{"id":"CVE-2026-43340","summary":"comedi: Reinit dev-\u003espinlock between attachments to low-level drivers","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ncomedi: Reinit dev-\u003espinlock between attachments to low-level drivers\n\n`struct comedi_device` is the main controlling structure for a COMEDI\ndevice created by the COMEDI subsystem.  It contains a member `spinlock`\ncontaining a spin-lock that is initialized by the COMEDI subsystem, but\nis reserved for use by a low-level driver attached to the COMEDI device\n(at least since commit 25436dc9d84f (\"Staging: comedi: remove RT\ncode\")).\n\nSome COMEDI devices (those created on initialization of the COMEDI\nsubsystem when the \"comedi.comedi_num_legacy_minors\" parameter is\nnon-zero) can be attached to different low-level drivers over their\nlifetime using the `COMEDI_DEVCONFIG` ioctl command.  This can result in\ninconsistent lock states being reported when there is a mismatch in the\nspin-lock locking levels used by each low-level driver to which the\nCOMEDI device has been attached.  Fix it by reinitializing\n`dev-\u003espinlock` before calling the low-level driver's `attach` function\npointer if `CONFIG_LOCKDEP` is enabled.","modified":"2026-07-15T01:49:20.907200793Z","published":"2026-05-08T13:37:18.580Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43340.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/2b1f49e4fdff3ef0f8e9158bbb5b149e06287560"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3181c34b415c5464be9d34bff3e43ef63b747039"},{"type":"WEB","url":"https://git.kernel.org/stable/c/430291d8f3884f57ae0057049b0ca291453e29e1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4b9a9a6d71e3e252032f959fb3895a33acb5865c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4d5ffe524903a30e2e0da7d16841a56bec2de55c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/83134a7a176ce5b4b19b6edecf4360e8d98d1a5a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b89c026227712c367950bbae055a5b31073d3b30"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c01bcc67a9a692d65508ebd480405b5e77d562b7"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43340.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43340"},{"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":"ed9eccbe8970f6eedc1b978c157caf1251a896d4"},{"fixed":"3181c34b415c5464be9d34bff3e43ef63b747039"},{"fixed":"2b1f49e4fdff3ef0f8e9158bbb5b149e06287560"},{"fixed":"4d5ffe524903a30e2e0da7d16841a56bec2de55c"},{"fixed":"c01bcc67a9a692d65508ebd480405b5e77d562b7"},{"fixed":"430291d8f3884f57ae0057049b0ca291453e29e1"},{"fixed":"b89c026227712c367950bbae055a5b31073d3b30"},{"fixed":"83134a7a176ce5b4b19b6edecf4360e8d98d1a5a"},{"fixed":"4b9a9a6d71e3e252032f959fb3895a33acb5865c"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-43340.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.29"},{"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-2026-43340.json"}}],"schema_version":"1.7.5"}