🛡️ UBUNTU-CVE-2025-21795
⚪ Unknown ✅ No Known Exploit OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

Details

Severity Unknown
CVSS Score N/A
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 OSV
Published 2025-02-27
Updated 2026-06-15
Modified 2026-06-08
Fix URL N/A

Affected Packages

Software From version Fixed in
linux 6.8.0-78.78
linux-allwinner-5.19
linux-aws 6.8.0-1035.37
linux-aws-5.0
linux-aws-5.11
linux-aws-5.13
linux-aws-5.15 5.15.0-1084.91~20.04.1
linux-aws-5.19
linux-aws-5.3
linux-aws-5.8
linux-aws-6.2
linux-aws-6.5
linux-aws-6.8 6.8.0-1035.37~22.04.1
linux-aws-fips 5.15.0-1084.91+fips1
linux-azure 6.8.0-1034.39
linux-azure-5.11
linux-azure-5.13
linux-azure-5.15 5.15.0-1089.98~20.04.1
linux-azure-5.19
linux-azure-5.3
linux-azure-5.8
linux-azure-6.11 6.11.0-1015.15~24.04.1
linux-azure-6.2
linux-azure-6.5
linux-azure-6.8 6.8.0-1034.39~22.04.1
linux-azure-edge
linux-azure-fde
linux-azure-fde-5.19
linux-azure-fde-6.2
linux-azure-fips 5.15.0-1089.98+fips1
linux-azure-nvidia 6.8.0-1022.23
linux-bluefield
linux-fips 6.8.0-78.78+fips1
linux-gcp 6.8.0-1036.38
linux-gcp-5.11
linux-gcp-5.13
linux-gcp-5.15 5.15.0-1083.92~20.04.1
linux-gcp-5.19
linux-gcp-5.3
linux-gcp-5.8
linux-gcp-6.11 6.11.0-1015.15~24.04.1
linux-gcp-6.2
linux-gcp-6.5
linux-gcp-6.8 6.8.0-1036.38~22.04.1
linux-gcp-fips 5.15.0-1083.92+fips1
linux-gke 6.8.0-1032.36
linux-gke-4.15
linux-gke-5.15
linux-gke-5.4
linux-gkeop 6.8.0-1019.21
linux-gkeop-5.15
linux-gkeop-5.4
linux-hwe
linux-hwe-5.11
linux-hwe-5.13
linux-hwe-5.15 5.15.0-142.152~20.04.1
linux-hwe-5.19
linux-hwe-5.8
linux-hwe-6.11 6.11.0-26.26~24.04.1
linux-hwe-6.2
linux-hwe-6.5
linux-hwe-6.8 6.8.0-78.78~22.04.1
linux-hwe-edge
linux-ibm 6.8.0-1033.33
linux-ibm-5.15 5.15.0-1076.79~20.04.1
linux-ibm-6.8 6.8.0-1033.33~22.04.1
linux-intel
linux-intel-5.13
linux-intel-iot-realtime 5.15.0-1077.79
linux-intel-iotg 5.15.0-1079.85
linux-intel-iotg-5.15 5.15.0-1079.85~20.04.1
linux-kvm 5.15.0-1080.85
linux-lowlatency 6.8.0-78.78.1
linux-lowlatency-hwe-5.15 5.15.0-140.150~20.04.1
linux-lowlatency-hwe-5.19
linux-lowlatency-hwe-6.11 6.11.0-1014.15~24.04.1
linux-lowlatency-hwe-6.2
linux-lowlatency-hwe-6.5
linux-lowlatency-hwe-6.8 6.8.0-78.78.1~22.04.1
linux-nvidia 6.8.0-1035.38
linux-nvidia-6.11 6.11.0-1010.10
linux-nvidia-6.2
linux-nvidia-6.5
linux-nvidia-6.8 6.8.0-1035.38~22.04.1
linux-nvidia-lowlatency 6.8.0-1035.38.1
linux-nvidia-tegra 6.8.0-1009.9
linux-nvidia-tegra-5.15 5.15.0-1039.39~20.04.1
linux-nvidia-tegra-igx 5.15.0-1026.26
linux-oem
linux-oem-5.10
linux-oem-5.13
linux-oem-5.14
linux-oem-5.17
linux-oem-5.6
linux-oem-6.0
linux-oem-6.1
linux-oem-6.11 6.11.0-1022.22
linux-oem-6.5
linux-oem-6.8
linux-oracle 6.8.0-1032.33
linux-oracle-5.0
linux-oracle-5.11
linux-oracle-5.13
linux-oracle-5.15 5.15.0-1081.87~20.04.1
linux-oracle-5.3
linux-oracle-5.8
linux-oracle-6.5
linux-oracle-6.8 6.8.0-1032.33~22.04.1
linux-raspi 6.8.0-1035.39
linux-raspi-realtime 6.8.0-2028.29
linux-raspi2
linux-realtime 6.8.1-1030.31
linux-realtime-6.8 6.8.1-1030.31~22.04.1
linux-riscv
linux-riscv-5.11
linux-riscv-5.15 5.15.0-1079.83~20.04.1
linux-riscv-5.19
linux-riscv-5.8
linux-riscv-6.5
linux-riscv-6.8 6.8.0-78.78~22.04.1
linux-starfive-5.19
linux-starfive-6.2
linux-starfive-6.5
linux-xilinx 6.8.0-1017.18
linux-xilinx-zynqmp 5.15.0-1050.54

References

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