---
id: CVE-2026-98755
title: 'tty: vcc: zero-initialize control packet in vcc_send_ctl()'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  tty: vcc: zero-initialize control packet in vcc_send_ctl()

  The stack-allocated struct vio_vcc pkt was partially initialized,
  leaving the tag.stype_env field uninitiali…
severity: low
cvss: 3.3
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N'
cvssSource: vendor
cwe:
  - CWE-908
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 8868e44a56160328cd4003d95f4083f64b136e33 <
    4b59afc8af3143ae03e4f9b81ca66aa5a1c1ebed
  - >-
    Linux >= 8868e44a56160328cd4003d95f4083f64b136e33 <
    6f1a08ef02825b440126c406ea63ef6128888e15
  - >-
    Linux >= 8868e44a56160328cd4003d95f4083f64b136e33 <
    4335278d0e75395cbfaf71c84b521df56d69e936
  - >-
    Linux >= 8868e44a56160328cd4003d95f4083f64b136e33 <
    399aa38af1d78001612e3130b2056ea392a355ca
  - >-
    Linux >= 8868e44a56160328cd4003d95f4083f64b136e33 <
    1f71f565e3585da1098ff19ca3c24687dab59185
  - Linux 4.14
published: '2026-10-18'
updated: '2026-10-26'
sourceUpdated: '2026-10-26T06:55:50.094Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-98755'
references:
  - url: 'https://git.kernel.org/stable/c/4b59afc8af3143ae03e4f9b81ca66aa5a1c1ebed'
  - url: 'https://git.kernel.org/stable/c/6f1a08ef02825b440126c406ea63ef6128888e15'
  - url: 'https://git.kernel.org/stable/c/4335278d0e75395cbfaf71c84b521df56d69e936'
  - url: 'https://git.kernel.org/stable/c/399aa38af1d78001612e3130b2056ea392a355ca'
  - url: 'https://git.kernel.org/stable/c/1f71f565e3585da1098ff19ca3c24687dab59185'
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98755.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-98755'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2555179'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-98755'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-98755'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98755.mbox
tags:
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00168
epssPercentile: 0.05987
ingestedAt: '2026-10-18T16:47:32.497Z'
---

## Overview

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

tty: vcc: zero-initialize control packet in vcc_send_ctl()

The stack-allocated struct vio_vcc pkt was partially initialized,
leaving the tag.stype_env field uninitialized before being sent via
ldc_write(), potentially leaking kernel stack data to the LDC peer.

## Affected

- `Linux >= 8868e44a56160328cd4003d95f4083f64b136e33 < 4b59afc8af3143ae03e4f9b81ca66aa5a1c1ebed`
- `Linux >= 8868e44a56160328cd4003d95f4083f64b136e33 < 6f1a08ef02825b440126c406ea63ef6128888e15`
- `Linux >= 8868e44a56160328cd4003d95f4083f64b136e33 < 4335278d0e75395cbfaf71c84b521df56d69e936`
- `Linux >= 8868e44a56160328cd4003d95f4083f64b136e33 < 399aa38af1d78001612e3130b2056ea392a355ca`
- `Linux >= 8868e44a56160328cd4003d95f4083f64b136e33 < 1f71f565e3585da1098ff19ca3c24687dab59185`
- `Linux 4.14`

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Low · updated 2026-10-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98755.json)