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CVE-2025-40129

sunrpc: fix null pointer dereference on zero-length checksum

HIGH
7.5
CVSS Score
Published: November 12, 2025 at 10:23 AM UTC
Updated: October 19, 2026 at 09:10 PM UTC
1 product affected across 1 vendorLinux Kernel

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Severity
HIGH7.5
Exploit prediction
EPSS 0.6%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel· Linux
90%
0653028e8f1c97fec30710813a001ad8a2ec34f46.3653028e8f1c97fec30710813a1ad8a2ec34f4
Vendor states this is fixed in 6df164e29bd4e6505c5a2e0e5f1e1f6957a16a42 (fixed)
Vendor states this is fixed in 81cec07d303186d0d8c623ef8b5ecd3b81e94cf6 (fixed)
Vendor states this is fixed in ab9a70cd2386a0d70c164b0905dd66bc9af52e77 (fixed)
Vendor states this is fixed in affc03d44921f493deaae1d33151e3067a6f9f8f (fixed)
Vendor states this is fixed in 6.12.53 (unaffected)
Vendor states this is fixed in 6.17.3 (unaffected)
Vendor states this is fixed in 6.18 (unaffected)
Vendor states this is fixed in 6.3 (unaffected)
Vendor states this is fixed in 6.6.112 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (4)

Source: cverecord
https://git.kernel.org/stable/c/81cec07d303186d0d8c623ef8b5ecd3b81e94cf6
Source: cverecord
https://git.kernel.org/stable/c/affc03d44921f493deaae1d33151e3067a6f9f8f
Source: cverecord
https://git.kernel.org/stable/c/ab9a70cd2386a0d70c164b0905dd66bc9af52e77
Source: cverecord
https://git.kernel.org/stable/c/6df164e29bd4e6505c5a2e0e5f1e1f6957a16a42

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHLinux
Vector?

Quick Info

StatusDEFERRED

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