---
id: CVE-2024-48881
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  bcache: revert replacing IS_ERR_OR_NULL with IS_ERR again

  Commit 028ddcac477b ("bcache: Remove unnecessary NULL point check in
  node allocations") leads a NULL pointer …
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  bcache: revert replacing IS_ERR_OR_NULL with IS_ERR again

  Commit 028ddcac477b ("bcache: Remove unnecessary NULL point check in
  node allocations") leads a NULL pointer …
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-476
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 4.19.291, < 4.20'
  - 'linux_kernel >= 5.4.251, < 5.4.287'
  - 'linux_kernel >= 5.10.188, < 5.10.231'
  - 'linux_kernel >= 5.15.121, < 5.15.174'
  - 'linux_kernel >= 6.1.39, < 6.1.120'
  - 'linux_kernel >= 6.4.4, < 6.6.66'
  - 'linux_kernel >= 6.7, < 6.12.5'
  - linux_kernel = 6.13
patched:
  - linux_kernel 6.12.5
published: '2025-01-11'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T01:18:58.480'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2024-48881'
references:
  - url: 'https://git.kernel.org/stable/c/336e30f32ae7c043fde0f6fa21586ff30bea9fe2'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/4379c5828492a4c2a651c8f826a01453bd2b80b0'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/5202391970ffbf81975251b3526b890ba027b715'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/5e0e913624bcd24f3de414475018d3023f060ee1'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b2e382ae12a63560fca35050498e19e760adf8c0'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/cc05aa2c0117e20fa25a3c0d915f98b8f2e78667'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/fb5fee35bdd18316a84b5f30881a24e1415e1464'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-355557.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-398330.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
  - cve.org
epss: 0.00261
epssPercentile: 0.17699
ingestedAt: '2026-10-15T03:30:12.777Z'
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2025-10-01T19:55:37.185480Z'
---

## Overview

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

bcache: revert replacing IS_ERR_OR_NULL with IS_ERR again

Commit 028ddcac477b ("bcache: Remove unnecessary NULL point check in
node allocations") leads a NULL pointer deference in cache_set_flush().

1721         if (!IS_ERR_OR_NULL(c->root))
1722                 list_add(&c->root->list, &c->btree_cache);

>From the above code in cache_set_flush(), if previous registration code
fails before allocating c->root, it is possible c->root is NULL as what
it is initialized. __bch_btree_node_alloc() never returns NULL but
c->root is possible to be NULL at above line 1721.

This patch replaces IS_ERR() by IS_ERR_OR_NULL() to fix this.

## Affected

- `linux_kernel >= 4.19.291, < 4.20`
- `linux_kernel >= 5.4.251, < 5.4.287`
- `linux_kernel >= 5.10.188, < 5.10.231`
- `linux_kernel >= 5.15.121, < 5.15.174`
- `linux_kernel >= 6.1.39, < 6.1.120`
- `linux_kernel >= 6.4.4, < 6.6.66`
- `linux_kernel >= 6.7, < 6.12.5`
- `linux_kernel = 6.13`

## Remediation

Upgrade past the affected range:

- `linux_kernel 6.12.5`