{"id":"CVE-2026-90038","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-90038","summary":"NFSD: Prevent client use-after-free during export state revocation","details":"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().","published":"2026-09-16T10:33:37.366Z","modified":"2026-09-17T03:47:20.421310907Z","cvss":{"score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Linux","name":"Kernel","fixedVersion":"7.2.5"}],"fix":null,"references":[{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2108de53568a64936a0da3e04d85c35df98d3fb6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c05ae58fe06ce2ac34312f649e71c3596bdde358"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90038.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90038"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-17T03:47:20.421310907Z"}}