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Fencer Vulns
high 7.5

CVE-2026-22998 json

nvme-tcp: fix NULL pointer dereferences in nvmet_tcp_build_pdu_iovec

published 2026-01-25 9 mo ago modified 2026-10-19 20 d ago also EUVD-2026-4629

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.8%
EPSS 0.8% chance of exploitation in 30 days, percentile 56%
public exploits
0
none known

Summary

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

Patch / fix

  • Linux Linux 5.5, 5.10.249, 5.15.199, 6.1.162, 6.6.122, 6.8, 6.12.67, 6.18.7, 6.19
  • linux Debian 12 6.1.162-1
  • linux Debian 13 6.12.69-1
  • linux Debian 14 6.18.8-1

debian advisories DEBIAN-CVE-2026-22998

  • linux Ubuntu 22.04 LTS 5.15.0-176.186
  • linux Ubuntu 24.04 LTS 6.8.0-117.117
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1105.112
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1055.58
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1105.114
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1058.61
  • linux-gke Ubuntu 22.04 LTS 5.15.0-1101.107
  • linux-gke Ubuntu 24.04 LTS 6.8.0-1054.60

ubuntu advisories UBUNTU-CVE-2026-22998

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • kernel RHEL 9 5.14.0-611.34.1.el9_7
  • rv RHEL 9 5.14.0-611.34.1.el9_7
  • perf RHEL 9 5.14.0-611.34.1.el9_7
  • rtla RHEL 9 5.14.0-611.34.1.el9_7
  • libperf RHEL 9 5.14.0-611.34.1.el9_7
  • kernel-rt RHEL 9 5.14.0-611.34.1.el9_7
  • kernel-64k RHEL 9 5.14.0-611.34.1.el9_7
  • kernel-core RHEL 9 5.14.0-611.34.1.el9_7

red hat advisories RHSA-2026:2722RHSA-2026:2721RHSA-2026:2378RHSA-2026:2264

  • kernel-64kb SLE Module for Basesystem 15 SP7 6.4.0-150700.53.34.1
  • kernel-syms SLE Module for Development Tools 15 SP7 6.4.0-150700.53.34.1
  • kernel-azure SLE Module for Public Cloud 15 SP7 6.4.0-150700.53.34.1
  • kernel-source SLE Module for Development Tools 15 SP7, SLE Module for Basesystem 15 SP7 6.4.0-150700.53.34.1
  • kernel-default SLE Workstation Extension 15 SP7, SLE Module for Legacy 15 SP7, SLE Module for Basesystem 15 SP7 +2 more 6.4.0-150700.53.34.1
  • kernel-zfcpdump SLE Module for Basesystem 15 SP7 6.4.0-150700.53.34.1
  • kernel-obs-build SLE Module for Development Tools 15 SP7 6.4.0-150700.53.34.1
  • kernel-default-base SLE Module for Basesystem 15 SP7 6.4.0-150700.53.34.1.150700.17.23.1

suse advisories SUSE-SU-2026:1081-1SUSE-SU-2026:1078-1SUSE-SU-2026:20873-1SUSE-SU-2026:20838-1SUSE-SU-2026:20931-1SUSE-SU-2026:20845-1

  • kernel-rt openSUSE Leap 16.0 6.12.0-160000.27.1
  • dtb-aarch64 openSUSE Leap 16.0 6.12.0-160000.27.1
  • kernel-64kb openSUSE Leap 16.0 6.12.0-160000.27.1
  • kernel-syms openSUSE Leap 16.0 6.12.0-160000.27.1
  • kernel-azure openSUSE Leap 16.0 6.12.0-160000.27.1
  • kernel-obs-qa openSUSE Leap 16.0 6.12.0-160000.27.1
  • kernel-source openSUSE Leap 16.0 6.12.0-160000.27.1
  • kernel-default openSUSE Leap 16.0 6.12.0-160000.27.1

opensuse advisories openSUSE-SU-2026:20416-1

  • kernel-abi-stablelists AlmaLinux 10 6.12.0-124.38.1.el10_1
  • kernel AlmaLinux 9 5.14.0-611.34.1.el9_7
  • rv AlmaLinux 9 5.14.0-611.34.1.el9_7
  • perf AlmaLinux 9 5.14.0-611.34.1.el9_7
  • rtla AlmaLinux 9 5.14.0-611.34.1.el9_7
  • libperf AlmaLinux 9 5.14.0-611.34.1.el9_7
  • kernel-rt AlmaLinux 9 5.14.0-611.34.1.el9_7
  • kernel-64k AlmaLinux 9 5.14.0-611.34.1.el9_7

almalinux advisories ALSA-2026:2721ALSA-2026:2722ALSA-2026:2378ALSA-2026:2264

  • kernel Rocky Linux 10 6.12.0-124.38.1.el10_1
  • kernel Rocky Linux 9 5.14.0-611.34.1.el9_7
  • kernel Rocky Linux 8 4.18.0-553.104.1.el8_10

rocky linux advisories RLSA-2026:2721RLSA-2026:2722RLSA-2026:2264

  • kernel CBL-Mariner 2.0 5.15.200.1-1
  • kernel Azure Linux 3.0 6.6.126.1-1

azure linux advisories AZL-78482AZL-78491

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-22998 updated cvss 6.4

kernel: nvme-tcp: fix NULL pointer dereferences in nvmet_tcp_build_pdu_iovec

  • Red Hat Enterprise Linux 9 kernel-rt, kernel-rt-kvm, kernel-rt-core, kernel-rt-modules, kernel-rt-debug-kvm, kernel-rt-debug-core, +12 more
    affected: workaround, no fix available
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-611.34.1.el9_7, perf 5.14.0-611.34.1.el9_7, rtla 5.14.0-611.34.1.el9_7, python3-perf 5.14.0-611.34.1.el9_7, kernel-devel-matched 5.14.0-611.34.1.el9_7, kernel-64k-devel-matched 5.14.0-611.34.1.el9_7, +7 more
    fixed: vendor fix RHSA-2026:2722
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-124.38.1.el10_1, perf 6.12.0-124.38.1.el10_1, rtla 6.12.0-124.38.1.el10_1, python3-perf 6.12.0-124.38.1.el10_1, kernel-devel-matched 6.12.0-124.38.1.el10_1, kernel-64k-devel-matched 6.12.0-124.38.1.el10_1, +7 more
    fixed: vendor fix RHSA-2026:2721
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-553.104.1.el8_10, kernel 4.18.0-553.104.1.el8_10, bpftool 4.18.0-553.104.1.el8_10, kernel-core 4.18.0-553.104.1.el8_10, kernel-tools 4.18.0-553.104.1.el8_10, python3-perf 4.18.0-553.104.1.el8_10, +15 more
    fixed: vendor fix RHSA-2026:2264
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-611.34.1.el9_7, kernel-64k 5.14.0-611.34.1.el9_7, kernel-core 5.14.0-611.34.1.el9_7, kernel-tools 5.14.0-611.34.1.el9_7, kernel-modules 5.14.0-611.34.1.el9_7, kernel-64k-core 5.14.0-611.34.1.el9_7, +27 more
    fixed: vendor fix RHSA-2026:2722
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-124.38.1.el10_1, kernel-64k 6.12.0-124.38.1.el10_1, kernel-core 6.12.0-124.38.1.el10_1, kernel-tools 6.12.0-124.38.1.el10_1, kernel-modules 6.12.0-124.38.1.el10_1, kernel-64k-core 6.12.0-124.38.1.el10_1, +28 more
    fixed: vendor fix RHSA-2026:2721
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-611.34.1.el9_7, kernel-debuginfo-common-s390x 5.14.0-611.34.1.el9_7, kernel-debuginfo-common-x86_64 5.14.0-611.34.1.el9_7, kernel-debuginfo-common-aarch64 5.14.0-611.34.1.el9_7, kernel-debuginfo-common-ppc64le 5.14.0-611.34.1.el9_7
    fixed: vendor fix RHSA-2026:2722
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-124.38.1.el10_1, kernel-debuginfo-common-s390x 6.12.0-124.38.1.el10_1, kernel-debuginfo-common-x86_64 6.12.0-124.38.1.el10_1, kernel-debuginfo-common-aarch64 6.12.0-124.38.1.el10_1, kernel-debuginfo-common-ppc64le 6.12.0-124.38.1.el10_1
    fixed: vendor fix RHSA-2026:2721
show 8 more
  • Red Hat Enterprise Linux CRB (v. 8) kernel-debuginfo-common-x86_64 4.18.0-553.104.1.el8_10, kernel-debuginfo-common-aarch64 4.18.0-553.104.1.el8_10, kernel-debuginfo-common-ppc64le 4.18.0-553.104.1.el8_10
    fixed: vendor fix RHSA-2026:2264
  • Red Hat Enterprise Linux NFV (v. 8) kernel-rt 4.18.0-553.104.1.rt7.445.el8_10, kernel-rt-kvm 4.18.0-553.104.1.rt7.445.el8_10, kernel-rt-core 4.18.0-553.104.1.rt7.445.el8_10, kernel-rt-modules 4.18.0-553.104.1.rt7.445.el8_10, kernel-rt-debug-kvm 4.18.0-553.104.1.rt7.445.el8_10, kernel-rt-debug-core 4.18.0-553.104.1.rt7.445.el8_10, +4 more
    fixed: vendor fix RHSA-2026:2378
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-611.34.1.el9_7, kernel-rt-64k 5.14.0-611.34.1.el9_7, kernel-rt-core 5.14.0-611.34.1.el9_7, kernel-rt-modules 5.14.0-611.34.1.el9_7, kernel-rt-64k-core 5.14.0-611.34.1.el9_7, kernel-rt-debug-core 5.14.0-611.34.1.el9_7, +14 more
    fixed: vendor fix RHSA-2026:2722
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-124.38.1.el10_1, kernel-rt-64k 6.12.0-124.38.1.el10_1, kernel-rt-core 6.12.0-124.38.1.el10_1, kernel-rt-modules 6.12.0-124.38.1.el10_1, kernel-rt-64k-core 6.12.0-124.38.1.el10_1, kernel-rt-debug-core 6.12.0-124.38.1.el10_1, +14 more
    fixed: vendor fix RHSA-2026:2721
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-611.34.1.el9_7, kernel-rt-core 5.14.0-611.34.1.el9_7, kernel-rt-modules 5.14.0-611.34.1.el9_7, kernel-rt-debug-core 5.14.0-611.34.1.el9_7, kernel-rt-modules-core 5.14.0-611.34.1.el9_7, kernel-rt-debug-modules 5.14.0-611.34.1.el9_7, +4 more
    fixed: vendor fix RHSA-2026:2722
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-124.38.1.el10_1, kernel-rt-core 6.12.0-124.38.1.el10_1, kernel-rt-modules 6.12.0-124.38.1.el10_1, kernel-rt-debug-core 6.12.0-124.38.1.el10_1, kernel-rt-modules-core 6.12.0-124.38.1.el10_1, kernel-rt-debug-modules 6.12.0-124.38.1.el10_1, +4 more
    fixed: vendor fix RHSA-2026:2721
  • Red Hat Enterprise Linux RT (v. 8) kernel-rt 4.18.0-553.104.1.rt7.445.el8_10, kernel-rt-core 4.18.0-553.104.1.rt7.445.el8_10, kernel-rt-modules 4.18.0-553.104.1.rt7.445.el8_10, kernel-rt-debug-core 4.18.0-553.104.1.rt7.445.el8_10, kernel-rt-debug-modules 4.18.0-553.104.1.rt7.445.el8_10, kernel-rt-modules-extra 4.18.0-553.104.1.rt7.445.el8_10, +2 more
    fixed: vendor fix RHSA-2026:2378
  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
4 mo ago

Exploit prediction

0.78% chance of exploitation in the next 30 days, higher than 56% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Linux Linux

Classification

Weakness
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.