---
id: CVE-2022-49803
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  netdevsim: Fix memory leak of nsim_dev->fa_cookie

  kmemleak reports this issue:

  unreferenced object 0xffff8881bac872d0 (size 8):
    comm "sh", pid 58603, jiffies 448152…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  netdevsim: Fix memory leak of nsim_dev->fa_cookie

  kmemleak reports this issue:

  unreferenced object 0xffff8881bac872d0 (size 8):
    comm "sh", pid 58603, jiffies 448152…
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'
cwe:
  - CWE-401
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 5.7, < 6.0.10'
  - linux_kernel = 6.1
patched:
  - linux_kernel 6.0.10
published: '2025-05-01'
updated: '2026-07-04'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2022-49803'
references:
  - url: 'https://git.kernel.org/stable/c/064bc7312bd09a48798418663090be0c776183db'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/207edad5717e0a5709ce8467f0eff41c607835c9'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/6d463ddd0107d4188229d996dcdd45c99bad8af7'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/7d79725a7073d86b9185f87718e22f3d65115801'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.00195
epssPercentile: 0.09468
ingestedAt: '2026-07-04T12:56:09.227Z'
---

## Overview

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

netdevsim: Fix memory leak of nsim_dev->fa_cookie

kmemleak reports this issue:

unreferenced object 0xffff8881bac872d0 (size 8):
  comm "sh", pid 58603, jiffies 4481524462 (age 68.065s)
  hex dump (first 8 bytes):
    04 00 00 00 de ad be ef                          ........
  backtrace:
    [<00000000c80b8577>] __kmalloc+0x49/0x150
    [<000000005292b8c6>] nsim_dev_trap_fa_cookie_write+0xc1/0x210 [netdevsim]
    [<0000000093d78e77>] full_proxy_write+0xf3/0x180
    [<000000005a662c16>] vfs_write+0x1c5/0xaf0
    [<000000007aabf84a>] ksys_write+0xed/0x1c0
    [<000000005f1d2e47>] do_syscall_64+0x3b/0x90
    [<000000006001c6ec>] entry_SYSCALL_64_after_hwframe+0x63/0xcd

The issue occurs in the following scenarios:

nsim_dev_trap_fa_cookie_write()
  kmalloc() fa_cookie
  nsim_dev->fa_cookie = fa_cookie
..
nsim_drv_remove()

The fa_cookie allocked in nsim_dev_trap_fa_cookie_write() is not freed. To
fix, add kfree(nsim_dev->fa_cookie) to nsim_drv_remove().

## Affected

- `linux_kernel >= 5.7, < 6.0.10`
- `linux_kernel = 6.1`

## Remediation

Upgrade past the affected range:

- `linux_kernel 6.0.10`