CVE-2026-43340comedi: Reinit dev->spinlock between attachments to low-level drivers
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: comedi: Reinit dev->spinlock between attachments to low-level drivers `struct comedi_device` is the main controlling structure for a COMEDI device created by the COMEDI subsystem. It contains a member `spinlock` containing a spin-lock that is initialized by the COMEDI subsystem, but is reserved for use by a low-level driver attached to the COMEDI device (at least since commit 25436dc9d84f ("Staging: comedi: remove RT code")). Some COMEDI devices (those created on initialization of the COMEDI subsystem when the "comedi.comedi_num_legacy_minors" parameter is non-zero) can be attached to different low-level drivers over their lifetime using the `COMEDI_DEVCONFIG` ioctl command. This can result in inconsistent lock states being reported when there is a mismatch in the spin-lock locking levels used by each low-level driver to which the COMEDI device has been attached. Fix it by reinitializing `dev->spinlock` before calling the low-level driver's `attach` function pointer if `CONFIG_LOCKDEP` is enabled.
- CVSS
- 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- May 11, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from ed9eccbe8970f6eedc1b978c157caf1251a896d4 before 3181c34b415c5464be9d34bff3e43ef63b747039; from ed9eccbe8970f6eedc1b978c157caf1251a896d4 before 2b1f49e4fdff3ef0f8e9158bbb5b149e06287560; from ed9eccbe8970f6eedc1b978c157caf1251a896d4 before 4d5ffe524903a30e2e0da7d16841a56bec2de55c; from ed9eccbe8970f6eedc1b978c157caf1251a896d4 before c01bcc67a9a692d65508ebd480405b5e77d562b7; from ed9eccbe8970f6eedc1b978c157caf1251a896d4 before 430291d8f3884f57ae0057049b0ca291453e29e1; from ed9eccbe8970f6eedc1b978c157caf1251a896d4 before b89c026227712c367950bbae055a5b31073d3b30; from ed9eccbe8970f6eedc1b978c157caf1251a896d4 before 83134a7a176ce5b4b19b6edecf4360e8d98d1a5a; from ed9eccbe8970f6eedc1b978c157caf1251a896d4 before 4b9a9a6d71e3e252032f959fb3895a33acb5865c | CNA record |
linux linux_kernel linux:linux_kernel | from 2.6.29 before 5.10.253; from 5.11 before 5.15.203; from 5.16 before 6.1.168; from 6.2 before 6.6.134; from 6.7 before 6.12.81; from 6.13 before 6.18.22; from 6.19 before 6.19.12; 7.0; and 6 more ranges | NVD |
References
- https://git.kernel.org/stable/c/3181c34b415c5464be9d34bff3e43ef63b747039patch
- https://git.kernel.org/stable/c/2b1f49e4fdff3ef0f8e9158bbb5b149e06287560patch
- https://git.kernel.org/stable/c/4d5ffe524903a30e2e0da7d16841a56bec2de55cpatch
- https://git.kernel.org/stable/c/c01bcc67a9a692d65508ebd480405b5e77d562b7patch
- https://git.kernel.org/stable/c/430291d8f3884f57ae0057049b0ca291453e29e1patch
- https://git.kernel.org/stable/c/b89c026227712c367950bbae055a5b31073d3b30patch
- https://git.kernel.org/stable/c/83134a7a176ce5b4b19b6edecf4360e8d98d1a5apatch
- https://git.kernel.org/stable/c/4b9a9a6d71e3e252032f959fb3895a33acb5865cpatch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.