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TI-2026-18435 Aliases CVE-2026-22998GHSA-xjx5-8v38-q6gh

nvme-tcp: fix NULL pointer dereferences in nvmet_tcp_build_pdu_iovec

Priority MEDIUM 40CWE-476Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 14 fixed, 1 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-476.

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

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00778 56th percentileScored 2026-11-07
Fix Partial Linux (Linux): 5.10.249, 5.15.199, 6.1.162 +6Red Hat: 4 advisoriesRed Hat: 14 fixed, 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
LinuxLinux5.10.209 to before 5.10.249; 5.15.148 to before 5.15.199; 6.1.75 to before 6.1.162; 6.6.14 to before 6.6.122; 5.4.268 to before 5.5; 6.7.2 to before 6.85.10.249, 5.15.199, 6.1.162, 6.6.122, 5.5, 6.8Patch availableCNA
LinuxLinux6.8 and later5.10.249, 5.15.199, 6.1.162, 6.6.122, 6.12.67, 6.18.7, 6.19Patch availableCNA
  • Linux VendorLinux Affected 5.10.209 to before 5.10.249; 5.15.148 to before 5.15.199; 6.1.75 to before 6.1.162; 6.6.14 to before 6.6.122; 5.4.268 to before 5.5; 6.7.2 to before 6.8 Fixed in 5.10.249, 5.15.199, 6.1.162, 6.6.122, 5.5, 6.8 Patch available CNA
  • Linux VendorLinux Affected 6.8 and later Fixed in 5.10.249, 5.15.199, 6.1.162, 6.6.122, 6.12.67, 6.18.7, 6.19 Patch available CNA

CPE configurations NVD · 6

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*5.4.268 to before 5.5; 5.10.209 to before 5.10.249; 5.15.148 to before 5.15.199; 6.1.75 to before 6.1.162; 6.6.14 to before 6.6.122; 6.7.2 to before 6.12.67; 6.13 to before 6.18.7VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.19:rc1:*:*:*:*:*:*6.19 rc1VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.19:rc2:*:*:*:*:*:*6.19 rc2VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.19:rc3:*:*:*:*:*:*6.19 rc3VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.19:rc4:*:*:*:*:*:*6.19 rc4VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.19:rc5:*:*:*:*:*:*6.19 rc5VulnerableLinux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 5.4.268 to before 5.5; 5.10.209 to before 5.10.249; 5.15.148 to before 5.15.199; 6.1.75 to before 6.1.162; 6.6.14 to before 6.6.122; 6.7.2 to before 6.12.67; 6.13 to before 6.18.7 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.19:rc1:*:*:*:*:*:* Versions 6.19 rc1 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.19:rc2:*:*:*:*:*:* Versions 6.19 rc2 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.19:rc3:*:*:*:*:*:* Versions 6.19 rc3 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.19:rc4:*:*:*:*:*:* Versions 6.19 rc4 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.19:rc5:*:*:*:*:*:* Versions 6.19 rc5 Vulnerable ·Linux

Remediation

  • Fix · CNA Linux (Linux) Fixed in 5.10.249, 5.15.199, 6.1.162, 6.6.122, 5.5, 6.8
  • Fix · CNA Linux (Linux) Fixed in 5.10.249, 5.15.199, 6.1.162, 6.6.122, 6.12.67, 6.18.7, 6.19

Red Hat 4 advisories

  • RHSA-2026:2722 Released 2026-02-16 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-611.34.1.el9_7, kernel-64k-debug-devel-matched-5.14.0-611.34.1.el9_7, kernel-64k-devel-5.14.0-611.34.1.el9_7 +12
    • 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-64k-core-5.14.0-611.34.1.el9_7 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-611.34.1.el9_7, libperf-5.14.0-611.34.1.el9_7
    • 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-64k-core-5.14.0-611.34.1.el9_7 +21
    • 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-debug-5.14.0-611.34.1.el9_7 +9
  • RHSA-2026:2721 Released 2026-02-16 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux AppStream (v. 10) kernel-64k-debug-devel-6.12.0-124.38.1.el10_1, kernel-64k-debug-devel-matched-6.12.0-124.38.1.el10_1, kernel-64k-devel-6.12.0-124.38.1.el10_1 +12
    • 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-64k-core-6.12.0-124.38.1.el10_1 +29
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) kernel-tools-libs-devel-6.12.0-124.38.1.el10_1, libperf-6.12.0-124.38.1.el10_1
    • 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-64k-core-6.12.0-124.38.1.el10_1 +21
    • 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-debug-6.12.0-124.38.1.el10_1 +9
  • RHSA-2026:2378 Released 2026-02-10 · Red Hat rating Moderate
    kernel-rt security update
    • Red Hat Enterprise Linux NFV (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-debug-4.18.0-553.104.1.rt7.445.el8_10 +9
    • 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-debug-4.18.0-553.104.1.rt7.445.el8_10 +7
Show 1 more Red Hat advisories
  • RHSA-2026:2264 Released 2026-02-09 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-553.104.1.el8_10, kernel-4.18.0-553.104.1.el8_10, kernel-abi-stablelists-4.18.0-553.104.1.el8_10 +19
    • Red Hat Enterprise Linux CRB (v. 8) kernel-tools-libs-devel-4.18.0-553.104.1.el8_10

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 9AffectedNo fix yet
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:2721
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:2722
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2026:2721
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2026:2264
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2026:2722
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2026:2264
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:2721
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:2722
Red Hat Enterprise Linux NFV (v. 8)Fixed RHSA-2026:2378
Red Hat Enterprise Linux RT (v. 8)Fixed RHSA-2026:2378
Red Hat Enterprise Linux Real Time (v. 10)Fixed RHSA-2026:2721
Red Hat Enterprise Linux Real Time (v. 9)Fixed RHSA-2026:2722
Red Hat Enterprise Linux Real Time for NFV (v. 10)Fixed RHSA-2026:2721
Red Hat Enterprise Linux Real Time for NFV (v. 9)Fixed RHSA-2026:2722
Not affected: 2 products
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-22998
  2. 2026-10-03 Alias added: GHSA-xjx5-8v38-q6gh
  3. 2026-10-19 Weakness changed · CISA ADP

References

Patch 7

  • TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
  • TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
  • TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
  • TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
  • TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
See all 15278 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences