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CVE-2026-90038: Linux

Severity

9.8 (CRITICAL)

Vendor

LINUX

Affected versions

2eac189bb059d31a29937b29ee0f477394198610 through before c05ae58fe06ce2ac34312f649e71c3596bdde358; 2eac189bb059d31a29937b

Patch status

Patched

Published

2026-09-16T11:17:17.010

Modified

2026-09-16T15:18:26.650

Why it matters

Critical vulnerability requiring immediate validation against your environment.

Recommended admin actions

• Prioritize validation immediately due to critical CVSS severity.
• Compare installed versions against the affected version range in the advisory.

Technical summary

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().

View the official NVD record for CVE-2026-90038

CVE data is sourced from NVD/CNA records and optional enrichment. Validate against the vendor advisory before taking production action.