CVE-2026-74730
In the Linux kernel, the following vulnerability has been resolved:
NFS: Pin the 'struct nfs_server' during a FREE_STATEID call
Dan Aloni reports that he was able to hit a use-after-free bug if a
FREE_STATEID operation gets delayed for whatever reason. Fix this by
bumping the refcount of the 'struct nfs_server' object for the duration
of the FREE_STATEID so it doesn't get cleaned up from underneath us
while operations are still in flight.
CSIRTS triage
- 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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Exploitation outlook
- Low exploitation risk0.19% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 9% of all EPSS-scored CVEs.
Advisory coverage (2)
- criticalCVE-2026-74730: In the Linux kernel, the following vulnerability has been resolved: NFS: Pin the 'struct nfs_s…nvd · 2026-08-22
- mediumCVE-2026-74730: NFS: Pin the 'struct nfs_server' during a FREE_STATEID callmsrc · 2026-08-11
External references
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