Linux Kernel up to 6.16.5 add_interval null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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5.5$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.16.5. It has been declared as critical. This impacts the function add_interval. Executing a manipulation can lead to null pointer dereference. This vulnerability is registered as CVE-2025-39920. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.16.5. It has been declared as critical. This vulnerability affects the function add_interval. The manipulation with an unknown input leads to a null pointer dereference vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: pcmcia: Add error handling for add_interval() in do_validate_mem() In the do_validate_mem(), the call to add_interval() does not handle errors. If kmalloc() fails in add_interval(), it could result in a null pointer being inserted into the linked list, leading to illegal memory access when sub_interval() is called next. This patch adds an error handling for the add_interval(). If add_interval() returns an error, the function will return early with the error code.

The advisory is shared for download at git.kernel.org. This vulnerability was named CVE-2025-39920 since 04/16/2025. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 277579 (Ubuntu Pro FIPS-updates 22.04 LTS : Linux kernel (Azure FIPS) vulnerabilities (USN-7910-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.4.299, 5.10.243, 5.15.192, 6.1.151, 6.6.105, 6.12.46 or 6.16.6 eliminates this vulnerability. Applying the patch 5b60ed401b47897352c520bc724c85aa908dedcc/ae184024ef31423e5beb44cf4f52999bbcf2fe5b/85be7ef8c8e792a414940a38d94565dd48d2f236/06b26e3099207c94b3d1be8565aedc6edc4f0a60/8699358b6ac99b8ccc97ed9e6e3669ef8958ef7b/289b58f8ff3198d091074a751d6b8f6827726f3e/369bf6e241506583f4ee7593c53b92e5a9f271b4/4a81f78caa53e0633cf311ca1526377d9bff7479 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 (277579), EUVD (EUVD-2025-31831) and CERT Bund (WID-SEC-2025-2170). Once again VulDB remains the best source for vulnerability data.

Affected

  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • SUSE openSUSE
  • RESF Rocky Linux
  • Open Source Linux Kernel
  • Dell Secure Connect Gateway

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

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

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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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: 🔒

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Nessus ID: 277579
Nessus Name: Ubuntu Pro FIPS-updates 22.04 LTS : Linux kernel (Azure FIPS) vulnerabilities (USN-7910-1)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.4.299/5.10.243/5.15.192/6.1.151/6.6.105/6.12.46/6.16.6
Patch: 5b60ed401b47897352c520bc724c85aa908dedcc/ae184024ef31423e5beb44cf4f52999bbcf2fe5b/85be7ef8c8e792a414940a38d94565dd48d2f236/06b26e3099207c94b3d1be8565aedc6edc4f0a60/8699358b6ac99b8ccc97ed9e6e3669ef8958ef7b/289b58f8ff3198d091074a751d6b8f6827726f3e/369bf6e241506583f4ee7593c53b92e5a9f271b4/4a81f78caa53e0633cf311ca1526377d9bff7479

Timelineinfo

04/16/2025 CVE reserved
10/01/2025 +168 days Advisory disclosed
10/01/2025 +0 days VulDB entry created
01/16/2026 +107 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2025-39920 (🔒)
GCVE (CVE): GCVE-0-2025-39920
GCVE (VulDB): GCVE-100-326500
EUVD: 🔒
CERT Bund: WID-SEC-2025-2170 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 10/01/2025 10:26
Updated: 01/16/2026 20:57
Changes: 10/01/2025 10:26 (58), 10/01/2025 13:49 (1), 10/01/2025 21:26 (7), 11/25/2025 06:18 (1), 12/01/2025 18:54 (1), 12/06/2025 09:30 (2), 01/08/2026 19:33 (1), 01/16/2026 20:57 (10)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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