{"id":"CVE-2026-89694","title":"nfsd: check client ownership when cancelling a copy-notify stateid","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: check client ownership when cancelling a copy-notify stateid\n\nOn the OFFLOAD_CANCEL path (clp != NULL), manage_cpntf_state() freed the\ntarget cpntf state without …","severity":"high","cvss":7,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"vendor","cwe":["CWE-639"],"vendor":"Linux","product":"Linux","affected":["Linux >= ce0887ac96d35c7105090e166bb0807dc0a0e838 < 88daaed26e17e1c7e851859b5bbb4f0e1ab6d0e9","Linux >= ce0887ac96d35c7105090e166bb0807dc0a0e838 < 81b2cfe767943922eca906a2a5af23a0ce5d0f35","Linux >= ce0887ac96d35c7105090e166bb0807dc0a0e838 < 6bba72b8ee68ad631b94bd439592cba46de54d7d","Linux >= ce0887ac96d35c7105090e166bb0807dc0a0e838 < 75268f6cfe26b09a7e4d3216367e87fe9e2a26aa","Linux >= ce0887ac96d35c7105090e166bb0807dc0a0e838 < b1eca07303594ca27f5dc360a6946bd7e1f5b04c","Linux >= ce0887ac96d35c7105090e166bb0807dc0a0e838 < b42dc26a14b4ad5d6daaada11ec4c70744141c25","Linux >= ce0887ac96d35c7105090e166bb0807dc0a0e838 < d801906165cb5cc250d5cbe44935594e170be3e2","Linux >= ce0887ac96d35c7105090e166bb0807dc0a0e838 < 6bdbfab96e0cf25e5f57dac5c09dc1749751a4bf","Linux 5.6"],"published":"2026-09-11","updated":"2026-10-19","sourceUpdated":"2026-10-19T08:51:07.514Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89694","references":[{"url":"https://git.kernel.org/stable/c/88daaed26e17e1c7e851859b5bbb4f0e1ab6d0e9"},{"url":"https://git.kernel.org/stable/c/81b2cfe767943922eca906a2a5af23a0ce5d0f35"},{"url":"https://git.kernel.org/stable/c/6bba72b8ee68ad631b94bd439592cba46de54d7d"},{"url":"https://git.kernel.org/stable/c/75268f6cfe26b09a7e4d3216367e87fe9e2a26aa"},{"url":"https://git.kernel.org/stable/c/b1eca07303594ca27f5dc360a6946bd7e1f5b04c"},{"url":"https://git.kernel.org/stable/c/b42dc26a14b4ad5d6daaada11ec4c70744141c25"},{"url":"https://git.kernel.org/stable/c/d801906165cb5cc250d5cbe44935594e170be3e2"},{"url":"https://git.kernel.org/stable/c/6bdbfab96e0cf25e5f57dac5c09dc1749751a4bf"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89694.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89694"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532327"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89694"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89694"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89694.mbox"}],"tags":["cve.org","csaf","vex","red-hat"],"epss":0.00216,"epssPercentile":0.12005,"ingestedAt":"2026-09-14T15:23:07.449Z","slug":"CVE-2026-89694","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: check client ownership when cancelling a copy-notify stateid\n\nOn the OFFLOAD_CANCEL path (clp != NULL), manage_cpntf_state() freed the\ntarget cpntf state without checking ownership. The lookup key\nst->si_opaque.so_id is allocated cyclically (guessable) and the embedded\nclientid is the fixed per-net nn->s2s_cp_cl_id, so any authenticated\nNFSv4.2 client could cancel and free another client's copy-notify\nstateid.\n\nCompare the creating clientid recorded in state->cp_p_clid against the\nrequesting client's cl_clientid and return nfserr_bad_stateid on a\nmismatch instead of freeing the entry.\n\n## Affected\n\n- `Linux >= ce0887ac96d35c7105090e166bb0807dc0a0e838 < 88daaed26e17e1c7e851859b5bbb4f0e1ab6d0e9`\n- `Linux >= ce0887ac96d35c7105090e166bb0807dc0a0e838 < 81b2cfe767943922eca906a2a5af23a0ce5d0f35`\n- `Linux >= ce0887ac96d35c7105090e166bb0807dc0a0e838 < 6bba72b8ee68ad631b94bd439592cba46de54d7d`\n- `Linux >= ce0887ac96d35c7105090e166bb0807dc0a0e838 < 75268f6cfe26b09a7e4d3216367e87fe9e2a26aa`\n- `Linux >= ce0887ac96d35c7105090e166bb0807dc0a0e838 < b1eca07303594ca27f5dc360a6946bd7e1f5b04c`\n- `Linux >= ce0887ac96d35c7105090e166bb0807dc0a0e838 < b42dc26a14b4ad5d6daaada11ec4c70744141c25`\n- `Linux >= ce0887ac96d35c7105090e166bb0807dc0a0e838 < d801906165cb5cc250d5cbe44935594e170be3e2`\n- `Linux >= ce0887ac96d35c7105090e166bb0807dc0a0e838 < 6bdbfab96e0cf25e5f57dac5c09dc1749751a4bf`\n- `Linux 5.6`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-09-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89694.json)","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":205449,"id":"CVE-2026-89694","ts":1789576718465,"field":"cvss","old":"5.3","new":"7"},{"seq":205448,"id":"CVE-2026-89694","ts":1789576718465,"field":"severity","old":"medium","new":"high"},{"seq":204011,"id":"CVE-2026-89694","ts":1789490231037,"field":"cvss","old":null,"new":"5.3"},{"seq":204010,"id":"CVE-2026-89694","ts":1789490231037,"field":"severity","old":"none","new":"medium"},{"seq":147369,"id":"CVE-2026-89694","ts":1789270210634,"field":"cvss","old":null,"new":"5.3"},{"seq":147368,"id":"CVE-2026-89694","ts":1789270210634,"field":"severity","old":"none","new":"medium"},{"seq":109124,"id":"CVE-2026-89694","ts":1789183730395,"field":"cvss","old":null,"new":"5.3"},{"seq":109123,"id":"CVE-2026-89694","ts":1789183730395,"field":"severity","old":"none","new":"medium"}]}