CVE-2026-74730: NFS: Pin the 'struct nfs_server' during a FREE_STATEID call

mediumCVSS 5.9CVE-2026-74730

CSIRTS triage

vendor: Linux product: Linux Denial of service

What: NFS does not pin the nfs_server structure during FREE_STATEID calls, risking use-after-free or reference counting errors.
Who is affected: Linux systems using NFS client functionality.
Urgency: Moderate; CVSS 5.9 and use-after-free potential warrant prompt patching.
Action: Apply kernel patch or upgrade to a Linux version with NFS stateid locking fix.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: medium — CVSS 5.9
Published: 2026-08-11
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-74730

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-747300.19% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 9% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-74730	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

criticalCVE-2026-74730: In the Linux kernel, the following vulnerability has been resolved: NFS: Pin the 'struct nfs_s…nvd

Recent advisories for NFS

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

criticalCVE-2026-74730: In the Linux kernel, the following vulnerability has been resolved: NFS: Pin the 'struct nfs_s…nvd · 2026-08-22
highCVE-2026-16686: IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a remote attacker to access NFS-expo…nvd · 2026-08-19
criticalCVE-2026-72472: In the Linux kernel, the following vulnerability has been resolved: nfs: use nfsi->rwsem to pr…nvd · 2026-08-15
unknownCVE-2026-72132: In the Linux kernel, the following vulnerability has been resolved: NFS: Charge unstable write…nvd · 2026-08-15
mediumCVE-2026-72472: nfs: use nfsi->rwsem to protect traversal of the file lock listmsrc · 2026-08-11
criticalCVE-2026-63800: In the Linux kernel, the following vulnerability has been resolved: pNFS: Fix use-after-free i…nvd · 2026-07-19