CVE-2026-31749

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This calls\n`reset_atmio16d()` unconditionally, but depending on where the error\noccurred in the attach handler, the device may not have been\nsufficiently initialized to call `reset_atmio16d()`. It uses\n`dev->iobase` as the I/O port base address and `dev->private` as the\npointer to the COMEDI device's private data structure. `dev->iobase`\nmay still be set to its initial value of 0, which would result in\nundesired writes to low I/O port addresses. `dev->private` may still be\n`NULL`, which would result in null pointer dereferences.\n\nFix `atmio16d_detach()` by checking that `dev->private` is valid\n(non-null) before calling `reset_atmio16d()`. This implies that\n`dev->iobase` was set correctly since that is set up before\n`dev->private`."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/comedi/drivers/ni_atmio16d.c"], "versions": [{"version": "2323b276308a5da5774b778f39c7fd94b2a3022a", "lessThan": "a01dd339ea6ac58b0967a50085622a6017351140", "status": "affected", "versionType": "git"}, {"version": "2323b276308a5da5774b778f39c7fd94b2a3022a", "lessThan": "933a2d6a95f9bfb203e562c9be1dd990c735535c", "status": "affected", "versionType": "git"}, {"version": "2323b276308a5da5774b778f39c7fd94b2a3022a", "lessThan": "5d8d88c8c0eec230de8f1f60e0920a4337939a88", "status": "affected", "versionType": "git"}, {"version": "2323b276308a5da5774b778f39c7fd94b2a3022a", "lessThan": "f517646e008fe99ca1800601cd011b110f8684ae", "status": "affected", "versionType": "git"}, {"version": "2323b276308a5da5774b778f39c7fd94b2a3022a", "lessThan": "3848ae00b1642e2c98ff8cbfd2d3b38c6f53b5c3", "status": "affected", "versionType": "git"}, {"version": "2323b276308a5da5774b778f39c7fd94b2a3022a", "lessThan": "43c68a2c7cc35b7c2a83c285cb4ad3d472b8caa2", "status": "affected", "versionType": "git"}, {"version": "2323b276308a5da5774b778f39c7fd94b2a3022a", "lessThan": "d07d97ca4f7fac467cdcf4a012690853958b7e89", "status": "affected", "versionType": "git"}, {"version": "2323b276308a5da5774b778f39c7fd94b2a3022a", "lessThan": "101ab946b79ad83b36d5cfd47de587492a80acf0", "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/ni_atmio16d.c"], "versions": [{"version": "2.6.30", "status": "affected"}, {"version": "0", "lessThan": "2.6.30", "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": "2.6.30", "versionEndExcluding": "5.10.253"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "5.15.203"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "6.1.168"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "6.6.134"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "6.12.81"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "6.18.22"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "6.19.12"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/a01dd339ea6ac58b0967a50085622a6017351140"}, {"url": "https://git.kernel.org/stable/c/933a2d6a95f9bfb203e562c9be1dd990c735535c"}, {"url": "https://git.kernel.org/stable/c/5d8d88c8c0eec230de8f1f60e0920a4337939a88"}, {"url": "https://git.kernel.org/stable/c/f517646e008fe99ca1800601cd011b110f8684ae"}, {"url": "https://git.kernel.org/stable/c/3848ae00b1642e2c98ff8cbfd2d3b38c6f53b5c3"}, {"url": "https://git.kernel.org/stable/c/43c68a2c7cc35b7c2a83c285cb4ad3d472b8caa2"}, {"url": "https://git.kernel.org/stable/c/d07d97ca4f7fac467cdcf4a012690853958b7e89"}, {"url": "https://git.kernel.org/stable/c/101ab946b79ad83b36d5cfd47de587492a80acf0"}], "title": "comedi: ni_atmio16d: Fix invalid clean-up after failed attach", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

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This calls\n`reset_atmio16d()` unconditionally, but depending on where the error\noccurred in the attach handler, the device may not have been\nsufficiently initialized to call `reset_atmio16d()`. It uses\n`dev->iobase` as the I/O port base address and `dev->private` as the\npointer to the COMEDI device's private data structure. `dev->iobase`\nmay still be set to its initial value of 0, which would result in\nundesired writes to low I/O port addresses. `dev->private` may still be\n`NULL`, which would result in null pointer dereferences.\n\nFix `atmio16d_detach()` by checking that `dev->private` is valid\n(non-null) before calling `reset_atmio16d()`. This implies that\n`dev->iobase` was set correctly since that is set up before\n`dev->private`."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ncomedi: ni_atmio16d: Correcci\u00f3n de limpieza inv\u00e1lida despu\u00e9s de un \u2019attach\u2019 fallido\n\nSi la funci\u00f3n gestora \u2019attach\u2019 de COMEDI del controlador (\u2019atmio16d_attach()\u2019) devuelve un error, el n\u00facleo de COMEDI llamar\u00e1 a la funci\u00f3n gestora \u2019detach\u2019 del controlador (\u2019atmio16d_detach()\u2019) para realizar la limpieza. Esto llama a \u2019reset_atmio16d()\u2019 incondicionalmente, pero dependiendo de d\u00f3nde ocurri\u00f3 el error en el gestor de \u2019attach\u2019, el dispositivo podr\u00eda no haber sido inicializado suficientemente para llamar a \u2019reset_atmio16d()\u2019. Utiliza \u2019dev -> iobase\u2019 como la direcci\u00f3n base del puerto de E/S y \u2019dev -> private\u2019 como el puntero a la estructura de datos privada del dispositivo COMEDI. \u2019dev -> iobase\u2019 podr\u00eda seguir establecido a su valor inicial de 0, lo que resultar\u00eda en escrituras no deseadas a direcciones de puerto de E/S bajas. \u2019dev -> private\u2019 podr\u00eda seguir siendo \u2019NULL\u2019, lo que resultar\u00eda en desreferencias de puntero nulo.\n\nCorrige \u2019atmio16d_detach()\u2019 comprobando que \u2019dev -> private\u2019 es v\u00e1lido (no nulo) antes de llamar a \u2019reset_atmio16d()\u2019. Esto implica que \u2019dev -> iobase\u2019 se configur\u00f3 correctamente ya que eso se configura antes que \u2019dev -> private\u2019."}], "id": "CVE-2026-31749", "lastModified": "2026-11-11T21:10:00.200", "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": "2026-05-01T15:16:37.723", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/101ab946b79ad83b36d5cfd47de587492a80acf0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3848ae00b1642e2c98ff8cbfd2d3b38c6f53b5c3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/43c68a2c7cc35b7c2a83c285cb4ad3d472b8caa2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5d8d88c8c0eec230de8f1f60e0920a4337939a88"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/933a2d6a95f9bfb203e562c9be1dd990c735535c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a01dd339ea6ac58b0967a50085622a6017351140"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d07d97ca4f7fac467cdcf4a012690853958b7e89"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f517646e008fe99ca1800601cd011b110f8684ae"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: comedi: ni_atmio16d: Fix invalid clean-up after failed attach", "id": "2464435", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2464435"}, "csaw": false, "cwe": "CWE-824", "details": ["A flaw was found in the `ni_atmio16d` driver within the Comedi (Comedi is a collection of drivers for data acquisition equipment) subsystem of the Linux kernel. This vulnerability occurs when an error during the driver's attach process causes the cleanup function (`atmio16d_detach()`) to be called with uninitialized device data. This can lead to undesired writes to low I/O port addresses or null pointer dereferences, potentially resulting in system instability or a denial of service (DoS) for a local user."], "name": "CVE-2026-31749", "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": "2026-05-01T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31749\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31749\nhttps://lore.kernel.org/linux-cve-announce/2026050142-CVE-2026-31749-e7d2@gregkh/T"]}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2323b276308a5da5774b778f39c7fd94b2a3022a,a01dd339ea6ac58b0967a50085622a6017351140)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2323b276308a5da5774b778f39c7fd94b2a3022a,933a2d6a95f9bfb203e562c9be1dd990c735535c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2323b276308a5da5774b778f39c7fd94b2a3022a,5d8d88c8c0eec230de8f1f60e0920a4337939a88)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2323b276308a5da5774b778f39c7fd94b2a3022a,f517646e008fe99ca1800601cd011b110f8684ae)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2323b276308a5da5774b778f39c7fd94b2a3022a,3848ae00b1642e2c98ff8cbfd2d3b38c6f53b5c3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2323b276308a5da5774b778f39c7fd94b2a3022a,43c68a2c7cc35b7c2a83c285cb4ad3d472b8caa2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2323b276308a5da5774b778f39c7fd94b2a3022a,d07d97ca4f7fac467cdcf4a012690853958b7e89)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2323b276308a5da5774b778f39c7fd94b2a3022a,101ab946b79ad83b36d5cfd47de587492a80acf0)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "2.6.30"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,2.6.30)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.10.253,5.11.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.203,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.168,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.134,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.81,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.22,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.12,6.20.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-05-01T23:30:06.228067+00:00", "updated": "2026-05-07T20:30:15.262129+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}