Linux Kernel up to 6.12.4 cache_set_flush null pointer dereference

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5.5	$0-$5k	0.00

Summaryinfo

A vulnerability, which was classified as critical, has been found in Linux Kernel up to 6.12.4. Affected by this issue is the function cache_set_flush. The manipulation leads to null pointer dereference. This vulnerability is referenced as CVE-2024-48881. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Linux Kernel up to 6.12.4. This issue affects the function cache_set_flush. The manipulation with an unknown input leads to a null pointer dereference vulnerability. Using CWE to declare the problem leads to CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. Impacted is availability. The summary by CVE is:

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.

It is possible to read the advisory at git.kernel.org. The identification of this vulnerability is CVE-2024-48881 since 01/09/2025. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 214901 (SUSE SLES15 Security Update : kernel (SUSE-SU-2025:0289-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.4.287, 5.10.231, 5.15.174, 6.1.120, 6.6.66 or 6.12.5 eliminates this vulnerability. Applying the patch 4379c5828492a4c2a651c8f826a01453bd2b80b0/336e30f32ae7c043fde0f6fa21586ff30bea9fe2/fb5fee35bdd18316a84b5f30881a24e1415e1464/5202391970ffbf81975251b3526b890ba027b715/cc05aa2c0117e20fa25a3c0d915f98b8f2e78667/5e0e913624bcd24f3de414475018d3023f060ee1/b2e382ae12a63560fca35050498e19e760adf8c0 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (214901) and CERT Bund (WID-SEC-2025-0047). Be aware that VulDB is the high quality source for vulnerability data.

Affected

• Debian Linux
• Amazon Linux 2
• Red Hat Enterprise Linux
• Ubuntu Linux
• SUSE Linux
• Oracle Linux
• RESF Rocky Linux
• Dell NetWorker
• Dell Avamar
• Red Hat OpenShift
• IBM QRadar SIEM
• Dell PowerProtect Data Domain
• Open Source Linux Kernel
• Dell Secure Connect Gateway

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 5.4.286
• 5.10.230
• 5.15.173
• 6.1.119
• 6.6.0
• 6.6.1
• 6.6.2
• 6.6.3
• 6.6.4
• 6.6.5
• 6.6.6
• 6.6.7
• 6.6.8
• 6.6.9
• 6.6.10
• 6.6.11
• 6.6.12
• 6.6.13
• 6.6.14
• 6.6.15
• 6.6.16
• 6.6.17
• 6.6.18
• 6.6.19
• 6.6.20
• 6.6.21
• 6.6.22
• 6.6.23
• 6.6.24
• 6.6.25
• 6.6.26
• 6.6.27
• 6.6.28
• 6.6.29
• 6.6.30
• 6.6.31
• 6.6.32
• 6.6.33
• 6.6.34
• 6.6.35
• 6.6.36
• 6.6.37
• 6.6.38
• 6.6.39
• 6.6.40
• 6.6.41
• 6.6.42
• 6.6.43
• 6.6.44
• 6.6.45
• 6.6.46
• 6.6.47
• 6.6.48
• 6.6.49
• 6.6.50
• 6.6.51
• 6.6.52
• 6.6.53
• 6.6.54
• 6.6.55
• 6.6.56
• 6.6.57
• 6.6.58
• 6.6.59
• 6.6.60
• 6.6.61
• 6.6.62
• 6.6.63
• 6.6.64
• 6.6.65
• 6.12.0
• 6.12.1
• 6.12.2
• 6.12.3
• 6.12.4

License

• open-source

Website

• Vendor: https://www.kernel.org/

CPE 2.3info

• 🔍
• 🔍
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CPE 2.2info

• 🔍
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CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.6
VulDB Meta Temp Score: 5.5

VulDB Base Score: 5.7
VulDB Temp Score: 5.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 214901
Nessus Name: SUSE SLES15 Security Update : kernel (SUSE-SU-2025:0289-1)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Kernel 5.4.287/5.10.231/5.15.174/6.1.120/6.6.66/6.12.5
Patch: 4379c5828492a4c2a651c8f826a01453bd2b80b0/336e30f32ae7c043fde0f6fa21586ff30bea9fe2/fb5fee35bdd18316a84b5f30881a24e1415e1464/5202391970ffbf81975251b3526b890ba027b715/cc05aa2c0117e20fa25a3c0d915f98b8f2e78667/5e0e913624bcd24f3de414475018d3023f060ee1/b2e382ae12a63560fca35050498e19e760adf8c0

Timelineinfo

01/09/2025 🔍
01/11/2025 +2 days 🔍
01/11/2025 +0 days 🔍
01/25/2026 +379 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2024-48881 (🔍)
GCVE (CVE): GCVE-0-2024-48881
GCVE (VulDB): GCVE-100-291215
CERT Bund: WID-SEC-2025-0047 - Linux Kernel: Mehrere Schwachstellen ermöglichen Denial of Service

Entryinfo

Created: 01/11/2025 14:11
Updated: 01/25/2026 19:12
Changes: 01/11/2025 14:11 (58), 02/01/2025 03:17 (11), 02/04/2025 13:09 (2), 01/25/2026 19:12 (7)
Complete: 🔍
Cache ID: 216::103

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