{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-90140", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.789Z", "datePublished": "2026-09-17T16:06:37.824Z", "dateUpdated": "2026-10-19T08:58:38.281Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:58:38.281Z" }, "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." } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/fuse/cuse.c" ], "versions": [ { "version": "bfbab62ca69f72bcd14ea30de1fb98f6080ad464", "lessThan": "7fe415e1cd8fa875be263670c0ab47109818abb6", "status": "affected", "versionType": "git" }, { "version": "a8f650b93e55764ca9ff8e1ddebc151f57024086", "lessThan": "45ae914b2f6ea56fc2f1c017fdee4e995bcb4c0e", "status": "affected", "versionType": "git" }, { "version": "535e9bd0e8f8d8cfdc29de7cdb902b5041427fe6", "lessThan": "ac5c499413385cea3e0220d6050408d50842891d", "status": "affected", "versionType": "git" }, { "version": "053fc4f755ad43cf35210677bcba798ccdc48d0c", "lessThan": "a1b46aee33d83f14ed62d7fdef1a91d3e0b732a9", "status": "affected", "versionType": "git" }, { "version": "053fc4f755ad43cf35210677bcba798ccdc48d0c", "lessThan": "389bd349ddbcf90dbd8a4f2a4ab6e552d53df134", "status": "affected", "versionType": "git" }, { "version": "053fc4f755ad43cf35210677bcba798ccdc48d0c", "lessThan": "c40f3f24839f8404325a2099e26c2a04786ae309", "status": "affected", "versionType": "git" }, { "version": "053fc4f755ad43cf35210677bcba798ccdc48d0c", "lessThan": "4deb3edead0c0e172cc7349e8855d741d3c5e162", "status": "affected", "versionType": "git" }, { "version": "5.15.166", "lessThan": "5.15.221", "status": "affected", "versionType": "semver" }, { "version": "6.1.107", "lessThan": "6.1.188", "status": "affected", "versionType": "semver" }, { "version": "6.6.48", "lessThan": "6.6.157", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/fuse/cuse.c" ], "versions": [ { "version": "6.8", "status": "affected" }, { "version": "0", "lessThan": "6.8", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.221", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.110", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.52", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.6", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15.166", "versionEndExcluding": "5.15.221" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.107", "versionEndExcluding": "6.1.188" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.48", "versionEndExcluding": "6.6.157" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "6.12.110" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "6.18.52" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "7.2.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "7.3" } ] } ] } ], "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" } } } }