CVE-2025-40129 Details
Description
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.
A null pointer dereference vulnerability has been identified in the Linux kernel's SUNRPC module, specifically within the GSS-API authentication handling. This issue arises when the checksum length is zero, leading to a null checksum data pointer. The vulnerability is present in the stable Linux kernel versions that include this flawed authentication processing. When the null pointer is accessed during message integrity verification, it causes a crash, creating a denial-of-service condition.
Users can upgrade to the latest stable version of the Linux kernel, where this vulnerability has been patched. Instructions for downloading the updated kernel can be found on the Linux Kernel Archives.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Nov 12, 2025References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/6df164e29bd4e6505c5a2e0e5f1e1f6957a16a42 | kernel.org | Source CodeVendor |
| https://git.kernel.org/stable/c/81cec07d303186d0d8c623ef8b5ecd3b81e94cf6 | kernel.org | Source CodeVendor |
| https://git.kernel.org/stable/c/ab9a70cd2386a0d70c164b0905dd66bc9af52e77 | kernel.org | Source CodeVendor |
| https://git.kernel.org/stable/c/affc03d44921f493deaae1d33151e3067a6f9f8f | kernel.org | Source CodeVendor |
Weakness Enumeration
No weakness enumeration is available for this CVE.
Affected Products
| Product | Versions |
|---|---|
| Linux kernel | All versions |
CPE
Remediation
| |
Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 30, 2026 | CVE Modified | kernel.org |
| Jun 17, 2026 | CVE Modified | kernel.org |
| Nov 12, 2025 | New CVE Received | kernel.org |