Linux Kernel up to 6.17.3 net sctp_sf_do_5_1D_ce 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 classified as critical has been found in Linux Kernel up to 6.17.3. The affected element is the function sctp_sf_do_5_1D_ce of the component net. The manipulation leads to null pointer dereference. This vulnerability is documented as CVE-2025-40187. There is not any exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.17.3. It has been rated as critical. This issue affects the function sctp_sf_do_5_1D_ce of the component net. 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: net/sctp: fix a null dereference in sctp_disposition sctp_sf_do_5_1D_ce() If new_asoc->peer.adaptation_ind=0 and sctp_ulpevent_make_authkey=0 and sctp_ulpevent_make_authkey() returns 0, then the variable ai_ev remains zero and the zero will be dereferenced in the sctp_ulpevent_free() function.

The advisory is shared at git.kernel.org. The identification of this vulnerability is CVE-2025-40187 since 04/16/2025. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 276782 (Debian dla-4379 : linux-config-6.1 - security update), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.4.301, 5.10.246, 5.15.195, 6.1.157, 6.6.113, 6.12.54, 6.17.4 or 6.18-rc1 eliminates this vulnerability. Applying the patch 1014b83778c8677f1d7a57c26dc728baa801ac62/7f702f85df0266ed7b5bab81ba50394c92f3c928/dbceedc0213e75bf3e9f9f9e2f66b10699d004fe/c21f45cfa4a9526b34d76b397c9ef080668b6e73/d0e8f1445c19b1786759ba72a38267e1449bab7e/badbd79313e6591616c1b78e29a9b71efed7f035/2f3119686ef50319490ccaec81a575973da98815 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 (276782) and CERT Bund (WID-SEC-2025-2595). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Affected

  • Google Container-Optimized OS
  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • SUSE Linux
  • Oracle Linux
  • SUSE openSUSE
  • Open Source Linux Kernel
  • RESF Rocky Linux

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.7
VulDB Meta Temp Score: 5.5

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

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: No
Local: No
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 276782
Nessus Name: Debian dla-4379 : linux-config-6.1 - security update

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.4.301/5.10.246/5.15.195/6.1.157/6.6.113/6.12.54/6.17.4/6.18-rc1
Patch: 1014b83778c8677f1d7a57c26dc728baa801ac62/7f702f85df0266ed7b5bab81ba50394c92f3c928/dbceedc0213e75bf3e9f9f9e2f66b10699d004fe/c21f45cfa4a9526b34d76b397c9ef080668b6e73/d0e8f1445c19b1786759ba72a38267e1449bab7e/badbd79313e6591616c1b78e29a9b71efed7f035/2f3119686ef50319490ccaec81a575973da98815

Timelineinfo

04/16/2025 CVE reserved
11/13/2025 +211 days Advisory disclosed
11/13/2025 +0 days VulDB entry created
02/07/2026 +86 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2025-40187 (🔒)
GCVE (CVE): GCVE-0-2025-40187
GCVE (VulDB): GCVE-100-332261
CERT Bund: WID-SEC-2025-2595 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 11/13/2025 07:31
Updated: 02/07/2026 20:15
Changes: 11/13/2025 07:31 (59), 11/13/2025 18:57 (7), 11/28/2025 23:34 (2), 12/01/2025 14:10 (1), 12/21/2025 22:01 (1), 02/07/2026 20:15 (1)
Complete: 🔍
Cache ID: 216::103

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