---
id: CVE-2022-49800
title: 'tracing: Fix memory leak in test_gen_synth_cmd() and test_empty_synth_event()'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  tracing: Fix memory leak in test_gen_synth_cmd() and test_empty_synth_event()

  test_gen_synth_cmd() only free buf in fail path, hence buf will leak
  when there is no fai…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 9fe41efaca08416657efa8731c0d47ccb6a3f3eb <
    65ba7e7c241122ef0a9e61d1920f2ae9689aa796
  - >-
    Linux >= 9fe41efaca08416657efa8731c0d47ccb6a3f3eb <
    07ba4f0603aba288580866394f2916dfe55823a2
  - >-
    Linux >= 9fe41efaca08416657efa8731c0d47ccb6a3f3eb <
    0e5baaa181a052d968701bb9c5b1d55847f00942
  - >-
    Linux >= 9fe41efaca08416657efa8731c0d47ccb6a3f3eb <
    a4527fef9afe5c903c718d0cd24609fe9c754250
  - Linux 5.6
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-05T19:48:41.057276Z'
published: '2025-05-01'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T19:49:49.647Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2022-49800'
references:
  - url: 'https://git.kernel.org/stable/c/65ba7e7c241122ef0a9e61d1920f2ae9689aa796'
  - url: 'https://git.kernel.org/stable/c/07ba4f0603aba288580866394f2916dfe55823a2'
  - url: 'https://git.kernel.org/stable/c/0e5baaa181a052d968701bb9c5b1d55847f00942'
  - url: 'https://git.kernel.org/stable/c/a4527fef9afe5c903c718d0cd24609fe9c754250'
tags:
  - cve.org
epss: 0.00202
epssPercentile: 0.10137
ingestedAt: '2026-11-05T22:38:31.598Z'
---

## Overview

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

tracing: Fix memory leak in test_gen_synth_cmd() and test_empty_synth_event()

test_gen_synth_cmd() only free buf in fail path, hence buf will leak
when there is no failure. Add kfree(buf) to prevent the memleak. The
same reason and solution in test_empty_synth_event().

unreferenced object 0xffff8881127de000 (size 2048):
  comm "modprobe", pid 247, jiffies 4294972316 (age 78.756s)
  hex dump (first 32 bytes):
    20 67 65 6e 5f 73 79 6e 74 68 5f 74 65 73 74 20   gen_synth_test
    20 70 69 64 5f 74 20 6e 65 78 74 5f 70 69 64 5f   pid_t next_pid_
  backtrace:
    [<000000004254801a>] kmalloc_trace+0x26/0x100
    [<0000000039eb1cf5>] 0xffffffffa00083cd
    [<000000000e8c3bc8>] 0xffffffffa00086ba
    [<00000000c293d1ea>] do_one_initcall+0xdb/0x480
    [<00000000aa189e6d>] do_init_module+0x1cf/0x680
    [<00000000d513222b>] load_module+0x6a50/0x70a0
    [<000000001fd4d529>] __do_sys_finit_module+0x12f/0x1c0
    [<00000000b36c4c0f>] do_syscall_64+0x3f/0x90
    [<00000000bbf20cf3>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
unreferenced object 0xffff8881127df000 (size 2048):
  comm "modprobe", pid 247, jiffies 4294972324 (age 78.728s)
  hex dump (first 32 bytes):
    20 65 6d 70 74 79 5f 73 79 6e 74 68 5f 74 65 73   empty_synth_tes
    74 20 20 70 69 64 5f 74 20 6e 65 78 74 5f 70 69  t  pid_t next_pi
  backtrace:
    [<000000004254801a>] kmalloc_trace+0x26/0x100
    [<00000000d4db9a3d>] 0xffffffffa0008071
    [<00000000c31354a5>] 0xffffffffa00086ce
    [<00000000c293d1ea>] do_one_initcall+0xdb/0x480
    [<00000000aa189e6d>] do_init_module+0x1cf/0x680
    [<00000000d513222b>] load_module+0x6a50/0x70a0
    [<000000001fd4d529>] __do_sys_finit_module+0x12f/0x1c0
    [<00000000b36c4c0f>] do_syscall_64+0x3f/0x90
    [<00000000bbf20cf3>] entry_SYSCALL_64_after_hwframe+0x63/0xcd

## Affected

- `Linux >= 9fe41efaca08416657efa8731c0d47ccb6a3f3eb < 65ba7e7c241122ef0a9e61d1920f2ae9689aa796`
- `Linux >= 9fe41efaca08416657efa8731c0d47ccb6a3f3eb < 07ba4f0603aba288580866394f2916dfe55823a2`
- `Linux >= 9fe41efaca08416657efa8731c0d47ccb6a3f3eb < 0e5baaa181a052d968701bb9c5b1d55847f00942`
- `Linux >= 9fe41efaca08416657efa8731c0d47ccb6a3f3eb < a4527fef9afe5c903c718d0cd24609fe9c754250`
- `Linux 5.6`

## Remediation

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