---
id: CVE-2022-48828
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  NFSD: Fix ia_size underflow

  iattr::ia_size is a loff_t, which is a signed 64-bit type
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  NFSD: Fix ia_size underflow

  iattr::ia_size is a loff_t, which is a signed 64-bit type. NFSv3 and
  NFSv4 both define file size as an unsigned 64-bit type. Thus there
  is …
severity: critical
cvss: 9.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H'
cwe:
  - CWE-191
vendor: linux
product: linux_kernel
affected:
  - linux_kernel < 5.4.295
  - 'linux_kernel >= 5.5, < 5.10.220'
  - 'linux_kernel >= 5.11, < 5.15.24'
  - 'linux_kernel >= 5.16, < 5.16.10'
  - linux_kernel = 5.17
patched:
  - linux_kernel 5.16.10
published: '2024-07-16'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T19:16:57.047'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2022-48828'
references:
  - url: 'https://git.kernel.org/stable/c/38d02ba22e43b6fc7d291cf724bc6e3b7be6626b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/8e0ecaf7a7e57b30284d6b3289cc436100fadc48'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d2211e6e34d0755f35e2f8c22d81999fa81cfc71'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/da22ca1ad548429d7822011c54cfe210718e0aa7'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/e6faac3f58c7c4176b66f63def17a34232a17b0e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/38d02ba22e43b6fc7d291cf724bc6e3b7be6626b'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/8e0ecaf7a7e57b30284d6b3289cc436100fadc48'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/da22ca1ad548429d7822011c54cfe210718e0aa7'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/e6faac3f58c7c4176b66f63def17a34232a17b0e'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-265688.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-355557.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
  - cve.org
epss: 0.00631
epssPercentile: 0.50044
ingestedAt: '2026-10-14T19:49:57.532Z'
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2024-09-10T16:57:36.884780Z'
---

## Overview

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

NFSD: Fix ia_size underflow

iattr::ia_size is a loff_t, which is a signed 64-bit type. NFSv3 and
NFSv4 both define file size as an unsigned 64-bit type. Thus there
is a range of valid file size values an NFS client can send that is
already larger than Linux can handle.

Currently decode_fattr4() dumps a full u64 value into ia_size. If
that value happens to be larger than S64_MAX, then ia_size
underflows. I'm about to fix up the NFSv3 behavior as well, so let's
catch the underflow in the common code path: nfsd_setattr().

## Affected

- `linux_kernel < 5.4.295`
- `linux_kernel >= 5.5, < 5.10.220`
- `linux_kernel >= 5.11, < 5.15.24`
- `linux_kernel >= 5.16, < 5.16.10`
- `linux_kernel = 5.17`

## Remediation

Upgrade past the affected range:

- `linux_kernel 5.16.10`