CVE-2026-43340
Vulnerability Scoring
Analysis In Progress
CVE-2026-43340 Vulnerability Analysis & Exploit Details
CVE-2026-43340
Attack Complexity Details
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Attack Complexity:
Attack Complexity Analysis In Progress
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Attack Vector:
Attack Vector Under Analysis
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Privileges Required:
None
No authentication is required for exploitation.
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Scope:
Impact is confined to the initially vulnerable component.
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User Interaction:
None
No user interaction is necessary for exploitation.
CVE-2026-43340 Details
Status: Received on 08 May 2026, 14:16 UTC
Published on: 08 May 2026, 14:16 UTC
CVSS Release:
CVE-2026-43340 Vulnerability Summary
CVE-2026-43340: 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.
Assessing the Risk of CVE-2026-43340
Access Complexity Graph
The exploitability of CVE-2026-43340 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).
Exploitability Analysis for CVE-2026-43340
No exploitability data is available for CVE-2026-43340.
Understanding AC and PR
A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.
Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.
Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.
CVSS Score Breakdown Chart
Above is the CVSS Sub-score Breakdown for CVE-2026-43340, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.
CIA Impact Analysis
Below is the Impact Analysis for CVE-2026-43340, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.
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Confidentiality:
None
CVE-2026-43340 does not compromise confidentiality.
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Integrity:
None
CVE-2026-43340 does not impact data integrity.
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Availability:
None
CVE-2026-43340 does not affect system availability.
CVE-2026-43340 References
External References
- https://git.kernel.org/stable/c/2b1f49e4fdff3ef0f8e9158bbb5b149e06287560
- https://git.kernel.org/stable/c/3181c34b415c5464be9d34bff3e43ef63b747039
- https://git.kernel.org/stable/c/430291d8f3884f57ae0057049b0ca291453e29e1
- https://git.kernel.org/stable/c/4b9a9a6d71e3e252032f959fb3895a33acb5865c
- https://git.kernel.org/stable/c/4d5ffe524903a30e2e0da7d16841a56bec2de55c
- https://git.kernel.org/stable/c/83134a7a176ce5b4b19b6edecf4360e8d98d1a5a
- https://git.kernel.org/stable/c/b89c026227712c367950bbae055a5b31073d3b30
- https://git.kernel.org/stable/c/c01bcc67a9a692d65508ebd480405b5e77d562b7
CWE Common Weakness Enumeration
Unknown
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