{"id":"CVE-2026-89694","state":"PUBLISHED","title":"nfsd: check client ownership when cancelling a copy-notify stateid","description":"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 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.","publishedAt":"2026-09-11T19:46:13.519Z","updatedAt":"2026-10-19T08:51:07.514Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"ce0887ac96d35c7105090e166bb0807dc0a0e838","status":"affected","lessThan":"88daaed26e17e1c7e851859b5bbb4f0e1ab6d0e9","versionType":"git"},{"version":"ce0887ac96d35c7105090e166bb0807dc0a0e838","status":"affected","lessThan":"81b2cfe767943922eca906a2a5af23a0ce5d0f35","versionType":"git"},{"version":"ce0887ac96d35c7105090e166bb0807dc0a0e838","status":"affected","lessThan":"6bba72b8ee68ad631b94bd439592cba46de54d7d","versionType":"git"},{"version":"ce0887ac96d35c7105090e166bb0807dc0a0e838","status":"affected","lessThan":"75268f6cfe26b09a7e4d3216367e87fe9e2a26aa","versionType":"git"},{"version":"ce0887ac96d35c7105090e166bb0807dc0a0e838","status":"affected","lessThan":"b1eca07303594ca27f5dc360a6946bd7e1f5b04c","versionType":"git"},{"version":"ce0887ac96d35c7105090e166bb0807dc0a0e838","status":"affected","lessThan":"b42dc26a14b4ad5d6daaada11ec4c70744141c25","versionType":"git"},{"version":"ce0887ac96d35c7105090e166bb0807dc0a0e838","status":"affected","lessThan":"d801906165cb5cc250d5cbe44935594e170be3e2","versionType":"git"},{"version":"ce0887ac96d35c7105090e166bb0807dc0a0e838","status":"affected","lessThan":"6bdbfab96e0cf25e5f57dac5c09dc1749751a4bf","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/nfsd/nfs4state.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.6","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.6","versionType":"semver"},{"version":"5.10.270","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.221","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.109","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.50","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.4","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/nfsd/nfs4state.c"]}],"references":["https://git.kernel.org/stable/c/88daaed26e17e1c7e851859b5bbb4f0e1ab6d0e9","https://git.kernel.org/stable/c/81b2cfe767943922eca906a2a5af23a0ce5d0f35","https://git.kernel.org/stable/c/6bba72b8ee68ad631b94bd439592cba46de54d7d","https://git.kernel.org/stable/c/75268f6cfe26b09a7e4d3216367e87fe9e2a26aa","https://git.kernel.org/stable/c/b1eca07303594ca27f5dc360a6946bd7e1f5b04c","https://git.kernel.org/stable/c/b42dc26a14b4ad5d6daaada11ec4c70744141c25","https://git.kernel.org/stable/c/d801906165cb5cc250d5cbe44935594e170be3e2","https://git.kernel.org/stable/c/6bdbfab96e0cf25e5f57dac5c09dc1749751a4bf"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:26.108Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/89xxx/CVE-2026-89694.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-89694","state":"PUBLISHED","datePublished":"2026-09-11T19:46:13.519Z","dateUpdated":"2026-10-19T08:51:07.514Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-11T19:38:34.749Z"},"containers":{"cna":{"title":"nfsd: check client ownership when cancelling a copy-notify stateid","descriptions":[{"lang":"en","value":"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 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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"ce0887ac96d35c7105090e166bb0807dc0a0e838","status":"affected","lessThan":"88daaed26e17e1c7e851859b5bbb4f0e1ab6d0e9","versionType":"git"},{"version":"ce0887ac96d35c7105090e166bb0807dc0a0e838","status":"affected","lessThan":"81b2cfe767943922eca906a2a5af23a0ce5d0f35","versionType":"git"},{"version":"ce0887ac96d35c7105090e166bb0807dc0a0e838","status":"affected","lessThan":"6bba72b8ee68ad631b94bd439592cba46de54d7d","versionType":"git"},{"version":"ce0887ac96d35c7105090e166bb0807dc0a0e838","status":"affected","lessThan":"75268f6cfe26b09a7e4d3216367e87fe9e2a26aa","versionType":"git"},{"version":"ce0887ac96d35c7105090e166bb0807dc0a0e838","status":"affected","lessThan":"b1eca07303594ca27f5dc360a6946bd7e1f5b04c","versionType":"git"},{"version":"ce0887ac96d35c7105090e166bb0807dc0a0e838","status":"affected","lessThan":"b42dc26a14b4ad5d6daaada11ec4c70744141c25","versionType":"git"},{"version":"ce0887ac96d35c7105090e166bb0807dc0a0e838","status":"affected","lessThan":"d801906165cb5cc250d5cbe44935594e170be3e2","versionType":"git"},{"version":"ce0887ac96d35c7105090e166bb0807dc0a0e838","status":"affected","lessThan":"6bdbfab96e0cf25e5f57dac5c09dc1749751a4bf","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/nfsd/nfs4state.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.6","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.6","versionType":"semver"},{"version":"5.10.270","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.221","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.109","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.50","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.4","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/nfsd/nfs4state.c"]}],"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"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T08:51:07.514Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"5.10.270"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"5.15.221"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"6.1.188"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"6.6.157"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"6.12.109"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"6.18.50"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"7.2.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}