---
id: CVE-2023-53075
title: 'ftrace: Fix invalid address access in lookup_rec() when index is 0'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ftrace: Fix invalid address access in lookup_rec() when index is 0

  KASAN reported follow problem:

   BUG: KASAN: use-after-free in lookup_rec
   Read of size 8 at addr ff…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 9644302e3315e7e36495d230d5ac7125a316d33e <
    2de28e5ce34b22b73b833a21e2c45ae3aade3964
  - >-
    Linux >= 9644302e3315e7e36495d230d5ac7125a316d33e <
    7569ee04b0e3b32df79f64db3a7138573edad9bc
  - >-
    Linux >= 9644302e3315e7e36495d230d5ac7125a316d33e <
    ac58b88ccbbb8e9fb83e137cee04a856b1ea6635
  - >-
    Linux >= 9644302e3315e7e36495d230d5ac7125a316d33e <
    83c3b2f4e7c61367c7b24551f4c6eb94bbdda283
  - >-
    Linux >= 9644302e3315e7e36495d230d5ac7125a316d33e <
    2a0d71fabfeb349216d33f001a6421b1768bd3a9
  - >-
    Linux >= 9644302e3315e7e36495d230d5ac7125a316d33e <
    4f84f31f63416b0f02fc146ffdc4ab32723eb7e8
  - >-
    Linux >= 9644302e3315e7e36495d230d5ac7125a316d33e <
    f1bd8b7fd890d87d0dc4dedc6287ea34dd07c0b4
  - >-
    Linux >= 9644302e3315e7e36495d230d5ac7125a316d33e <
    ee92fa443358f4fc0017c1d0d325c27b37802504
  - Linux 3.5
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-05T20:16:30.131235Z'
published: '2025-05-02'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T20:20:58.969Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2023-53075'
references:
  - url: 'https://git.kernel.org/stable/c/2de28e5ce34b22b73b833a21e2c45ae3aade3964'
  - url: 'https://git.kernel.org/stable/c/7569ee04b0e3b32df79f64db3a7138573edad9bc'
  - url: 'https://git.kernel.org/stable/c/ac58b88ccbbb8e9fb83e137cee04a856b1ea6635'
  - url: 'https://git.kernel.org/stable/c/83c3b2f4e7c61367c7b24551f4c6eb94bbdda283'
  - url: 'https://git.kernel.org/stable/c/2a0d71fabfeb349216d33f001a6421b1768bd3a9'
  - url: 'https://git.kernel.org/stable/c/4f84f31f63416b0f02fc146ffdc4ab32723eb7e8'
  - url: 'https://git.kernel.org/stable/c/f1bd8b7fd890d87d0dc4dedc6287ea34dd07c0b4'
  - url: 'https://git.kernel.org/stable/c/ee92fa443358f4fc0017c1d0d325c27b37802504'
tags:
  - cve.org
epss: 0.00206
epssPercentile: 0.10716
ingestedAt: '2026-11-05T22:38:31.764Z'
---

## Overview

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

ftrace: Fix invalid address access in lookup_rec() when index is 0

KASAN reported follow problem:

 BUG: KASAN: use-after-free in lookup_rec
 Read of size 8 at addr ffff000199270ff0 by task modprobe
 CPU: 2 Comm: modprobe
 Call trace:
  kasan_report
  __asan_load8
  lookup_rec
  ftrace_location
  arch_check_ftrace_location
  check_kprobe_address_safe
  register_kprobe

When checking pg->records[pg->index - 1].ip in lookup_rec(), it can get a
pg which is newly added to ftrace_pages_start in ftrace_process_locs().
Before the first pg->index++, index is 0 and accessing pg->records[-1].ip
will cause this problem.

Don't check the ip when pg->index is 0.

## Affected

- `Linux >= 9644302e3315e7e36495d230d5ac7125a316d33e < 2de28e5ce34b22b73b833a21e2c45ae3aade3964`
- `Linux >= 9644302e3315e7e36495d230d5ac7125a316d33e < 7569ee04b0e3b32df79f64db3a7138573edad9bc`
- `Linux >= 9644302e3315e7e36495d230d5ac7125a316d33e < ac58b88ccbbb8e9fb83e137cee04a856b1ea6635`
- `Linux >= 9644302e3315e7e36495d230d5ac7125a316d33e < 83c3b2f4e7c61367c7b24551f4c6eb94bbdda283`
- `Linux >= 9644302e3315e7e36495d230d5ac7125a316d33e < 2a0d71fabfeb349216d33f001a6421b1768bd3a9`
- `Linux >= 9644302e3315e7e36495d230d5ac7125a316d33e < 4f84f31f63416b0f02fc146ffdc4ab32723eb7e8`
- `Linux >= 9644302e3315e7e36495d230d5ac7125a316d33e < f1bd8b7fd890d87d0dc4dedc6287ea34dd07c0b4`
- `Linux >= 9644302e3315e7e36495d230d5ac7125a316d33e < ee92fa443358f4fc0017c1d0d325c27b37802504`
- `Linux 3.5`

## Remediation

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