{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "bfbab62ca69f72bcd14ea30de1fb98f6080ad464"
            },
            {
              "fixed": "7fe415e1cd8fa875be263670c0ab47109818abb6"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "a8f650b93e55764ca9ff8e1ddebc151f57024086"
            },
            {
              "fixed": "45ae914b2f6ea56fc2f1c017fdee4e995bcb4c0e"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "535e9bd0e8f8d8cfdc29de7cdb902b5041427fe6"
            },
            {
              "fixed": "ac5c499413385cea3e0220d6050408d50842891d"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
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            {
              "introduced": "053fc4f755ad43cf35210677bcba798ccdc48d0c"
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            },
            {
              "fixed": "389bd349ddbcf90dbd8a4f2a4ab6e552d53df134"
            },
            {
              "fixed": "c40f3f24839f8404325a2099e26c2a04786ae309"
            },
            {
              "fixed": "4deb3edead0c0e172cc7349e8855d741d3c5e162"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "5.15.166"
            },
            {
              "fixed": "5.15.221"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "6.1.107"
            },
            {
              "fixed": "6.1.188"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "6.6.48"
            },
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            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.15.221"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
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              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.188"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.157"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.110"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.8.0"
            },
            {
              "fixed": "6.18.52"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "7.2.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90140.json"
  },
  "details": "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-\u003erelease 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-\u003econn)         |\n     call_rcu(delayed_release) ------+---\u003e callback queued\n                                     |\n rmmod cuse                          |\n  cuse_exit()                        |\n   cuse_channel_destroy()            |\n   ...                               |\n   return                            |\n                                     |\n \u003cmodule text freed\u003e                 |\n                                     |  rcu_do_batch()\n                                     |   delayed_release()\n                                     |    fc-\u003erelease()\n                                     |     -\u003e 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.",
  "id": "CVE-2026-90140",
  "modified": "2026-09-19T03:30:49.355546573Z",
  "published": "2026-09-17T16:06:37.824Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/389bd349ddbcf90dbd8a4f2a4ab6e552d53df134"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/45ae914b2f6ea56fc2f1c017fdee4e995bcb4c0e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4deb3edead0c0e172cc7349e8855d741d3c5e162"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7fe415e1cd8fa875be263670c0ab47109818abb6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a1b46aee33d83f14ed62d7fdef1a91d3e0b732a9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ac5c499413385cea3e0220d6050408d50842891d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c40f3f24839f8404325a2099e26c2a04786ae309"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90140.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90140"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "cuse: wait for pending RCU callbacks on module exit"
}