{"id":"CVE-2026-31749","summary":"comedi: ni_atmio16d: Fix invalid clean-up after failed attach","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ncomedi: ni_atmio16d: Fix invalid clean-up after failed attach\n\nIf the driver's COMEDI \"attach\" handler function (`atmio16d_attach()`)\nreturns an error, the COMEDI core will call the driver's \"detach\"\nhandler function (`atmio16d_detach()`) to clean up.  This calls\n`reset_atmio16d()` unconditionally, but depending on where the error\noccurred in the attach handler, the device may not have been\nsufficiently initialized to call `reset_atmio16d()`.  It uses\n`dev-\u003eiobase` as the I/O port base address and `dev-\u003eprivate` as the\npointer to the COMEDI device's private data structure.  `dev-\u003eiobase`\nmay still be set to its initial value of 0, which would result in\nundesired writes to low I/O port addresses.  `dev-\u003eprivate` may still be\n`NULL`, which would result in null pointer dereferences.\n\nFix `atmio16d_detach()` by checking that `dev-\u003eprivate` is valid\n(non-null) before calling `reset_atmio16d()`.  This implies that\n`dev-\u003eiobase` was set correctly since that is set up before\n`dev-\u003eprivate`.","modified":"2026-07-08T07:01:41.149403215Z","published":"2026-05-01T14:14:42.227Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31749.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/101ab946b79ad83b36d5cfd47de587492a80acf0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3848ae00b1642e2c98ff8cbfd2d3b38c6f53b5c3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/43c68a2c7cc35b7c2a83c285cb4ad3d472b8caa2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5d8d88c8c0eec230de8f1f60e0920a4337939a88"},{"type":"WEB","url":"https://git.kernel.org/stable/c/933a2d6a95f9bfb203e562c9be1dd990c735535c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a01dd339ea6ac58b0967a50085622a6017351140"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d07d97ca4f7fac467cdcf4a012690853958b7e89"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f517646e008fe99ca1800601cd011b110f8684ae"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31749.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-31749"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"2323b276308a5da5774b778f39c7fd94b2a3022a"},{"fixed":"a01dd339ea6ac58b0967a50085622a6017351140"},{"fixed":"933a2d6a95f9bfb203e562c9be1dd990c735535c"},{"fixed":"5d8d88c8c0eec230de8f1f60e0920a4337939a88"},{"fixed":"f517646e008fe99ca1800601cd011b110f8684ae"},{"fixed":"3848ae00b1642e2c98ff8cbfd2d3b38c6f53b5c3"},{"fixed":"43c68a2c7cc35b7c2a83c285cb4ad3d472b8caa2"},{"fixed":"d07d97ca4f7fac467cdcf4a012690853958b7e89"},{"fixed":"101ab946b79ad83b36d5cfd47de587492a80acf0"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-31749.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.30"},{"fixed":"5.10.253"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.203"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.168"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.134"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.81"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.22"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"6.19.12"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-31749.json"}}],"schema_version":"1.7.5"}