---
id: CVE-2022-49801
title: 'tracing: Fix memory leak in tracing_read_pipe()'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  tracing: Fix memory leak in tracing_read_pipe()

  kmemleak reports this issue:

  unreferenced object 0xffff888105a18900 (size 128):
    comm "test_progs", pid 18933, jiffie…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= efbbdaa22bb78761bff8dfdde027ad04bedd47ce <
    2c21ee020ce43d744ecd7f3e9bddfcaafef270ce
  - >-
    Linux >= efbbdaa22bb78761bff8dfdde027ad04bedd47ce <
    a7d3f8f33c113478737bc61bb32ec5f9a987da7d
  - >-
    Linux >= efbbdaa22bb78761bff8dfdde027ad04bedd47ce <
    649e72070cbbb8600eb823833e4748f5a0815116
  - Linux 840ce9cfc86f89c335625ec297acc0375f82e19b
  - Linux >= 5.10.190 < 5.11
  - Linux 5.12
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-05T19:48:50.466595Z'
published: '2025-05-01'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T19:49:49.816Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2022-49801'
references:
  - url: 'https://git.kernel.org/stable/c/2c21ee020ce43d744ecd7f3e9bddfcaafef270ce'
  - url: 'https://git.kernel.org/stable/c/a7d3f8f33c113478737bc61bb32ec5f9a987da7d'
  - url: 'https://git.kernel.org/stable/c/649e72070cbbb8600eb823833e4748f5a0815116'
tags:
  - cve.org
epss: 0.00199
epssPercentile: 0.09812
ingestedAt: '2026-11-05T22:38:31.599Z'
---

## Overview

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

tracing: Fix memory leak in tracing_read_pipe()

kmemleak reports this issue:

unreferenced object 0xffff888105a18900 (size 128):
  comm "test_progs", pid 18933, jiffies 4336275356 (age 22801.766s)
  hex dump (first 32 bytes):
    25 73 00 90 81 88 ff ff 26 05 00 00 42 01 58 04  %s......&...B.X.
    03 00 00 00 02 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<00000000560143a1>] __kmalloc_node_track_caller+0x4a/0x140
    [<000000006af00822>] krealloc+0x8d/0xf0
    [<00000000c309be6a>] trace_iter_expand_format+0x99/0x150
    [<000000005a53bdb6>] trace_check_vprintf+0x1e0/0x11d0
    [<0000000065629d9d>] trace_event_printf+0xb6/0xf0
    [<000000009a690dc7>] trace_raw_output_bpf_trace_printk+0x89/0xc0
    [<00000000d22db172>] print_trace_line+0x73c/0x1480
    [<00000000cdba76ba>] tracing_read_pipe+0x45c/0x9f0
    [<0000000015b58459>] vfs_read+0x17b/0x7c0
    [<000000004aeee8ed>] ksys_read+0xed/0x1c0
    [<0000000063d3d898>] do_syscall_64+0x3b/0x90
    [<00000000a06dda7f>] entry_SYSCALL_64_after_hwframe+0x63/0xcd

iter->fmt alloced in
  tracing_read_pipe() -> .. ->trace_iter_expand_format(), but not
freed, to fix, add free in tracing_release_pipe()

## Affected

- `Linux >= efbbdaa22bb78761bff8dfdde027ad04bedd47ce < 2c21ee020ce43d744ecd7f3e9bddfcaafef270ce`
- `Linux >= efbbdaa22bb78761bff8dfdde027ad04bedd47ce < a7d3f8f33c113478737bc61bb32ec5f9a987da7d`
- `Linux >= efbbdaa22bb78761bff8dfdde027ad04bedd47ce < 649e72070cbbb8600eb823833e4748f5a0815116`
- `Linux 840ce9cfc86f89c335625ec297acc0375f82e19b`
- `Linux >= 5.10.190 < 5.11`
- `Linux 5.12`

## Remediation

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