What’s Vulnerable › Vulnerabilities

CVE-2025-38430: nfsd: nfsd4_spo_must_allow() must check this is a v4 compound request

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-07-25 · updated 2026-10-15

Description

In the Linux kernel, the following vulnerability has been resolved: nfsd: nfsd4_spo_must_allow() must check this is a v4 compound request If the request being processed is not a v4 compound request, then examining the cstate can have undefined results. This patch adds a check that the rpc procedure being executed (rq_procinfo) is the NFSPROC4_COMPOUND procedure.

Affected products

• Debian Linux: 11.0
• Linux kernel: before 5.4.295; from 5.5 before 5.10.239; from 5.11 before 5.15.186; from 5.16 before 6.1.142; from 6.2 before 6.6.95; from 6.7 before 6.12.35 — fixed in 5.10.239, 5.15.186, 5.4.295, 6.1.142, 6.12.35, 6.15.4

How to fix

Upgrade to a fixed version: Linux kernel 5.10.239, 5.15.186, 5.4.295, 6.1.142. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/1244f0b2c3cecd3f349a877006e67c9492b41807
• https://git.kernel.org/stable/c/2c54bd5a380ebf646fb9efbc4ae782ff3a83a5af
• https://git.kernel.org/stable/c/425efc6b3292a3c79bfee4a1661cf043dcd9cf2f
• https://git.kernel.org/stable/c/64a723b0281ecaa59d31aad73ef8e408a84cb603
• https://git.kernel.org/stable/c/7a75a956692aa64211a9e95781af1ec461642de4
• https://git.kernel.org/stable/c/b1d0323a09a29f81572c7391e0d80d78724729c9
• https://git.kernel.org/stable/c/bf78a2706ce975981eb5167f2d3b609eb5d24c19
• https://git.kernel.org/stable/c/e7e943ddd1c6731812357a28e7954ade3a7d8517
• https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
• https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
• https://cert-portal.siemens.com/productcert/html/ssa-082556.html

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