---
id: CVE-2024-53217
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  NFSD: Prevent NULL dereference in nfsd4_process_cb_update()

  @ses is initialized to NULL
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  NFSD: Prevent NULL dereference in nfsd4_process_cb_update()

  @ses is initialized to NULL. If __nfsd4_find_backchannel() finds no
  available backchannel session, setup_ca…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-476
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 2.6.38, < 4.19.325'
  - 'linux_kernel >= 4.20, < 5.4.287'
  - 'linux_kernel >= 5.5, < 5.10.231'
  - 'linux_kernel >= 5.11, < 5.15.174'
  - 'linux_kernel >= 5.16, < 6.1.120'
  - 'linux_kernel >= 6.2, < 6.6.64'
  - 'linux_kernel >= 6.7, < 6.11.11'
  - 'linux_kernel >= 6.12, < 6.12.2'
patched:
  - linux_kernel 6.12.2
published: '2024-12-27'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T01:19:15.683'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2024-53217'
references:
  - url: 'https://git.kernel.org/stable/c/03178cd8f67227015debb700123987fe96275cd1'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/0c3b0e326f838787d229314d4de83af9c53347e8'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/1e02c641c3a43c88cecc08402000418e15578d38'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/4a4ffc1aa9d618e41ad9151f40966e402e58a5a2'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/752a75811f27300fe8131b0a1efc91960f6f88e7'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/c5d90f9302742985a5078e42ac38de42c364c44a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/cac1405e3ff6685a438e910ad719e0cf06af90ee'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d9a0d1f6e15859ea7a86a327f28491e23deaaa62'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/eb51733ae5fc73d95bd857d5da26f9f65b202a79'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-355557.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-398330.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
  - cve.org
epss: 0.0073
epssPercentile: 0.54387
ingestedAt: '2026-10-15T03:30:12.772Z'
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2025-10-01T20:03:26.697178Z'
---

## Overview

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

NFSD: Prevent NULL dereference in nfsd4_process_cb_update()

@ses is initialized to NULL. If __nfsd4_find_backchannel() finds no
available backchannel session, setup_callback_client() will try to
dereference @ses and segfault.

## Affected

- `linux_kernel >= 2.6.38, < 4.19.325`
- `linux_kernel >= 4.20, < 5.4.287`
- `linux_kernel >= 5.5, < 5.10.231`
- `linux_kernel >= 5.11, < 5.15.174`
- `linux_kernel >= 5.16, < 6.1.120`
- `linux_kernel >= 6.2, < 6.6.64`
- `linux_kernel >= 6.7, < 6.11.11`
- `linux_kernel >= 6.12, < 6.12.2`

## Remediation

Upgrade past the affected range:

- `linux_kernel 6.12.2`