Linux Kernel up to 6.6.111/6.12.52/6.17.2 sunrpc xdr_stream_decode_opaque_auth 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 6.6.111/6.12.52/6.17.2 and classified as critical. This impacts the function xdr_stream_decode_opaque_auth of the component sunrpc. The manipulation results in null pointer dereference. This vulnerability is cataloged as CVE-2025-40129. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in Linux Kernel up to 6.6.111/6.12.52/6.17.2. Affected is the function xdr_stream_decode_opaque_auth of the component sunrpc. The manipulation with an unknown input leads to a null pointer dereference vulnerability. CWE is classifying the issue as 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. This is going to have an impact on availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: sunrpc: fix null pointer dereference on zero-length checksum In xdr_stream_decode_opaque_auth(), zero-length checksum.len causes checksum.data to be set to NULL. This triggers a NPD when accessing checksum.data in gss_krb5_verify_mic_v2(). This patch ensures that the value of checksum.len is not less than XDR_UNIT.

The advisory is available at git.kernel.org. This vulnerability is traded as CVE-2025-40129 since 04/16/2025. Technical details are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 299046 (SUSE SLES15 Security Update : kernel RT (Live Patch 3 for SUSE Linux Enterprise 15 SP7) (SUSE-SU-2026:0490-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.6.112, 6.12.53, 6.17.3 or 6.18-rc1 eliminates this vulnerability. Applying the patch 81cec07d303186d0d8c623ef8b5ecd3b81e94cf6/affc03d44921f493deaae1d33151e3067a6f9f8f/ab9a70cd2386a0d70c164b0905dd66bc9af52e77/6df164e29bd4e6505c5a2e0e5f1e1f6957a16a42 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 (299046) and CERT Bund (WID-SEC-2025-2579). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Affected

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

Productinfo

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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: 299046
Nessus Name: SUSE SLES15 Security Update : kernel RT (Live Patch 3 for SUSE Linux Enterprise 15 SP7) (SUSE-SU-2026:0490-1)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.6.112/6.12.53/6.17.3/6.18-rc1
Patch: 81cec07d303186d0d8c623ef8b5ecd3b81e94cf6/affc03d44921f493deaae1d33151e3067a6f9f8f/ab9a70cd2386a0d70c164b0905dd66bc9af52e77/6df164e29bd4e6505c5a2e0e5f1e1f6957a16a42

Timelineinfo

04/16/2025 CVE reserved
11/12/2025 +210 days Advisory disclosed
11/12/2025 +0 days VulDB entry created
02/14/2026 +94 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2025-40129 (🔒)
GCVE (CVE): GCVE-0-2025-40129
GCVE (VulDB): GCVE-100-332154
CERT Bund: WID-SEC-2025-2579 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 11/12/2025 13:33
Updated: 02/14/2026 18:40
Changes: 11/12/2025 13:33 (59), 12/18/2025 01:31 (7), 12/30/2025 14:52 (1), 02/08/2026 01:03 (1), 02/14/2026 18:40 (2)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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