CVE-2026-31755

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This leads to a NULL pointer dereference when\n__cdns3_gadget_ep_queue() is called, causing a kernel crash.\n\nAdd a check to return -ESHUTDOWN if ep->desc is NULL, which is the\nstandard return code for unconfigured endpoints.\n\nThis prevents potential crashes when ep_queue is called on endpoints\nthat are not ready."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/usb/cdns3/cdns3-gadget.c"], "versions": [{"version": "7733f6c32e36ff9d7adadf40001039bf219b1cbe", "lessThan": "3cf0580a09d417eab41ce914a11f9cde3a121871", "status": "affected", "versionType": "git"}, {"version": "7733f6c32e36ff9d7adadf40001039bf219b1cbe", "lessThan": "3d1433fe34b224b90259e207e5389e95b504ef04", "status": "affected", "versionType": "git"}, {"version": "7733f6c32e36ff9d7adadf40001039bf219b1cbe", "lessThan": "fb2ad0c1334a3eccfe4ed203f9eef5a4879226f6", "status": "affected", 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"https://git.kernel.org/stable/c/7f6f127b9bc34bed35f56faf7ecb1561d6b39000"}], "title": "usb: cdns3: gadget: fix NULL pointer dereference in ep_queue", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

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"descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: cdns3: gadget: fix NULL pointer dereference in ep_queue\n\nWhen the gadget endpoint is disabled or not yet configured, the ep->desc\npointer can be NULL. This leads to a NULL pointer dereference when\n__cdns3_gadget_ep_queue() is called, causing a kernel crash.\n\nAdd a check to return -ESHUTDOWN if ep->desc is NULL, which is the\nstandard return code for unconfigured endpoints.\n\nThis prevents potential crashes when ep_queue is called on endpoints\nthat are not ready."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad:\n\nusb: cdns3: gadget: correcci\u00f3n de desreferencia de puntero NULL en ep_queue\n\nCuando el endpoint del gadget est\u00e1 deshabilitado o a\u00fan no configurado, el puntero ep -> desc puede ser NULL. Esto provoca una desreferencia de puntero NULL cuando se llama a __cdns3_gadget_ep_queue(), causando un fallo del kernel.\n\nSe a\u00f1ade una comprobaci\u00f3n para devolver -ESHUTDOWN si ep -> desc es NULL, que es el c\u00f3digo de retorno est\u00e1ndar para endpoints no configurados.\n\nEsto evita posibles fallos cuando se llama a ep_queue en endpoints que no est\u00e1n listos."}], "id": "CVE-2026-31755", "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": "2026-05-01T15:16:38.460", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/14bf08ab2cdfcdfd3f13e799d06692a1b3e0745f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/390536cc6af4ca5566bc3bf1f8b704700380cd2c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3cf0580a09d417eab41ce914a11f9cde3a121871"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3d1433fe34b224b90259e207e5389e95b504ef04"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7f6f127b9bc34bed35f56faf7ecb1561d6b39000"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9ab9b0e5fcdac325f950fc8b6caa08a9e22a0db9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d61446dfc9d387775bb1b95b081953201b9222af"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/fb2ad0c1334a3eccfe4ed203f9eef5a4879226f6"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: usb: cdns3: gadget: fix NULL pointer dereference in ep_queue", "id": "2464477", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2464477"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-476", "details": ["A flaw was found in the Linux kernel's cdns3 USB gadget driver. When a gadget endpoint is disabled or not yet configured, a NULL pointer dereference can occur in the `ep_queue` function. This can lead to a kernel crash, resulting in a denial of service (DoS) on the affected system."], "name": "CVE-2026-31755", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "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-2026-31755\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31755\nhttps://lore.kernel.org/linux-cve-announce/2026050143-CVE-2026-31755-c004@gregkh/T"], "threat_severity": "Moderate"}

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