CVE-2026-43340

MEDIUM EPSS 1.8%
Published May 8, 20261mo ago · Modified Jun 17, 20262w ago
5.5 CVSS 3.1
Medium
Find Similar
Published May 8, 2026 1mo ago
Last Modified Jun 17, 2026 2w ago

Description

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 Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
1.8% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Affected Products 14

VendorProductVersionRange
linuxlinux_kernel*≥2.6.29  –  <5.10.253
linuxlinux_kernel*≥5.11  –  <5.15.203
linuxlinux_kernel*≥5.16  –  <6.1.168
linuxlinux_kernel*≥6.2  –  <6.6.134
linuxlinux_kernel*≥6.7  –  <6.12.81
linuxlinux_kernel*≥6.13  –  <6.18.22
linuxlinux_kernel*≥6.19  –  <6.19.12
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any

References 8

  • git.kernel.org https://git.kernel.org/stable/c/2b1f49e4fdff3ef0f8e9158bbb5b149e06287560
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/3181c34b415c5464be9d34bff3e43ef63b747039
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/430291d8f3884f57ae0057049b0ca291453e29e1
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/4b9a9a6d71e3e252032f959fb3895a33acb5865c
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/4d5ffe524903a30e2e0da7d16841a56bec2de55c
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/83134a7a176ce5b4b19b6edecf4360e8d98d1a5a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b89c026227712c367950bbae055a5b31073d3b30
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c01bcc67a9a692d65508ebd480405b5e77d562b7
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/2b1f49e4fdff3ef0f8e9158bbb5b149e06287560
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/3181c34b415c5464be9d34bff3e43ef63b747039
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/430291d8f3884f57ae0057049b0ca291453e29e1
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/4b9a9a6d71e3e252032f959fb3895a33acb5865c
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/4d5ffe524903a30e2e0da7d16841a56bec2de55c
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/83134a7a176ce5b4b19b6edecf4360e8d98d1a5a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b89c026227712c367950bbae055a5b31073d3b30
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c01bcc67a9a692d65508ebd480405b5e77d562b7
    Patch