---
id: CVE-2026-89498
title: 'orangefs: fix double-free of trailer_buf on readdir copy failure'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  orangefs: fix double-free of trailer_buf on readdir copy failure

  On a readdir downcall, orangefs_devreq_write_iter() frees
  op->downcall.trailer_buf with vfree() when c…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe:
  - CWE-763
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 382f4581e67f57209c7aa67e39f26ba076306a2e <
    712c4235fcc73c11a2f1d59a499d489e49c374a4
  - >-
    Linux >= 382f4581e67f57209c7aa67e39f26ba076306a2e <
    433c2e470053cc9c712314d3d8c3dfbc862d68eb
  - >-
    Linux >= 382f4581e67f57209c7aa67e39f26ba076306a2e <
    6e5924644ef4bce06a3cbb7cb841a8bbfdfc03ad
  - >-
    Linux >= 382f4581e67f57209c7aa67e39f26ba076306a2e <
    9c9eacc47c618ed6d7d35fe75a40d294c8cdbffa
  - >-
    Linux >= 382f4581e67f57209c7aa67e39f26ba076306a2e <
    2f5454a25127854c232fde5d1d65d16fbcd42d43
  - >-
    Linux >= 382f4581e67f57209c7aa67e39f26ba076306a2e <
    f796f38a324e89547738f4b70cc33be5be2bc6da
  - >-
    Linux >= 382f4581e67f57209c7aa67e39f26ba076306a2e <
    519f4146b8b8c5f20c2ad01913acd6df2df8fc8e
  - >-
    Linux >= 382f4581e67f57209c7aa67e39f26ba076306a2e <
    f574296be7f46eb60beca851240b526df232f480
  - Linux 4.12
published: '2026-09-11'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T08:47:49.902Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-89498'
references:
  - url: 'https://git.kernel.org/stable/c/712c4235fcc73c11a2f1d59a499d489e49c374a4'
  - url: 'https://git.kernel.org/stable/c/433c2e470053cc9c712314d3d8c3dfbc862d68eb'
  - url: 'https://git.kernel.org/stable/c/6e5924644ef4bce06a3cbb7cb841a8bbfdfc03ad'
  - url: 'https://git.kernel.org/stable/c/9c9eacc47c618ed6d7d35fe75a40d294c8cdbffa'
  - url: 'https://git.kernel.org/stable/c/2f5454a25127854c232fde5d1d65d16fbcd42d43'
  - url: 'https://git.kernel.org/stable/c/f796f38a324e89547738f4b70cc33be5be2bc6da'
  - url: 'https://git.kernel.org/stable/c/519f4146b8b8c5f20c2ad01913acd6df2df8fc8e'
  - url: 'https://git.kernel.org/stable/c/f574296be7f46eb60beca851240b526df232f480'
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89498.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89498'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532343'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89498'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89498'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89498.mbox
tags:
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00177
epssPercentile: 0.07173
ingestedAt: '2026-09-14T15:23:07.452Z'
---

## Overview

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

orangefs: fix double-free of trailer_buf on readdir copy failure

On a readdir downcall, orangefs_devreq_write_iter() frees
op->downcall.trailer_buf with vfree() when copy_from_iter_full() fails,
but does not clear the pointer before goto Efault. The waiter in
do_readdir() is then woken with a negative status and frees the same
pointer again on its r < 0 path, causing a deterministic double-free.
A client holding /dev/pvfs2-req triggers it by sending a readdir
downcall whose declared trailer_size exceeds the bytes it supplies.

Clear the pointer after freeing so the readdir-side vfree() becomes a
no-op.

## Affected

- `Linux >= 382f4581e67f57209c7aa67e39f26ba076306a2e < 712c4235fcc73c11a2f1d59a499d489e49c374a4`
- `Linux >= 382f4581e67f57209c7aa67e39f26ba076306a2e < 433c2e470053cc9c712314d3d8c3dfbc862d68eb`
- `Linux >= 382f4581e67f57209c7aa67e39f26ba076306a2e < 6e5924644ef4bce06a3cbb7cb841a8bbfdfc03ad`
- `Linux >= 382f4581e67f57209c7aa67e39f26ba076306a2e < 9c9eacc47c618ed6d7d35fe75a40d294c8cdbffa`
- `Linux >= 382f4581e67f57209c7aa67e39f26ba076306a2e < 2f5454a25127854c232fde5d1d65d16fbcd42d43`
- `Linux >= 382f4581e67f57209c7aa67e39f26ba076306a2e < f796f38a324e89547738f4b70cc33be5be2bc6da`
- `Linux >= 382f4581e67f57209c7aa67e39f26ba076306a2e < 519f4146b8b8c5f20c2ad01913acd6df2df8fc8e`
- `Linux >= 382f4581e67f57209c7aa67e39f26ba076306a2e < f574296be7f46eb60beca851240b526df232f480`
- `Linux 4.12`

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Moderate · updated 2026-09-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89498.json)