{"id":"CVE-2026-90038","published":"2026-09-16T11:17:17.010","lastModified":"2026-09-16T15:18:26.650","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nNFSD: Prevent client use-after-free during export state revocation\n\nnfsd4_revoke_export_states() has the same use-after-free as\nnfsd4_revoke_states(): it drops nn->client_lock across\nrevoke_one_stid() and the following read of clp->cl_minorversion, but\nthe stateid reference it holds does not pin the client.  A teardown\nracing the dropped lock can free the client while revoke_one_stid()\nstill dereferences it.\n\nexportfs -u drives this path through NFSD_CMD_UNLOCK_EXPORT, so an\nadministrator removing an export can race a client expiry.\n\nSkip a client that is already expiring and otherwise pin it with\ncl_rpc_users under client_lock before dropping the lock, matching\nnfsd4_revoke_states().","cvssScore":9.8,"cvssSeverity":"CRITICAL","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/2108de53568a64936a0da3e04d85c35df98d3fb6","tags":[]},{"url":"https://git.kernel.org/stable/c/c05ae58fe06ce2ac34312f649e71c3596bdde358","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":{"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.","remediation":"Update to the latest Linux kernel version that addresses this vulnerability.","tags":["kernel","use-after-free","security"],"model":"qwen2.5:7b-instruct","analyzedAt":"2026-09-23T08:45:28.087Z"}}