Is CVE-2026-74730 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-74730 being exploited in the wild.

How severe is CVE-2026-74730?

Critical severity, with a CVSS score of 9.8, published 22 August 2026.

Which products and versions are affected?

Linux Kernel multiple versions (see NVD for full list).

Is there a fix for CVE-2026-74730?

A patch was published on 2026-06-30: Upstream commit cf616096a0f3a2b60f7d68b6b39674a6867ded9c by Anna Schumaker Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-74730 attacked?

It is attacked over the network, in an operating system.

Am I affected by CVE-2026-74730?

Check whether you run Linux Kernel at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-74730: Linux kernel NFS use-after-free in FREE_STATEID

CVE-2026-74730 · Severity: critical · CVSS 9.8 · Published 2026-08-22

A use-after-free vulnerability exists in the Linux kernel's NFS (Network File System) implementation during FREE_STATEID operations. When a FREE_STATEID call is delayed, the kernel can attempt to access server structures that have already been cleaned up, potentially causing a system crash or allowing an attacker with network access to trigger a denial of service against NFS servers.

Technologies: Linux Kernel. Vendors: Linux.

Quick answers

Is CVE-2026-74730 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-74730 being exploited in the wild.
How severe is CVE-2026-74730?: Critical severity, with a CVSS score of 9.8, published 22 August 2026.
Which products and versions are affected?: Linux Kernel multiple versions (see NVD for full list).
Is there a fix for CVE-2026-74730?: A patch was published on 2026-06-30: Upstream commit cf616096a0f3a2b60f7d68b6b39674a6867ded9c by Anna Schumaker Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-74730 attacked?: It is attacked over the network, in an operating system.
Am I affected by CVE-2026-74730?: Check whether you run Linux Kernel at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The vulnerability is a use-after-free bug in the NFS v4 protocol handler (fs/nfs/nfs4proc.c), specifically in the nfs41_free_stateid() function. The root cause is that the 'struct nfs_server' reference is not pinned during asynchronous FREE_STATEID RPC operations; if the operation is delayed, the server structure can be deallocated while the RPC is still in flight. The fix increments the reference count of the nfs_server object at the start of FREE_STATEID (via nfs_sb_active()) and decrements it during cleanup (via nfs_sb_deactive()), ensuring the structure remains valid for the duration of the operation. The attack vector is network-based and requires the ability to trigger or delay NFS operations; no authentication is required beyond standard NFS access.

Affected products

Linux Linux kernel multiple versions (see NVD for full list)

Timeline

2026-08-22: disclosed
2026-06-30: patched: Upstream commit cf616096a0f3a2b60f7d68b6b39674a6867ded9c by Anna Schumaker

References

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