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CVE PROGRAM SOURCE RECORD9.8 Critical

CVE-2026-90038

NFSD: Prevent client use-after-free during export state revocation

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Status
Published
Published
Updated
Assigning organization
Linux

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().

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 2eac189bb059d31a29937b29ee0f477394198610 to < c05ae58fe06ce2ac34312f649e71c3596bdde358affected
  • 2eac189bb059d31a29937b29ee0f477394198610 to < 2108de53568a64936a0da3e04d85c35df98d3fb6affected

Linux Linux

Default version status: affected

  • 7.2affected
  • 0 to < 7.2unaffected
  • 7.2.5 to ≤ 7.2.*unaffected
  • 7.3 to ≤ *unaffected

References