---
id: CVE-2024-50043
title: 'nfsd: fix possible badness in FREE_STATEID'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  nfsd: fix possible badness in FREE_STATEID

  When multiple FREE_STATEIDs are sent for the same delegation stateid,
  it can lead to a possible either use-after-free or cou…
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'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 3f29cc82a84c23cfd12b903029dd26002ca825f5 <
    7ca9e472ce5c67daa3188a348ece8c02a0765039
  - >-
    Linux >= 3f29cc82a84c23cfd12b903029dd26002ca825f5 <
    c88c150a467fcb670a1608e2272beeee3e86df6e
  - Linux 172d038b7c4d3cfa9fc5ac210577c5c4f8256320
  - Linux >= 6.6.160 < 6.7
  - Linux 6.9
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2024-10-22T13:24:30.411615Z'
published: '2024-10-21'
updated: '2026-10-21'
sourceUpdated: '2026-10-21T12:35:27.778Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2024-50043'
references:
  - url: 'https://git.kernel.org/stable/c/7ca9e472ce5c67daa3188a348ece8c02a0765039'
  - url: 'https://git.kernel.org/stable/c/c88c150a467fcb670a1608e2272beeee3e86df6e'
tags:
  - cve.org
epss: 0.00498
epssPercentile: 0.4249
ingestedAt: '2026-10-21T12:48:53.727Z'
---

## Overview

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

nfsd: fix possible badness in FREE_STATEID

When multiple FREE_STATEIDs are sent for the same delegation stateid,
it can lead to a possible either use-after-free or counter refcount
underflow errors.

In nfsd4_free_stateid() under the client lock we find a delegation
stateid, however the code drops the lock before calling nfs4_put_stid(),
that allows another FREE_STATE to find the stateid again. The first one
will proceed to then free the stateid which leads to either
use-after-free or decrementing already zeroed counter.

## Affected

- `Linux >= 3f29cc82a84c23cfd12b903029dd26002ca825f5 < 7ca9e472ce5c67daa3188a348ece8c02a0765039`
- `Linux >= 3f29cc82a84c23cfd12b903029dd26002ca825f5 < c88c150a467fcb670a1608e2272beeee3e86df6e`
- `Linux 172d038b7c4d3cfa9fc5ac210577c5c4f8256320`
- `Linux >= 6.6.160 < 6.7`
- `Linux 6.9`

## Remediation

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