{"api_version":"1","generated_at":"2026-09-18T04:52:24+00:00","cve":"CVE-2026-90140","urls":{"html":"https://cve.report/CVE-2026-90140","api":"https://cve.report/api/cve/CVE-2026-90140.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-90140","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-90140"},"summary":{"title":"cuse: wait for pending RCU callbacks on module exit","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ncuse: wait for pending RCU callbacks on module exit\n\nSince commit 053fc4f755ad (\"fuse: fix UAF in rcu pathwalks\"),\nfuse_conn_put() frees the fuse_conn through call_rcu() rather than\nsynchronously. For cuse, fc->release is cuse_fc_release(), which\nlives in the cuse module. If the module is removed before the RCU\ngrace period ends, the callback jumps into freed module memory:\n\n userspace / module unload | RCU softirq\n~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n close(/dev/cuse) |\n cuse_channel_release() |\n fuse_dev_release() |\n fuse_conn_put(fch->conn) |\n call_rcu(delayed_release) ------+---> callback queued\n |\n rmmod cuse |\n cuse_exit() |\n cuse_channel_destroy() |\n ... |\n return |\n |\n |\n | rcu_do_batch()\n | delayed_release()\n | fc->release()\n | -> cuse_fc_release()\n | ^^^ freed text!\n\nThe freed module text is unmapped by vfree(), so the jump into the\nstale callback triggers a page-fault Oops. If the virtual address\nis subsequently reused, the callback could execute unrelated code\n(undefined behaviour).\n\nFix this by calling rcu_barrier() in cuse_exit() so that any pending\nfuse_conn release callback completes before the module is removed.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-17 17:17:06","updated_at":"2026-09-17 17:17:06"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/c40f3f24839f8404325a2099e26c2a04786ae309","name":"https://git.kernel.org/stable/c/c40f3f24839f8404325a2099e26c2a04786ae309","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/4deb3edead0c0e172cc7349e8855d741d3c5e162","name":"https://git.kernel.org/stable/c/4deb3edead0c0e172cc7349e8855d741d3c5e162","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/389bd349ddbcf90dbd8a4f2a4ab6e552d53df134","name":"https://git.kernel.org/stable/c/389bd349ddbcf90dbd8a4f2a4ab6e552d53df134","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7fe415e1cd8fa875be263670c0ab47109818abb6","name":"https://git.kernel.org/stable/c/7fe415e1cd8fa875be263670c0ab47109818abb6","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ac5c499413385cea3e0220d6050408d50842891d","name":"https://git.kernel.org/stable/c/ac5c499413385cea3e0220d6050408d50842891d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a1b46aee33d83f14ed62d7fdef1a91d3e0b732a9","name":"https://git.kernel.org/stable/c/a1b46aee33d83f14ed62d7fdef1a91d3e0b732a9","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/45ae914b2f6ea56fc2f1c017fdee4e995bcb4c0e","name":"https://git.kernel.org/stable/c/45ae914b2f6ea56fc2f1c017fdee4e995bcb4c0e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-90140","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90140","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bfbab62ca69f72bcd14ea30de1fb98f6080ad464 7fe415e1cd8fa875be263670c0ab47109818abb6 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected a8f650b93e55764ca9ff8e1ddebc151f57024086 45ae914b2f6ea56fc2f1c017fdee4e995bcb4c0e git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 535e9bd0e8f8d8cfdc29de7cdb902b5041427fe6 ac5c499413385cea3e0220d6050408d50842891d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 053fc4f755ad43cf35210677bcba798ccdc48d0c a1b46aee33d83f14ed62d7fdef1a91d3e0b732a9 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 053fc4f755ad43cf35210677bcba798ccdc48d0c 389bd349ddbcf90dbd8a4f2a4ab6e552d53df134 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 053fc4f755ad43cf35210677bcba798ccdc48d0c c40f3f24839f8404325a2099e26c2a04786ae309 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 053fc4f755ad43cf35210677bcba798ccdc48d0c 4deb3edead0c0e172cc7349e8855d741d3c5e162 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.15.166 5.15.221 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.1.107 6.1.188 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.6.48 6.6.157 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.8","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.8 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.221 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.188 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.157 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.110 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.52 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.6 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["fs/fuse/cuse.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"7fe415e1cd8fa875be263670c0ab47109818abb6","status":"affected","version":"bfbab62ca69f72bcd14ea30de1fb98f6080ad464","versionType":"git"},{"lessThan":"45ae914b2f6ea56fc2f1c017fdee4e995bcb4c0e","status":"affected","version":"a8f650b93e55764ca9ff8e1ddebc151f57024086","versionType":"git"},{"lessThan":"ac5c499413385cea3e0220d6050408d50842891d","status":"affected","version":"535e9bd0e8f8d8cfdc29de7cdb902b5041427fe6","versionType":"git"},{"lessThan":"a1b46aee33d83f14ed62d7fdef1a91d3e0b732a9","status":"affected","version":"053fc4f755ad43cf35210677bcba798ccdc48d0c","versionType":"git"},{"lessThan":"389bd349ddbcf90dbd8a4f2a4ab6e552d53df134","status":"affected","version":"053fc4f755ad43cf35210677bcba798ccdc48d0c","versionType":"git"},{"lessThan":"c40f3f24839f8404325a2099e26c2a04786ae309","status":"affected","version":"053fc4f755ad43cf35210677bcba798ccdc48d0c","versionType":"git"},{"lessThan":"4deb3edead0c0e172cc7349e8855d741d3c5e162","status":"affected","version":"053fc4f755ad43cf35210677bcba798ccdc48d0c","versionType":"git"},{"lessThan":"5.15.221","status":"affected","version":"5.15.166","versionType":"semver"},{"lessThan":"6.1.188","status":"affected","version":"6.1.107","versionType":"semver"},{"lessThan":"6.6.157","status":"affected","version":"6.6.48","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["fs/fuse/cuse.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.8"},{"lessThan":"6.8","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.221","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.188","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.157","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.110","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.52","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.6","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.221","versionStartIncluding":"5.15.166","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.188","versionStartIncluding":"6.1.107","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.157","versionStartIncluding":"6.6.48","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.110","versionStartIncluding":"6.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.52","versionStartIncluding":"6.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.6","versionStartIncluding":"6.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc1","versionStartIncluding":"6.8","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ncuse: wait for pending RCU callbacks on module exit\n\nSince commit 053fc4f755ad (\"fuse: fix UAF in rcu pathwalks\"),\nfuse_conn_put() frees the fuse_conn through call_rcu() rather than\nsynchronously. For cuse, fc->release is cuse_fc_release(), which\nlives in the cuse module. If the module is removed before the RCU\ngrace period ends, the callback jumps into freed module memory:\n\n userspace / module unload | RCU softirq\n~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n close(/dev/cuse) |\n cuse_channel_release() |\n fuse_dev_release() |\n fuse_conn_put(fch->conn) |\n call_rcu(delayed_release) ------+---> callback queued\n |\n rmmod cuse |\n cuse_exit() |\n cuse_channel_destroy() |\n ... |\n return |\n |\n |\n | rcu_do_batch()\n | delayed_release()\n | fc->release()\n | -> cuse_fc_release()\n | ^^^ freed text!\n\nThe freed module text is unmapped by vfree(), so the jump into the\nstale callback triggers a page-fault Oops. If the virtual address\nis subsequently reused, the callback could execute unrelated code\n(undefined behaviour).\n\nFix this by calling rcu_barrier() in cuse_exit() so that any pending\nfuse_conn release callback completes before the module is removed."}],"providerMetadata":{"dateUpdated":"2026-09-17T16:06:37.824Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/7fe415e1cd8fa875be263670c0ab47109818abb6"},{"url":"https://git.kernel.org/stable/c/45ae914b2f6ea56fc2f1c017fdee4e995bcb4c0e"},{"url":"https://git.kernel.org/stable/c/ac5c499413385cea3e0220d6050408d50842891d"},{"url":"https://git.kernel.org/stable/c/a1b46aee33d83f14ed62d7fdef1a91d3e0b732a9"},{"url":"https://git.kernel.org/stable/c/389bd349ddbcf90dbd8a4f2a4ab6e552d53df134"},{"url":"https://git.kernel.org/stable/c/c40f3f24839f8404325a2099e26c2a04786ae309"},{"url":"https://git.kernel.org/stable/c/4deb3edead0c0e172cc7349e8855d741d3c5e162"}],"title":"cuse: wait for pending RCU callbacks on module exit","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-90140","datePublished":"2026-09-17T16:06:37.824Z","dateReserved":"2026-09-11T19:38:34.789Z","dateUpdated":"2026-09-17T16:06:37.824Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-17 17:17:06","lastModifiedDate":"2026-09-17 17:17:06","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"90140","Ordinal":"1","Title":"cuse: wait for pending RCU callbacks on module exit","CVE":"CVE-2026-90140","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"90140","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\ncuse: wait for pending RCU callbacks on module exit\n\nSince commit 053fc4f755ad (\"fuse: fix UAF in rcu pathwalks\"),\nfuse_conn_put() frees the fuse_conn through call_rcu() rather than\nsynchronously. For cuse, fc->release is cuse_fc_release(), which\nlives in the cuse module. If the module is removed before the RCU\ngrace period ends, the callback jumps into freed module memory:\n\n userspace / module unload | RCU softirq\n~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n close(/dev/cuse) |\n cuse_channel_release() |\n fuse_dev_release() |\n fuse_conn_put(fch->conn) |\n call_rcu(delayed_release) ------+---> callback queued\n |\n rmmod cuse |\n cuse_exit() |\n cuse_channel_destroy() |\n ... |\n return |\n |\n |\n | rcu_do_batch()\n | delayed_release()\n | fc->release()\n | -> cuse_fc_release()\n | ^^^ freed text!\n\nThe freed module text is unmapped by vfree(), so the jump into the\nstale callback triggers a page-fault Oops. If the virtual address\nis subsequently reused, the callback could execute unrelated code\n(undefined behaviour).\n\nFix this by calling rcu_barrier() in cuse_exit() so that any pending\nfuse_conn release callback completes before the module is removed.","Type":"Description","Title":"cuse: wait for pending RCU callbacks on module exit"}]}}}