---
id: CVE-2026-98844
title: >-
  kernel: netfs: clear post-EOF pagecache when extending a file via write
  (CVE-2026-98844)
summary: >-
  A flaw was found in the Linux kernel's network filesystem (netfs) subsystem.
  When a file is extended through write operations after previous writes were
  performed via memory mapping, the system fails to clear stale cache data
  located beyon…
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: Red Hat
product: Red Hat Enterprise Linux 10
affected:
  - enterprise_linux 10
published: '2026-10-18'
updated: '2026-10-23'
sourceUpdated: '2026-10-23T22:09:34+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98844.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98844.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-98844'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2555200'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-98844'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-98844'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98844.mbox
  - url: 'https://git.kernel.org/stable/c/f8f7d86b3537e885ee620898a38b749fba8a8456'
  - url: 'https://git.kernel.org/stable/c/98f6a4589e0f5f6cf819b8dd45605efc481c06ce'
  - url: 'https://git.kernel.org/stable/c/a7036a73671fc83d299bc770710fe996d9fef9ca'
  - url: 'https://git.kernel.org/stable/c/69bf14300b50631e7c2271289d347bbd1b19a06c'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00156
epssPercentile: 0.04728
ingestedAt: '2026-10-18T16:47:32.465Z'
---

## Overview

A flaw was found in the Linux kernel's network filesystem (netfs) subsystem. When a file is extended through write operations after previous writes were performed via memory mapping, the system fails to clear stale cache data located beyond the original end of the file. A local user could exploit this flaw to read stale data from the newly exposed file regions, leading to information disclosure and data corruption.

## Vendor advisories

- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 10 · no fix planned: Red Hat Enterprise Linux 10 · updated 2026-10-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98844.json)

**kernel: netfs: clear post-EOF pagecache when extending a file via write** — rated Low by Red Hat. Released 2026-10-18, updated 2026-10-23.

Affected:

- Red Hat Enterprise Linux 10

No fix planned:

- Red Hat Enterprise Linux 10

Not affected:

- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

## Remediation

Fix deferred