CVE-2026-43340

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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->spinlock` before calling the low-level driver's `attach` function\npointer if `CONFIG_LOCKDEP` is enabled."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/comedi/drivers.c"], "versions": [{"version": "ed9eccbe8970f6eedc1b978c157caf1251a896d4", "lessThan": "3181c34b415c5464be9d34bff3e43ef63b747039", "status": "affected", "versionType": "git"}, {"version": "ed9eccbe8970f6eedc1b978c157caf1251a896d4", "lessThan": "2b1f49e4fdff3ef0f8e9158bbb5b149e06287560", "status": "affected", "versionType": "git"}, {"version": "ed9eccbe8970f6eedc1b978c157caf1251a896d4", "lessThan": "4d5ffe524903a30e2e0da7d16841a56bec2de55c", "status": "affected", "versionType": "git"}, {"version": "ed9eccbe8970f6eedc1b978c157caf1251a896d4", "lessThan": "c01bcc67a9a692d65508ebd480405b5e77d562b7", "status": "affected", "versionType": "git"}, {"version": "ed9eccbe8970f6eedc1b978c157caf1251a896d4", "lessThan": "430291d8f3884f57ae0057049b0ca291453e29e1", "status": "affected", "versionType": "git"}, {"version": "ed9eccbe8970f6eedc1b978c157caf1251a896d4", "lessThan": "b89c026227712c367950bbae055a5b31073d3b30", "status": "affected", "versionType": "git"}, {"version": "ed9eccbe8970f6eedc1b978c157caf1251a896d4", "lessThan": "83134a7a176ce5b4b19b6edecf4360e8d98d1a5a", "status": "affected", "versionType": "git"}, {"version": "ed9eccbe8970f6eedc1b978c157caf1251a896d4", "lessThan": "4b9a9a6d71e3e252032f959fb3895a33acb5865c", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/comedi/drivers.c"], "versions": [{"version": "2.6.29", "status": "affected"}, {"version": "0", "lessThan": "2.6.29", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.253", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.203", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.168", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.134", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.81", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.22", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.12", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.29", "versionEndExcluding": "5.10.253"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.29", "versionEndExcluding": "5.15.203"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.29", "versionEndExcluding": "6.1.168"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.29", "versionEndExcluding": "6.6.134"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.29", "versionEndExcluding": "6.12.81"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.29", "versionEndExcluding": "6.18.22"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.29", "versionEndExcluding": "6.19.12"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.29", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/3181c34b415c5464be9d34bff3e43ef63b747039"}, {"url": "https://git.kernel.org/stable/c/2b1f49e4fdff3ef0f8e9158bbb5b149e06287560"}, {"url": "https://git.kernel.org/stable/c/4d5ffe524903a30e2e0da7d16841a56bec2de55c"}, {"url": "https://git.kernel.org/stable/c/c01bcc67a9a692d65508ebd480405b5e77d562b7"}, {"url": "https://git.kernel.org/stable/c/430291d8f3884f57ae0057049b0ca291453e29e1"}, {"url": "https://git.kernel.org/stable/c/b89c026227712c367950bbae055a5b31073d3b30"}, {"url": "https://git.kernel.org/stable/c/83134a7a176ce5b4b19b6edecf4360e8d98d1a5a"}, {"url": "https://git.kernel.org/stable/c/4b9a9a6d71e3e252032f959fb3895a33acb5865c"}], "title": "comedi: Reinit dev->spinlock between attachments to low-level drivers", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

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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->spinlock` before calling the low-level driver's `attach` function\npointer if `CONFIG_LOCKDEP` is enabled."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ncomedi: Reinicializar \u2019dev -> spinlock\u2019 entre adjuntos a controladores de bajo nivel\n\n\u2019struct comedi_device\u2019 es la estructura de control principal para un dispositivo COMEDI creado por el subsistema COMEDI. Contiene un miembro \u2019spinlock\u2019 que contiene un spin-lock que es inicializado por el subsistema COMEDI, pero est\u00e1 reservado para uso por un controlador de bajo nivel adjunto al dispositivo COMEDI (al menos desde el commit 25436dc9d84f (\u2019Staging: comedi: remove RT code\u2019)).\n\nAlgunos dispositivos COMEDI (aquellos creados en la inicializaci\u00f3n del subsistema COMEDI cuando el par\u00e1metro \u2019comedi.comedi_num_legacy_minors\u2019 no es cero) pueden ser adjuntados a diferentes controladores de bajo nivel durante su vida \u00fatil usando el comando ioctl \u2019COMEDI_DEVCONFIG\u2019. Esto puede resultar en que se reporten estados de bloqueo inconsistentes cuando hay un desajuste en los niveles de bloqueo del spin-lock utilizados por cada controlador de bajo nivel al que se ha adjuntado el dispositivo COMEDI. Solucionarlo reinicializando \u2019dev -> spinlock\u2019 antes de llamar al puntero de funci\u00f3n \u2019attach\u2019 del controlador de bajo nivel si \u2019CONFIG_LOCKDEP\u2019 est\u00e1 habilitado."}], "id": "CVE-2026-43340", "lastModified": "2026-11-11T20:10:00.273", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2026-05-08T14:16:43.910", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2b1f49e4fdff3ef0f8e9158bbb5b149e06287560"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3181c34b415c5464be9d34bff3e43ef63b747039"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/430291d8f3884f57ae0057049b0ca291453e29e1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4b9a9a6d71e3e252032f959fb3895a33acb5865c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4d5ffe524903a30e2e0da7d16841a56bec2de55c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/83134a7a176ce5b4b19b6edecf4360e8d98d1a5a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b89c026227712c367950bbae055a5b31073d3b30"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c01bcc67a9a692d65508ebd480405b5e77d562b7"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: comedi: Reinit dev->spinlock between attachments to low-level drivers", "id": "2468098", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2468098"}, "csaw": false, "cwe": "CWE-909", "details": ["A flaw was found in the `comedi` subsystem of the Linux kernel. This vulnerability arises when a `comedi_device` is reattached to different low-level drivers using the `COMEDI_DEVCONFIG` ioctl command. A local user with appropriate privileges could exploit this by repeatedly attaching the device, leading to inconsistent spin-lock states. This inconsistency may cause system instability or unexpected behavior within the kernel."], "name": "CVE-2026-43340", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-08T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-43340\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43340\nhttps://lore.kernel.org/linux-cve-announce/2026050822-CVE-2026-43340-6939@gregkh/T"]}

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