkg:rpm/suse/kernel-kvmsmall&distro=SUSE%20Linux%20Micro%206.0 pkg:rpm/suse/kernel-kvmsmall&distro=SUSE%20Linux%20Micro%206.1 pkg:rpm/suse/kernel-livepatch-MICRO-6-0-RT_Update_6&distro=SUSE%20Linux%20Micro%206.0 pkg:rpm/suse/kernel-livepatch-MICRO-6-0-RT_Update_6&distro=SUSE%20Linux%20Micro%206.1 pkg:rpm/suse/kernel-livepatch-MICRO-6-0_Update_6&distro=SUSE%20Linux%20Micro%206.0 pkg:rpm/suse/kernel-livepatch-MICRO-6-0_Update_6&distro=SUSE%20Linux%20Micro%206.1 pkg:rpm/suse/kernel-livepatch-SLE15-SP6-RT_Update_9&distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2015%20SP6 pkg:rpm/suse/kernel-livepatch-SLE15-SP6_Update_9&distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2015%20SP6 pkg:rpm/suse/kernel-obs-build&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP6 pkg:rpm/suse/kernel-rt_debug&distro=SUSE%20Real%20Time%20Module%2015%20SP6 pkg:rpm/suse/kernel-rt&distro=SUSE%20Linux%20Micro%206.0 pkg:rpm/suse/kernel-rt&distro=SUSE%20Linux%20Micro%206.1 pkg:rpm/suse/kernel-rt&distro=SUSE%20Real%20Time%20Module%2015%20SP6 pkg:rpm/suse/kernel-source-azure&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Public%20Cloud%2015%20SP6 pkg:rpm/suse/kernel-source-coco&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Confidential%20Computing%20Technical%20Preview%2015%20SP6 pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP6 pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP6 pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Micro%206.0 pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Micro%206.1 pkg:rpm/suse/kernel-source-rt&distro=SUSE%20Linux%20Micro%206.0 pkg:rpm/suse/kernel-source-rt&distro=SUSE%20Linux%20Micro%206.1 pkg:rpm/suse/kernel-source-rt&distro=SUSE%20Real%20Time%20Module%2015%20SP6 pkg:rpm/suse/kernel-syms-azure&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Public%20Cloud%2015%20SP6 pkg:rpm/suse/kernel-syms-coco&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Confidential%20Computing%20Technical%20Preview%2015%20SP6 pkg:rpm/suse/kernel-syms&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP6 pkg:rpm/suse/kernel-syms-rt&distro=SUSE%20Real%20Time%20Module%2015%20SP6 pkg:rpm/suse/kernel-zfcpdump&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP6
< 6.11.0-1014.15+ 136 more
- (no CPE)range: < 6.11.0-1014.15
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.12.0-124.8.1.el10_1
- (no CPE)range: < 6.4.0-150600.23.42.1
- (no CPE)range: < 6.4.0-150600.23.42.2
- (no CPE)range: < 6.4.0-150600.8.31.1
- (no CPE)range: < 6.4.0-150600.23.42.2
- (no CPE)range: < 6.4.0-150600.23.42.2.150600.12.18.4
- (no CPE)range: < 6.4.0-150600.23.42.2
- (no CPE)range: < 6.4.0-150600.23.42.1
- (no CPE)range: < 6.4.0-150600.23.42.2
- (no CPE)range: < 6.4.0-150600.23.42.2
- (no CPE)range: < 6.4.0-150600.23.42.1
- (no CPE)range: < 6.4.0-150600.10.29.1
- (no CPE)range: < 6.4.0-150600.10.29.1
- (no CPE)range: < 6.4.0-150600.8.31.1
- (no CPE)range: < 6.4.0-150600.23.42.1
- (no CPE)range: < 6.4.0-150600.10.29.1
- (no CPE)range: < 6.4.0-150600.8.31.1
- (no CPE)range: < 6.4.0-150600.23.42.1
- (no CPE)range: < 6.4.0-150600.10.29.1
- (no CPE)range: < 6.4.0-150600.23.42.2
- (no CPE)range: < 6.4.0-150600.23.42.2
- (no CPE)range: < 6.4.0-150600.8.31.1
- (no CPE)range: < 6.4.0-15061.21.coco15sp6.1
- (no CPE)range: < 6.4.0-15061.21.coco15sp6.1
- (no CPE)range: < 6.4.0-150600.23.42.2.150600.12.18.4
- (no CPE)range: < 6.4.0-28.1.21.6
- (no CPE)range: < 6.4.0-28.1.21.6
- (no CPE)range: < 6.4.0-150600.23.42.2
- (no CPE)range: < 6.4.0-150600.23.42.2
- (no CPE)range: < 6.4.0-150600.23.42.2
- (no CPE)range: < 6.4.0-150600.23.42.2
- (no CPE)range: < 6.4.0-150600.23.42.2
- (no CPE)range: < 6.4.0-28.1
- (no CPE)range: < 6.4.0-28.1
- (no CPE)range: < 6.4.0-150600.23.42.1
- (no CPE)range: < 6.4.0-28.1
- (no CPE)range: < 6.4.0-28.1
- (no CPE)range: < 1-3.1
- (no CPE)range: < 1-3.1
- (no CPE)range: < 1-3.1
- (no CPE)range: < 1-3.1
- (no CPE)range: < 1-150600.1.3.2
- (no CPE)range: < 1-150600.13.3.4
- (no CPE)range: < 6.4.0-150600.23.42.2
- (no CPE)range: < 6.4.0-150600.10.29.1
- (no CPE)range: < 6.4.0-28.1
- (no CPE)range: < 6.4.0-28.1
- (no CPE)range: < 6.4.0-150600.10.29.1
- (no CPE)range: < 6.4.0-150600.8.31.1
- (no CPE)range: < 6.4.0-15061.21.coco15sp6.1
- (no CPE)range: < 6.4.0-150600.23.42.1
- (no CPE)range: < 6.4.0-150600.23.42.1
- (no CPE)range: < 6.4.0-28.1
- (no CPE)range: < 6.4.0-28.1
- (no CPE)range: < 6.4.0-28.1
- (no CPE)range: < 6.4.0-28.1
- (no CPE)range: < 6.4.0-150600.10.29.1
- (no CPE)range: < 6.4.0-150600.8.31.1
- (no CPE)range: < 6.4.0-15061.21.coco15sp6.1
- (no CPE)range: < 6.4.0-150600.23.42.1
- (no CPE)range: < 6.4.0-150600.10.29.1
- (no CPE)range: < 6.4.0-150600.23.42.2

cvss	0.358
epss	0.000
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000

CVE-2025-21795

Description

AI Insight

Affected products

Patches

Vulnerability mechanics

References

News mentions