CVE-2026-43340 (GCVE-0-2026-43340)
Vulnerability from cvelistv5 – Published: 2026-05-08 13:37 – Updated: 2026-05-11 22:22
VLAI
EPSS
VEX
Title
comedi: Reinit dev->spinlock between attachments to low-level drivers
Summary
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.
Severity
5.5 (Medium)
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
ed9eccbe8970f6eedc1b978c157caf1251a896d4 , < 3181c34b415c5464be9d34bff3e43ef63b747039
(git)
Affected: ed9eccbe8970f6eedc1b978c157caf1251a896d4 , < 2b1f49e4fdff3ef0f8e9158bbb5b149e06287560 (git) Affected: ed9eccbe8970f6eedc1b978c157caf1251a896d4 , < 4d5ffe524903a30e2e0da7d16841a56bec2de55c (git) Affected: ed9eccbe8970f6eedc1b978c157caf1251a896d4 , < c01bcc67a9a692d65508ebd480405b5e77d562b7 (git) Affected: ed9eccbe8970f6eedc1b978c157caf1251a896d4 , < 430291d8f3884f57ae0057049b0ca291453e29e1 (git) Affected: ed9eccbe8970f6eedc1b978c157caf1251a896d4 , < b89c026227712c367950bbae055a5b31073d3b30 (git) Affected: ed9eccbe8970f6eedc1b978c157caf1251a896d4 , < 83134a7a176ce5b4b19b6edecf4360e8d98d1a5a (git) Affected: ed9eccbe8970f6eedc1b978c157caf1251a896d4 , < 4b9a9a6d71e3e252032f959fb3895a33acb5865c (git) |
guessed | |
| Linux | Linux |
Affected:
2.6.29
Unaffected: 0 , < 2.6.29 (semver) Unaffected: 5.10.253 , ≤ 5.10.* (semver) Unaffected: 5.15.203 , ≤ 5.15.* (semver) Unaffected: 6.1.168 , ≤ 6.1.* (semver) Unaffected: 6.6.134 , ≤ 6.6.* (semver) Unaffected: 6.12.81 , ≤ 6.12.* (semver) Unaffected: 6.18.22 , ≤ 6.18.* (semver) Unaffected: 6.19.12 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix) |
guessed |
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"redhat_vex": {
"aggregate_severity": "None",
"current_release_date": "2026-06-28T07:37:00+00:00",
"cve": "CVE-2026-43340",
"id": "CVE-2026-43340",
"initial_release_date": "2026-05-08T00:00:00+00:00",
"product_status:known_not_affected": "274",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: comedi: Reinit dev-\u003espinlock between attachments to low-level drivers",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43340.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-08-31T17:05:37Z",
"cve": "CVE-2026-43340",
"id": "CVE-2026-43340",
"initial_release_date": "2026-05-13T03:35:09Z",
"product_status:first_fixed": "2",
"product_status:known_affected": "394",
"product_status:known_not_affected": "324",
"product_status:recommended": "250",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-43340",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-43340.json",
"version": "8"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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