---
id: CVE-2026-52989
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  nvmet-tcp: propagate nvmet_tcp_build_pdu_iovec() errors to its callers

  Currently, when nvmet_tcp_build_pdu_iovec() detects an out-of-bounds
  PDU length or offset, it tr…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  nvmet-tcp: propagate nvmet_tcp_build_pdu_iovec() errors to its callers

  Currently, when nvmet_tcp_build_pdu_iovec() detects an out-of-bounds
  PDU length or offset, it tr…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-390
published: '2026-06-24'
updated: '2026-07-10'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-52989'
references:
  - url: 'https://git.kernel.org/stable/c/046fa5c72d15cd8e2d592e275697ea399d8f76b0'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/3df42a854686fa06484e37ac1a3931c8e3e3453c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/c2a11441538bdbbc5aa003f190995eba93a89b88'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d7c8f95f599b3b38a717d2e771c3f8c174f657c3'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ea8e356acb165cb1fd75537a52e1f66e5e76c538'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/f9204a2b78dd18374d3bcf9bf93d9021ce22de1b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://access.redhat.com/security/cve/CVE-2026-52989'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2492443'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-52989.json
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
tags:
  - nvd
epss: 0.00511
epssPercentile: 0.41141
ingestedAt: '2026-07-11T13:13:25.586Z'
---

## Overview

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

nvmet-tcp: propagate nvmet_tcp_build_pdu_iovec() errors to its callers

Currently, when nvmet_tcp_build_pdu_iovec() detects an out-of-bounds
PDU length or offset, it triggers nvmet_tcp_fatal_error(cmd->queue)
and returns early. However, because the function returns void, the
callers are entirely unaware that a fatal error has occurred and
that the cmd->recv_msg.msg_iter was left uninitialized.

Callers such as nvmet_tcp_handle_h2c_data_pdu() proceed to blindly
overwrite the queue state with queue->rcv_state = NVMET_TCP_RECV_DATA
Consequently, the socket receiving loop may attempt to read incoming
network data into the uninitialized iterator.

Fix this by shifting the error handling responsibility to the callers.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.