Bug 2414517 (CVE-2025-40129) - CVE-2025-40129 kernel: sunrpc: fix null pointer dereference on zero-length checksum
Summary: CVE-2025-40129 kernel: sunrpc: fix null pointer dereference on zero-length ch...
Keywords:
Status: NEW
Alias: CVE-2025-40129
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
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Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2025-11-12 11:04 UTC by OSIDB Bzimport
Modified: 2025-11-13 13:06 UTC (History)
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Description OSIDB Bzimport 2025-11-12 11:04:59 UTC 
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.
Comment 1 Alexander B 2025-11-13 13:03:15 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025111254-CVE-2025-40129-fbb4@gregkh/T
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