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High · 7.5 CVE-2026-22998 EUVD-2026-4629GHSA-xjx5-8v38-q6gh

nvme-tcp: fix NULL pointer dereferences in nvmet_tcp_build_pdu_iovec

Published Jan 25, 2026 · Updated Oct 19, 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-fips Package: linux-azure 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-edge Package: linux-azure-fde Package: linux-azure-fde-5.19 Package: linux-azure-fde-6.14 Package: linux-azure-fde-6.2 Package: linux-azure-fde-6.8 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-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-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-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-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-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-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-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-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:

nvme-tcp: fix NULL pointer dereferences in nvmet_tcp_build_pdu_iovec

Commit efa56305908b ("nvmet-tcp: Fix a kernel panic when host sends an invalid H2C PDU length")
added ttag bounds checking and data_offset
validation in nvmet_tcp_handle_h2c_data_pdu(), but it did not validate
whether the command's data structures (cmd->req.sg and cmd->iov) have
been properly initialized before processing H2C_DATA PDUs.

The nvmet_tcp_build_pdu_iovec() function dereferences these pointers
without NULL checks. This can be triggered by sending H2C_DATA PDU
immediately after the ICREQ/ICRESP handshake, before
sending a CONNECT command or NVMe write command.

Attack vectors that trigger NULL pointer dereferences:
1. H2C_DATA PDU sent before CONNECT → both pointers NULL
2. H2C_DATA PDU for READ command → cmd->req.sg allocated, cmd->iov NULL
3. H2C_DATA PDU for uninitialized command slot → both pointers NULL

The fix validates both cmd->req.sg and cmd->iov before calling
nvmet_tcp_build_pdu_iovec(). Both checks are required because:
- Uninitialized commands: both NULL
- READ commands: cmd->req.sg allocated, cmd->iov NULL
- WRITE commands: both allocated

Affected products

VendorProductAffectedFixed
Linux Linux 5.10.209 – < 5.10.249, 5.15.148 – < 5.15.199, 6.1.75 – < 6.1.162, 6.6.14 – < 6.6.122, 5.4.268 – < 5.5, 6.7.2 – < 6.8, 6.8 5.10.249

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.

ReleasePackageFixed inAdvisory
Debian 14 linux 6.18.8-1 —
Debian 13 linux 6.12.69-1 DSA-6126-1
Debian 12 linux 6.1.162-1 DSA-6127-1
Debian 11 linux 5.10.249-1 DLA-4475-1
Debian 11 linux-6.1 6.1.162-1~deb11u1 DLA-4476-1
ReleasePackageFixed inAdvisory
Ubuntu Nvidia-BlueField 24.04 LTS linux-bluefield 6.8.0-1022.26 —
Ubuntu Nvidia-BlueField 22.04 LTS linux-bluefield 5.15.0-1089.91 —
Ubuntu 25.10 linux +8 No fix yet —
Ubuntu 24.04 LTS linux 6.8.0-117.117 USN-8278-1
Ubuntu 24.04 LTS linux-aws 6.8.0-1055.58 USN-8278-1
Ubuntu 24.04 LTS linux-azure 6.8.0-1056.62 USN-8278-2
Ubuntu 24.04 LTS linux-azure-6.17 6.17.0-1021.21~24.04.1 USN-8604-1
Ubuntu 24.04 LTS linux-azure-fde 6.8.0-1058.65 —
Ubuntu 24.04 LTS linux-azure-fde-6.17 6.17.0-1018.18~24.04.1 USN-8605-1
Ubuntu 24.04 LTS linux-azure-nvidia 6.8.0-1039.42 —
Ubuntu 24.04 LTS linux-gcp 6.8.0-1058.61 USN-8278-1
Ubuntu 24.04 LTS linux-gcp-6.17 6.17.0-1021.24~24.04.1 USN-8570-1
Ubuntu 24.04 LTS linux-gke 6.8.0-1054.60 USN-8278-1
Ubuntu 24.04 LTS linux-gkeop 6.8.0-1041.44 USN-8278-1
Ubuntu 24.04 LTS linux-hwe-6.17 6.17.0-41.41~24.04.1 —
Ubuntu 24.04 LTS linux-ibm 6.8.0-1055.56 USN-8278-1
Ubuntu 24.04 LTS linux-lowlatency 6.8.0-117.117.1 USN-8278-1
Ubuntu 24.04 LTS linux-nvidia 6.8.0-1054.57 USN-8289-1
Ubuntu 24.04 LTS linux-nvidia-6.17 6.17.0-1031.31 USN-8669-1
Ubuntu 24.04 LTS linux-nvidia-lowlatency 6.8.0-1054.57.1 USN-8289-1
Ubuntu 24.04 LTS linux-nvidia-tegra 6.8.0-1024.24 USN-8296-2
Ubuntu 24.04 LTS linux-oem-6.17 6.17.0-1030.30 USN-8594-1
Ubuntu 24.04 LTS linux-oracle 6.8.0-1054.55 —
Ubuntu 24.04 LTS linux-oracle-6.17 6.17.0-1019.19~24.04.3 USN-8570-2
Ubuntu 24.04 LTS linux-raspi 6.8.0-1056.60 USN-8278-1
Ubuntu 24.04 LTS linux-riscv +20 No fix yet —
Ubuntu 24.04 LTS linux-xilinx 6.8.0-1032.33 USN-8499-1
Ubuntu 22.04 LTS linux 5.15.0-176.186 USN-8180-1
Ubuntu 22.04 LTS linux-aws 5.15.0-1105.112 USN-8180-1
Ubuntu 22.04 LTS linux-aws-6.8 6.8.0-1057.60~22.04.1 —
Ubuntu 22.04 LTS linux-azure 5.15.0-1110.119 USN-8180-3
Ubuntu 22.04 LTS linux-azure-6.8 6.8.0-1059.65~22.04.1 USN-8440-1
Ubuntu 22.04 LTS linux-azure-fde 5.15.0-1114.123 —
Ubuntu 22.04 LTS linux-azure-fde-6.8 6.8.0-1058.65~22.04.1 —
Ubuntu 22.04 LTS linux-gcp 5.15.0-1105.114 USN-8180-1
Ubuntu 22.04 LTS linux-gcp-6.8 6.8.0-1060.63~22.04.1 —
Ubuntu 22.04 LTS linux-gke 5.15.0-1101.107 USN-8180-1
Ubuntu 22.04 LTS linux-gkeop 5.15.0-1088.96 USN-8180-1
Ubuntu 22.04 LTS linux-hwe-6.8 6.8.0-124.124~22.04.1 —
Ubuntu 22.04 LTS linux-ibm +1 5.15.0-1099.102 USN-8180-6, USN-8180-5
Ubuntu 22.04 LTS linux-ibm-6.8 6.8.0-1055.56~22.04.1 USN-8278-1
Ubuntu 22.04 LTS linux-intel-iotg 5.15.0-1100.106 USN-8180-3
Ubuntu 22.04 LTS linux-kvm 5.15.0-1097.102 USN-8180-3
Ubuntu 22.04 LTS linux-lowlatency 5.15.0-175.185 USN-8180-1
Ubuntu 22.04 LTS linux-lowlatency-hwe-6.8 6.8.0-117.117.1~22.04.1 USN-8278-1
Ubuntu 22.04 LTS linux-nvidia 5.15.0-1100.101 USN-8180-1
Ubuntu 22.04 LTS linux-nvidia-6.8 6.8.0-1054.57~22.04.1 USN-8289-2
Ubuntu 22.04 LTS linux-nvidia-tegra 5.15.0-1057.57 USN-8187-1
Ubuntu 22.04 LTS linux-nvidia-tegra-igx 5.15.0-1046.46 USN-8187-1
Ubuntu 22.04 LTS linux-oracle 5.15.0-1102.108 USN-8180-1
Ubuntu 22.04 LTS linux-oracle-6.8 6.8.0-1054.55~22.04.1 —
Ubuntu 22.04 LTS linux-riscv +32 No fix yet —
Ubuntu 22.04 LTS linux-riscv-6.8 6.8.0-117.117~22.04.1 —
Ubuntu 22.04 LTS linux-xilinx-zynqmp 5.15.0-1070.74 USN-8275-1
Show 10 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-raspi-realtime 6.8.0-2045.46 USN-8278-1
Ubuntu Pro Realtime 24.04 LTS linux-realtime 6.8.1-1051.52 USN-8278-1
Ubuntu Pro Realtime 24.04 LTS linux-realtime-6.14 No fix yet —
Ubuntu Pro Realtime 24.04 LTS linux-realtime-6.17 6.17.0-1018.20~24.04.1 USN-8570-1
Ubuntu Pro Realtime 22.04 LTS linux-intel-iot-realtime 5.15.0-1097.99 USN-8186-1
Ubuntu Pro Realtime 22.04 LTS linux-realtime 5.15.0-1104.113 USN-8186-1
Ubuntu Pro Realtime 22.04 LTS linux-realtime-6.8 6.8.1-1051.52~22.04.1 USN-8278-1
Ubuntu Pro FIPS-updates 24.04 LTS linux-aws-fips 6.8.0-1055.58+fips1 USN-8278-1
Ubuntu Pro FIPS-updates 24.04 LTS linux-azure-fips 6.8.0-1059.65+fips1 USN-8393-1
Ubuntu Pro FIPS-updates 24.04 LTS linux-fips 6.8.0-116.116+fips1 USN-8296-1
Ubuntu Pro FIPS-updates 24.04 LTS linux-gcp-fips 6.8.0-1058.61+fips1 USN-8278-1
Ubuntu Pro FIPS-updates 22.04 LTS linux-aws-fips 5.15.0-1105.112+fips1 —
Ubuntu Pro FIPS-updates 22.04 LTS linux-azure-fips 5.15.0-1110.119+fips1 USN-8180-4
Ubuntu Pro FIPS-updates 22.04 LTS linux-fips 5.15.0-176.186+fips1 USN-8180-2
Ubuntu Pro FIPS-updates 22.04 LTS linux-gcp-fips 5.15.0-1105.114+fips1 USN-8180-2
Ubuntu Pro FIPS-updates 20.04 LTS linux-fips +3 No fix yet —
Ubuntu Pro 20.04 LTS linux +10 No fix yet —
Ubuntu Pro 20.04 LTS linux-aws-5.15 5.15.0-1105.112~20.04.1 USN-8180-1
Ubuntu Pro 20.04 LTS linux-azure-5.15 5.15.0-1110.119~20.04.1 USN-8243-1
Ubuntu Pro 20.04 LTS linux-gcp-5.15 5.15.0-1106.115~20.04.1 USN-8297-1
Ubuntu Pro 20.04 LTS linux-hwe-5.15 5.15.0-176.186~20.04.1 USN-8188-1
Ubuntu Pro 20.04 LTS linux-ibm-5.15 5.15.0-1099.102~20.04.1 USN-8180-5
Ubuntu Pro 20.04 LTS linux-intel-iotg-5.15 5.15.0-1100.106~20.04.1 USN-8180-3
Ubuntu Pro 20.04 LTS linux-lowlatency-hwe-5.15 5.15.0-175.185~20.04.1 USN-8180-1
Ubuntu Pro 20.04 LTS linux-nvidia-tegra-5.15 5.15.0-1057.57~20.04.1 USN-8162-1
Ubuntu Pro 20.04 LTS linux-oracle-5.15 5.15.0-1102.108~20.04.1 USN-8180-3
Ubuntu Pro 20.04 LTS linux-riscv-5.15 5.15.0-1099.103~20.04.1 —
Ubuntu Pro 18.04 LTS linux-aws-5.4 +6 No fix yet —
ReleasePackageFixed inAdvisory
RHEL 10 rv +76 6.12.0-124.38.1.el10_1 RHSA-2026:2721
RHEL 9 rv +75 5.14.0-611.34.1.el9_7 RHSA-2026:2722
RHEL 8 kernel-rt +12 4.18.0-553.104.1.rt7.445.el8_10 RHSA-2026:2378
RHEL 8 perf +26 4.18.0-553.104.1.el8_10 RHSA-2026:2264

AlmaLinux

Errata ↗
ReleasePackageFixed inAdvisory
AlmaLinux 10 kernel-doc +1 6.12.0-124.38.1.el10_1 ALSA-2026:2721
AlmaLinux 9 rv +73 5.14.0-611.34.1.el9_7 ALSA-2026:2722
AlmaLinux 8 kernel-rt +9 4.18.0-553.104.1.rt7.445.el8_10 ALSA-2026:2378
AlmaLinux 8 perf +24 4.18.0-553.104.1.el8_10 ALSA-2026:2264

Rocky Linux

Errata ↗
ReleasePackageFixed inAdvisory
Rocky Linux 10 kernel 6.12.0-124.38.1.el10_1 RLSA-2026:2721
Rocky Linux 9 kernel 5.14.0-611.34.1.el9_7 RLSA-2026:2722
Rocky Linux 8 kernel 4.18.0-553.104.1.el8_10 RLSA-2026:2264
ReleasePackageFixed inAdvisory
SLES 15 SP7 kernel-64kb +7 6.4.0-150700.53.34.1 SUSE-SU-2026:1081-1
SLES 15 SP7 kernel-default-base 6.4.0-150700.53.34.1.150700.17.23.1 SUSE-SU-2026:1081-1
SLES 12 SP5 kernel-syms +2 4.12.14-122.296.1 SUSE-SU-2026:1078-1
Show 8 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
SLES for SAP 16.0 kernel-64kb +8 6.12.0-160000.27.1 SUSE-SU-2026:20931-1
SLES for SAP 16.0 kernel-default-base 6.12.0-160000.27.1.160000.2.8 SUSE-SU-2026:20931-1
SLES 16.0 kernel-64kb +8 6.12.0-160000.27.1 SUSE-SU-2026:20931-1
SLES 16.0 kernel-default-base 6.12.0-160000.27.1.160000.2.8 SUSE-SU-2026:20931-1
SLE Micro 6.2 kernel-default-base 6.12.0-160000.27.1.160000.2.8 SUSE-SU-2026:20838-1
SLE Micro 6.2 kernel-rt +5 6.12.0-160000.27.1 SUSE-SU-2026:20873-1, SUSE-SU-2026:20838-1
SLE Micro 6.1 kernel-default-base 6.4.0-40.1.21.17 SUSE-SU-2026:20667-1
SLE Micro 6.1 kernel-rt +4 6.4.0-40.1 SUSE-SU-2026:20876-1, SUSE-SU-2026:20667-1
SLE Micro 6.0 kernel-default-base 6.4.0-40.1.21.17 SUSE-SU-2026:20720-1
SLE Micro 6.0 kernel-rt +4 6.4.0-40.1 SUSE-SU-2026:20845-1, SUSE-SU-2026:20720-1
SLE Live Patching 15 SP7 kernel-default 6.4.0-150700.53.34.1 SUSE-SU-2026:1081-1
SLE Live Patching 15 SP7 kernel-livepatch-SLE15-SP7-RT_Update_10 1-150700.1.3.1 SUSE-SU-2026:0962-1
SLE Live Patching 15 SP7 kernel-livepatch-SLE15-SP7_Update_10 1-150700.15.3.1 SUSE-SU-2026:1081-1
SLE Live Patching 12 SP5 kernel-default 4.12.14-122.296.1 SUSE-SU-2026:1078-1
SLE Live Patching 12 SP5 kgraft-patch-SLE12-SP5_Update_78 1-8.3.1 SUSE-SU-2026:1078-1
SUSE Real Time Module 15 SP7 kernel-rt +2 6.4.0-150700.7.34.1 SUSE-SU-2026:0962-1
ReleasePackageFixed inAdvisory
openSUSE Leap 16.0 kernel-default-base 6.12.0-160000.27.1.160000.2.8 openSUSE-SU-2026:20416-1
openSUSE Leap 16.0 kernel-rt +11 6.12.0-160000.27.1 openSUSE-SU-2026:20416-1

Azure Linux

ReleasePackageFixed inAdvisory
Azure Linux 3 kernel 6.6.126.1-1 —
Azure Linux 2 (CBL-Mariner) kernel 5.15.200.1-1 —

Oracle Linux

ReleasePackageFixed inAdvisory
Oracle Linux 10 rv +29 6.12.0-124.38.1.el10_1 ELSA-2026-2721
Oracle Linux 9 kernel-uek +34 6.12.0-109.67.6.el10uek ELSA-2026-50144
Oracle Linux 9 rv +28 5.14.0-611.34.1.el9_7 ELSA-2026-2722
Oracle Linux 8 kernel-uek +17 5.15.0-318.199.3.2.el9uek ELSA-2026-50145
Oracle Linux 8 perf +19 4.18.0-553.104.1.el8_10 ELSA-2026-50145, ELSA-2026-2264

Advisories 50

References