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Critical · 9.8 CVE-2026-90104 EUVD-2026-81697GHSA-8hhg-gc4j-p2q8

NFSv4.1: zero referring call lists before decoding

Published Sep 17, 2026 · Updated Oct 30, 2026 · Assigned by Linux

Vendor: Linux Product: Linux Package: kernel Package: linux Package: linux Package: linux-allwinner-5.19 Package: linux-aws Package: linux-aws-5.0 Package: linux-aws-5.11 Package: linux-aws-5.13 Package: linux-aws-5.15 Package: linux-aws-5.19 Package: linux-aws-5.3 Package: linux-aws-5.4 Package: linux-aws-5.8 Package: linux-aws-6.14 Package: linux-aws-6.17 Package: linux-aws-6.2 Package: linux-aws-6.5 Package: linux-aws-6.8 Package: linux-aws-7.0 Package: linux-aws-fips Package: linux-aws-hwe Package: linux-azure Package: linux-azure-4.15 Package: linux-azure-5.11 Package: linux-azure-5.13 Package: linux-azure-5.15 Package: linux-azure-5.19 Package: linux-azure-5.3 Package: linux-azure-5.4 Package: linux-azure-5.8 Package: linux-azure-6.11 Package: linux-azure-6.14 Package: linux-azure-6.17 Package: linux-azure-6.2 Package: linux-azure-6.5 Package: linux-azure-6.8 Package: linux-azure-7.0 Package: linux-azure-edge Package: linux-azure-fde Package: linux-azure-fde-5.15 Package: linux-azure-fde-5.19 Package: linux-azure-fde-6.14 Package: linux-azure-fde-6.17 Package: linux-azure-fde-6.2 Package: linux-azure-fde-6.8 Package: linux-azure-fde-7.0 Package: linux-azure-fips Package: linux-azure-nvidia Package: linux-azure-nvidia-6.14 Package: linux-bluefield Package: linux-fips Package: linux-gcp Package: linux-gcp-4.15 Package: linux-gcp-5.11 Package: linux-gcp-5.13 Package: linux-gcp-5.15 Package: linux-gcp-5.19 Package: linux-gcp-5.3 Package: linux-gcp-5.4 Package: linux-gcp-5.8 Package: linux-gcp-6.11 Package: linux-gcp-6.14 Package: linux-gcp-6.17 Package: linux-gcp-6.2 Package: linux-gcp-6.5 Package: linux-gcp-6.8 Package: linux-gcp-7.0 Package: linux-gcp-fips Package: linux-gke Package: linux-gke-4.15 Package: linux-gke-5.15 Package: linux-gke-5.4 Package: linux-gkeop Package: linux-gkeop-5.15 Package: linux-gkeop-5.4 Package: linux-hwe Package: linux-hwe-5.11 Package: linux-hwe-5.13 Package: linux-hwe-5.15 Package: linux-hwe-5.19 Package: linux-hwe-5.4 Package: linux-hwe-5.8 Package: linux-hwe-6.11 Package: linux-hwe-6.14 Package: linux-hwe-6.17 Package: linux-hwe-6.2 Package: linux-hwe-6.5 Package: linux-hwe-6.8 Package: linux-hwe-7.0 Package: linux-hwe-edge Package: linux-ibm Package: linux-ibm-5.15 Package: linux-ibm-5.4 Package: linux-ibm-6.8 Package: linux-intel-5.13 Package: linux-intel-iot-realtime Package: linux-intel-iotg Package: linux-intel-iotg-5.15 Package: linux-iot Package: linux-kvm Package: linux-lowlatency Package: linux-lowlatency-hwe-5.15 Package: linux-lowlatency-hwe-5.19 Package: linux-lowlatency-hwe-6.11 Package: linux-lowlatency-hwe-6.2 Package: linux-lowlatency-hwe-6.5 Package: linux-lowlatency-hwe-6.8 Package: linux-lts-xenial Package: linux-nvidia Package: linux-nvidia-6.11 Package: linux-nvidia-6.17 Package: linux-nvidia-6.2 Package: linux-nvidia-6.5 Package: linux-nvidia-6.8 Package: linux-nvidia-7.0 Package: linux-nvidia-bos Package: linux-nvidia-lowlatency Package: linux-nvidia-tegra Package: linux-nvidia-tegra-5.15 Package: linux-nvidia-tegra-igx Package: linux-oem Package: linux-oem-5.10 Package: linux-oem-5.13 Package: linux-oem-5.14 Package: linux-oem-5.17 Package: linux-oem-5.6 Package: linux-oem-6.0 Package: linux-oem-6.1 Package: linux-oem-6.11 Package: linux-oem-6.14 Package: linux-oem-6.17 Package: linux-oem-6.5 Package: linux-oem-6.8 Package: linux-oem-7.0 Package: linux-oracle Package: linux-oracle-5.0 Package: linux-oracle-5.11 Package: linux-oracle-5.13 Package: linux-oracle-5.15 Package: linux-oracle-5.3 Package: linux-oracle-5.4 Package: linux-oracle-5.8 Package: linux-oracle-6.14 Package: linux-oracle-6.17 Package: linux-oracle-6.5 Package: linux-oracle-6.8 Package: linux-oracle-7.0 Package: linux-raspi Package: linux-raspi-5.4 Package: linux-raspi-realtime Package: linux-raspi2 Package: linux-realtime Package: linux-realtime-6.14 Package: linux-realtime-6.17 Package: linux-realtime-6.8 Package: linux-riscv Package: linux-riscv-5.11 Package: linux-riscv-5.15 Package: linux-riscv-5.19 Package: linux-riscv-5.8 Package: linux-riscv-6.14 Package: linux-riscv-6.17 Package: linux-riscv-6.5 Package: linux-riscv-6.8 Package: linux-riscv-7.0 Package: linux-starfive-5.19 Package: linux-starfive-6.2 Package: linux-starfive-6.5 Package: linux-vmware Package: linux-xilinx Package: linux-xilinx-zynqmp Platform: Linux Ecosystem: Azure Linux Ecosystem: Debian Ecosystem: Ubuntu

Description

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

NFSv4.1: zero referring call lists before decoding

decode_cb_sequence_args() allocates csa_rclists with kmalloc_objs(), so
each referring_call_list starts uninitialized. decode_rc_list() assigns
rcl_refcalls only when rcl_nrefcalls is nonzero. A valid list with zero
referring calls therefore leaves the pointer uninitialized, and
nfs4_callback_sequence() later passes stale slab contents to kfree().

Allocate csa_rclists with kzalloc_objs() so every rcl_refcalls member is
NULL from the beginning, including valid empty referring call lists.

Affected products

VendorProductAffectedFixed
Linux Linux 2.6.31 6.1.191

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

Debian

Security tracker ↗
ReleasePackageFixed inAdvisory
Debian 14 linux 7.2.6-1 —
Debian 13 linux 6.12.115-2 —
Debian 12 linux No fix yet —

Ubuntu

Security tracker ↗
ReleasePackageFixed inAdvisory
Ubuntu Nvidia-BlueField 24.04 LTS linux-bluefield No fix yet —
Ubuntu Nvidia-BlueField 22.04 LTS linux-bluefield No fix yet —
Ubuntu 26.04 LTS linux 7.0.0-42.42 USN-8959-1
Ubuntu 26.04 LTS linux-aws 7.0.0-1016.17 USN-8959-1
Ubuntu 26.04 LTS linux-azure 7.0.0-1020.21 USN-9019-1
Ubuntu 26.04 LTS linux-azure-fde 7.0.0-1019.19 USN-9020-1
Ubuntu 26.04 LTS linux-gcp 7.0.0-1016.18 USN-8959-1
Ubuntu 26.04 LTS linux-gke 7.0.0-1010.11 USN-9020-1
Ubuntu 26.04 LTS linux-ibm +1 7.0.0-1017.17 USN-8960-1, USN-8959-1
Ubuntu 26.04 LTS linux-nvidia +1 No fix yet —
Ubuntu 26.04 LTS linux-oracle 7.0.0-1015.16 USN-8959-1
Ubuntu 26.04 LTS linux-raspi 7.0.0-1023.23 USN-9021-1
Ubuntu 26.04 LTS linux-realtime 7.0.0-43.43.1 USN-9020-1
Ubuntu 26.04 LTS linux-riscv 7.0.0-42.42.1 —
Ubuntu 24.04 LTS linux +46 No fix yet —
Ubuntu 24.04 LTS linux-aws-7.0 7.0.0-1017.18~24.04.1 USN-9020-1
Ubuntu 24.04 LTS linux-azure-fde-7.0 7.0.0-1019.19~24.04.1 USN-9020-1
Ubuntu 24.04 LTS linux-gcp-7.0 7.0.0-1017.19~24.04.1 USN-9020-1
Ubuntu 24.04 LTS linux-hwe-7.0 7.0.0-42.42~24.04.1 USN-8959-1
Ubuntu 24.04 LTS linux-oracle-7.0 7.0.0-1016.18~24.04.1 USN-9020-1
Ubuntu 24.04 LTS linux-riscv-7.0 7.0.0-42.42.1~24.04.1 —
Ubuntu 22.04 LTS linux +59 No fix yet —
Show 18 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Ubuntu 20.04 LTS linux-gke +28 No fix yet —
Ubuntu 18.04 LTS linux-gcp +14 No fix yet —
Ubuntu 16.04 LTS linux-hwe-edge No fix yet —
Ubuntu Pro Realtime 24.04 LTS linux-realtime +3 No fix yet —
Ubuntu Pro Realtime 22.04 LTS linux-realtime +2 No fix yet —
Ubuntu Pro FIPS 20.04 LTS linux-fips +3 No fix yet —
Ubuntu Pro FIPS 18.04 LTS linux-fips +3 No fix yet —
Ubuntu Pro FIPS 16.04 LTS linux-fips No fix yet —
Ubuntu Pro FIPS-updates 24.04 LTS linux-fips +3 No fix yet —
Ubuntu Pro FIPS-updates 22.04 LTS linux-fips +3 No fix yet —
Ubuntu Pro FIPS-updates 20.04 LTS linux-fips +3 No fix yet —
Ubuntu Pro FIPS-updates 18.04 LTS linux-fips +3 No fix yet —
Ubuntu Pro FIPS-updates 16.04 LTS linux-fips No fix yet —
Ubuntu Pro FIPS-preview 22.04 LTS linux-fips +3 No fix yet —
Ubuntu Pro 20.04 LTS linux +21 No fix yet —
Ubuntu Pro 18.04 LTS linux +12 No fix yet —
Ubuntu Pro 16.04 LTS linux +7 No fix yet —
Ubuntu Pro 14.04 LTS linux +3 No fix yet —

SUSE

Security tracker ↗
ReleasePackageFixed inAdvisory
SLES 15 SP7 kernel-64kb +7 6.4.0-150700.53.84.1 SUSE-SU-2026:4706-1
SLES 15 SP7 kernel-default-base 6.4.0-150700.53.84.1.150700.17.47.1 SUSE-SU-2026:4706-1
SLES 15 SP6 kernel-64kb +6 6.4.0-150600.23.138.1 SUSE-SU-2026:4660-1
SLES 15 SP6 kernel-default-base 6.4.0-150600.23.138.1.150600.12.64.1 SUSE-SU-2026:4660-1
SLES 15 SP5 kernel-64kb +4 5.14.21-150500.55.192.2 SUSE-SU-2026:4667-1
SLES 15 SP5 kernel-default-base 5.14.21-150500.55.192.2.150500.6.89.2 SUSE-SU-2026:4667-1
SLES 15 SP5 kernel-docs +1 5.14.21-150500.55.192.1 SUSE-SU-2026:4667-1
SLES 15 SP4 kernel-64kb +6 5.14.21-150400.24.243.1 SUSE-SU-2026:4668-1
SLES 15 SP4 kernel-default-base 5.14.21-150400.24.243.1.150400.24.122.1 SUSE-SU-2026:4668-1
SLES 12 SP5 kernel-syms +2 4.12.14-122.333.2 SUSE-SU-2026:4687-1
Show 20 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
SLES 11 SP4 kernel-ec2 +6 3.0.101-108.223.1 SUSE-SU-2026:4639-1
SLES for SAP 16.0 kernel-64kb +8 6.12.0-160000.39.1 SUSE-SU-2026:24235-1
SLES for SAP 16.0 kernel-default-base 6.12.0-160000.39.1.160000.2.26 SUSE-SU-2026:24235-1
SLES for SAP 15 SP6 kernel-default-base 6.4.0-150600.23.138.1.150600.12.64.1 SUSE-SU-2026:4660-1
SLES for SAP 15 SP6 kernel-docs +4 6.4.0-150600.23.138.1 SUSE-SU-2026:4660-1
SLES for SAP 15 SP5 kernel-default-base 5.14.21-150500.55.192.2.150500.6.89.2 SUSE-SU-2026:4667-1
SLES for SAP 15 SP5 kernel-docs +1 5.14.21-150500.55.192.1 SUSE-SU-2026:4667-1
SLES for SAP 15 SP5 kernel-source +2 5.14.21-150500.55.192.2 SUSE-SU-2026:4667-1
SLES for SAP 15 SP4 kernel-default-base 5.14.21-150400.24.243.1.150400.24.122.1 SUSE-SU-2026:4668-1
SLES for SAP 15 SP4 kernel-docs +4 5.14.21-150400.24.243.1 SUSE-SU-2026:4668-1
SLES 16.0 kernel-64kb +8 6.12.0-160000.39.1 SUSE-SU-2026:24235-1, SUSE-SU-2026:24197-1
SLES 16.0 kernel-default-base 6.12.0-160000.39.1.160000.2.26 SUSE-SU-2026:24235-1
SLE Micro 6.2 kernel-default-base 6.12.0-160000.39.1.160000.2.26 SUSE-SU-2026:24184-1
SLE Micro 6.2 kernel-rt +5 6.12.0-160000.39.1 SUSE-SU-2026:24184-1, SUSE-SU-2026:24179-1
SLE Micro 6.2 podman 5.4.2-160000.6.1 SUSE-SU-2026:24182-1
SLE Micro 6.1 kernel-default-base 6.4.0-159998.53.1.159998.21.38 SUSE-SU-2026:24181-1
SLE Micro 6.1 kernel-rt +4 6.4.0-159998.53.1 SUSE-SU-2026:24182-1, SUSE-SU-2026:24181-1
SLE Micro 6.0 kernel-default-base 6.4.0-159998.53.1.159998.21.38 SUSE-SU-2026:24315-1
SLE Micro 6.0 kernel-rt +4 6.4.0-159998.53.1 SUSE-SU-2026:24316-1, SUSE-SU-2026:24315-1
SLE Micro 5.5 kernel-default-base 5.14.21-150500.55.192.2.150500.6.89.2 SUSE-SU-2026:4667-1
SLE Micro 5.5 kernel-rt +1 5.14.21-150500.13.164.1 SUSE-SU-2026:4665-1
SLE Micro 5.5 kernel-source +1 5.14.21-150500.55.192.2 SUSE-SU-2026:4667-1
SLE Micro 5.4 kernel-default-base 5.14.21-150400.24.243.1.150400.24.122.1 SUSE-SU-2026:4668-1
SLE Micro 5.4 kernel-rt +1 5.14.21-150400.15.189.1 SUSE-SU-2026:4666-1
SLE Micro 5.4 kernel-source +1 5.14.21-150400.24.243.1 SUSE-SU-2026:4668-1
SLE Micro 5.3 kernel-default-base 5.14.21-150400.24.243.1.150400.24.122.1 SUSE-SU-2026:4668-1
SLE Micro 5.3 kernel-rt +1 5.14.21-150400.15.189.1 SUSE-SU-2026:4666-1
SLE Micro 5.3 kernel-source +1 5.14.21-150400.24.243.1 SUSE-SU-2026:4668-1
SLE Live Patching 15 SP7 kernel-default 6.4.0-150700.53.84.1 SUSE-SU-2026:4706-1
SLE Live Patching 15 SP7 kernel-livepatch-SLE15-SP7-RT_Update_21 1-150700.1.3.1 SUSE-SU-2026:4640-1
SLE Live Patching 15 SP7 kernel-livepatch-SLE15-SP7_Update_22 1-150700.15.3.1 SUSE-SU-2026:4706-1
SLE Live Patching 15 SP6 kernel-default 6.4.0-150600.23.138.1 SUSE-SU-2026:4660-1
SLE Live Patching 15 SP6 kernel-livepatch-SLE15-SP6_Update_32 1-150600.13.3.1 SUSE-SU-2026:4660-1
SLE Live Patching 15 SP5 kernel-default 5.14.21-150500.55.192.2 SUSE-SU-2026:4667-1
SLE Live Patching 15 SP5 kernel-livepatch-SLE15-SP5_Update_46 1-150500.11.3.2 SUSE-SU-2026:4667-1
SLE Live Patching 15 SP4 kernel-default 5.14.21-150400.24.243.1 SUSE-SU-2026:4668-1
SLE Live Patching 15 SP4 kernel-livepatch-SLE15-SP4_Update_60 1-150400.9.3.1 SUSE-SU-2026:4668-1
SLE Live Patching 12 SP5 kernel-default 4.12.14-122.333.2 SUSE-SU-2026:4687-1
SLE Live Patching 12 SP5 kgraft-patch-SLE12-SP5_Update_88 1-8.3.3 SUSE-SU-2026:4687-1
SLE HPC 15 SP5 kernel-64kb +3 5.14.21-150500.55.192.2 SUSE-SU-2026:4667-1
SLE HPC 15 SP5 kernel-default-base 5.14.21-150500.55.192.2.150500.6.89.2 SUSE-SU-2026:4667-1
SLE HPC 15 SP5 kernel-docs +1 5.14.21-150500.55.192.1 SUSE-SU-2026:4667-1
SLE HPC 15 SP4 kernel-64kb +5 5.14.21-150400.24.243.1 SUSE-SU-2026:4668-1
SLE HPC 15 SP4 kernel-default-base 5.14.21-150400.24.243.1.150400.24.122.1 SUSE-SU-2026:4668-1
SUSE Real Time Module 15 SP7 kernel-rt +2 6.4.0-150700.7.78.1 SUSE-SU-2026:4640-1

openSUSE

Security tracker ↗
ReleasePackageFixed inAdvisory
openSUSE Tumbleweed kernel-source 7.2.7-1.1 openSUSE-SU-2026:11880-1
openSUSE Leap 16.0 kernel-default-base 6.12.0-160000.39.1.160000.2.25 openSUSE-SU-2026:22091-1
openSUSE Leap 16.0 kernel-rt +11 6.12.0-160000.39.1 openSUSE-SU-2026:22091-1

Amazon Linux

ReleasePackageFixed inAdvisory
Amazon Linux 2023 kernel-livepatch-6.12.114-139.210 1:1.0-0.amzn2023 ALAS2023-2026-3402
Amazon Linux 2023 perf6.12 +11 1:6.12.114-139.210.amzn2023 ALAS2023-2026-3402

Azure Linux

ReleasePackageFixed inAdvisory
Azure Linux 3 kernel 6.6.161.1-1 —

Advisories 26

References