---
id: CVE-2023-6915
title: 'Kernel: null pointer dereference vulnerability in ida_free in lib/idr.c'
summary: >-
  A Null pointer dereference problem was found in ida_free in lib/idr.c in the
  Linux Kernel. This issue may allow an attacker using this library to cause a
  denial of service problem due to a missing check at a function return.
severity: medium
cvss: 6.2
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-476
vendor: Red Hat
product: kernel-rt
affected:
  - kernel-rt (all versions)
  - kernel (all versions)
  - kernel (all versions)
  - kernel (all versions)
  - kernel
  - kernel
  - kernel-rt
  - kernel-rt (all versions)
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2025-06-17T20:13:23.064257Z'
published: '2024-01-15'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T11:37:55.195Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2023-6915'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2024:2394'
    label: 'RHSA-2024:2394'
  - url: 'https://access.redhat.com/errata/RHSA-2024:2950'
    label: 'RHSA-2024:2950'
  - url: 'https://access.redhat.com/errata/RHSA-2024:3138'
    label: 'RHSA-2024:3138'
  - url: 'https://access.redhat.com/security/cve/CVE-2023-6915'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2254982'
    label: RHBZ#2254982
  - url: >-
      https://github.com/torvalds/linux/commit/af73483f4e8b6f5c68c9aa63257bdd929a9c194a
tags:
  - cve.org
epss: 0.00278
epssPercentile: 0.20316
ingestedAt: '2026-11-05T21:36:00.814Z'
---

## Overview

A Null pointer dereference problem was found in ida_free in lib/idr.c in the Linux Kernel. This issue may allow an attacker using this library to cause a denial of service problem due to a missing check at a function return.

## Affected

- `kernel-rt (all versions)`
- `kernel (all versions)`
- `kernel (all versions)`
- `kernel (all versions)`
- `kernel`
- `kernel`
- `kernel-rt`
- `kernel-rt (all versions)`

## Remediation

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

### Workarounds

Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.