CVE-2026-23009

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Also make sure endpoint is\nrunning before attempting to stop it.\n\nRemove the xhci_initialize_ring_info() call during sideband endpoint\nremoval as is it only initializes ring structure enqueue, dequeue and\ncycle state values to their starting values without changing actual\nhardware enqueue, dequeue and cycle state. Leaving them out of sync\nis worse than leaving it as it is. The endpoint will get freed in after\nthis in most usecases.\n\nIf the (audio) class driver want's to reuse the endpoint after offload\nthen it is up to the class driver to ensure endpoint is properly set up."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nxhci: banda lateral: no desreferenciar el anillo liberado al eliminar el punto final de banda lateral\n\nxhci_sideband_remove_endpoint() asume incorrectamente que el punto final est\u00e1 en ejecuci\u00f3n y tiene un anillo de transferencia v\u00e1lido.\n\nLianqin inform\u00f3 de un fallo durante las pruebas de estr\u00e9s de suspensi\u00f3n/activaci\u00f3n, y encontr\u00f3 que la causa era la desreferenciaci\u00f3n de un anillo de transferencia inexistente 'ep->ring' durante xhci_sideband_remove_endpoint().\n\nEl punto final y su anillo pueden estar en un estado desconocido si esta funci\u00f3n se llama despu\u00e9s de que xHCI fuera reinicializado en la reanudaci\u00f3n (p\u00e9rdida de energ\u00eda), o si el dispositivo est\u00e1 siendo reenumerado, desconectado o el punto final ya ha sido descartado.\n\nSolucione esto eliminando el acceso innecesario al anillo y comprobando que 'ep->ring' existe antes de desreferenciarlo. Tambi\u00e9n aseg\u00farese de que el punto final est\u00e9 en ejecuci\u00f3n antes de intentar detenerlo.\n\nElimine la llamada a xhci_initialize_ring_info() durante la eliminaci\u00f3n del punto final de banda lateral, ya que solo inicializa los valores de estado de encolamiento, desencolamiento y ciclo de la estructura del anillo a sus valores iniciales sin cambiar el estado real de encolamiento, desencolamiento y ciclo del hardware. Dejarlos fuera de sincronizaci\u00f3n es peor que dejarlo como est\u00e1. El punto final ser\u00e1 liberado despu\u00e9s de esto en la mayor\u00eda de los casos de uso.\n\nSi el controlador de clase (de audio) desea reutilizar el punto final despu\u00e9s de la descarga, entonces es responsabilidad del controlador de clase asegurar que el punto final est\u00e9 configurado correctamente."}], "id": "CVE-2026-23009", "lastModified": "2026-11-05T22:18:00.007", "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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-23009", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-05T21:18:33.819863Z", "version": "2.0.3"}}]}, "published": "2026-01-25T15:15:55.767", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/34f6634dba87ef72b3c3a3a524be663adef7ab42"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/dd83dc1249737b837ac5d57c81f2b0977c613d9f"}], "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: xhci: sideband: don't dereference freed ring when removing sideband endpoint", "id": "2432669", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2432669"}, "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"}, "details": ["No description is available for this CVE."], "name": "CVE-2026-23009", "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": "Out of support scope", "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": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-01-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-23009\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-23009\nhttps://lore.kernel.org/linux-cve-announce/2026012537-CVE-2026-23009-7209@gregkh/T"], "threat_severity": "Low"}

{"analysis": {"en": {"generated_at": "2026-04-18T15:05:04.384640+00:00", "value": {"mitigation_remediation": ["Apply the latest patched Linux kernel release that eliminates the dangling pointer dereference and adds NULL checks for the endpoint ring.", "Reboot the system and avoid suspending USB devices until the kernel patch is deployed; this limits the impact of any pending sideband removal operations.", "Ensure USB class drivers that reinitialize endpoints after offload correctly re\u2011setup the endpoint structures or temporarily disable that functionality until the kernel fix is in place."], "summary": {"action": "Immediate Patch", "impact": "Denial of Service via kernel crash"}, "threat_synthesis": {"affected_systems": "Kernel builds that include the xHCI sideband driver, specifically Linux kernel releases from 6.16 onward and all 6.19 release\u2011candidate series (rc1 through rc8). Any system running these kernels with standard USB subsystem enabled is susceptible.\n", "description_and_impact": "The Linux kernel routine that removes a sideband USB endpoint incorrectly assumes the endpoint\u2019s transfer ring is still valid. When the ring has been freed or never initialized, the routine dereferences a dangling pointer, causing a kernel panic. If this occurs during suspend, wake\u2011up, or device re\u2011enumeration, a local user or an attacker who can influence USB device state can trigger a crash, resulting in system reboot or unavailability.\n", "risk_and_exploitability": "The CVSS base score is 5.5, indicating moderate severity. EPSS is less than 1%, and the vulnerability is not noted in CISA\u2019s KEV catalog. The attack vector is likely a local or device\u2011side event during USB suspend/resume or re\u2011enumeration, rather than a remote network attack. Although the crash does not directly compromise confidentiality or integrity, it can be used to disrupt availability, especially in environments where USB devices are frequently suspended or reconnected."}}}}, "created": "2026-04-18T15:15:03.688775+00:00", "updated": "2026-04-18T15:15:03.688786+00:00", "vendors": [], "weaknesses": ["CWE-416"]}