CVE-2026-90038

9.8 CRITICAL

Published 2026-09-16 · Updated 2026-09-16

AI risk analysis

Summary: This flaw allows a client to use an already freed resource during export state revocation, leading to potential memory corruption or privilege escalation.
Exploitability: Exploitation requires racing with the kernel's teardown process and is moderately difficult due to timing constraints.
Blast radius: If exploited, it could lead to system instability, data corruption, or unauthorized access to sensitive resources.
Prioritized remediation: Update to the latest Linux kernel version that addresses this vulnerability.

kerneluse-after-freesecurity

Analysis generated locally by qwen2.5:7b-instruct (no data left the box). AI-assisted — verify against primary sources before acting.

NVD description

In the Linux kernel, the following vulnerability has been resolved: NFSD: Prevent client use-after-free during export state revocation nfsd4_revoke_export_states() has the same use-after-free as nfsd4_revoke_states(): it drops nn->client_lock across revoke_one_stid() and the following read of clp->cl_minorversion, but the stateid reference it holds does not pin the client. A teardown racing the dropped lock can free the client while revoke_one_stid() still dereferences it. exportfs -u drives this path through NFSD_CMD_UNLOCK_EXPORT, so an administrator removing an export can race a client expiry. Skip a client that is already expiring and otherwise pin it with cl_rpc_users under client_lock before dropping the lock, matching nfsd4_revoke_states().

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

All references

Source data: NVD (nvd.nist.gov), public domain. Exploit-DB.ai adds local AI analysis for defensive use only.

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