CVE-2026-31728

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-31728", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-03-09T15:48:24.134Z", "datePublished": "2026-05-01T14:14:28.231Z", "dateUpdated": "2026-05-11T22:14:36.858Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T22:14:36.858Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: u_ether: Fix race between gether_disconnect and eth_stop\n\nA race condition between gether_disconnect() and eth_stop() leads to a\nNULL pointer dereference. Specifically, if eth_stop() is triggered\nconcurrently while gether_disconnect() is tearing down the endpoints,\neth_stop() attempts to access the cleared endpoint descriptor, causing\nthe following NPE:\n\n Unable to handle kernel NULL pointer dereference\n Call trace:\n __dwc3_gadget_ep_enable+0x60/0x788\n dwc3_gadget_ep_enable+0x70/0xe4\n usb_ep_enable+0x60/0x15c\n eth_stop+0xb8/0x108\n\nBecause eth_stop() crashes while holding the dev->lock, the thread\nrunning gether_disconnect() fails to acquire the same lock and spins\nforever, resulting in a hardlockup:\n\n Core - Debugging Information for Hardlockup core(7)\n Call trace:\n queued_spin_lock_slowpath+0x94/0x488\n _raw_spin_lock+0x64/0x6c\n gether_disconnect+0x19c/0x1e8\n ncm_set_alt+0x68/0x1a0\n composite_setup+0x6a0/0xc50\n\nThe root cause is that the clearing of dev->port_usb in\ngether_disconnect() is delayed until the end of the function.\n\nMove the clearing of dev->port_usb to the very beginning of\ngether_disconnect() while holding dev->lock. This cuts off the link\nimmediately, ensuring eth_stop() will see dev->port_usb as NULL and\nsafely bail out."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/usb/gadget/function/u_ether.c"], "versions": [{"version": "2b3d942c4878084a37991a65e66512c02b8fa2ad", "lessThan": "f02980594deef751e42133714aee25228f1494c6", "status": "affected", "versionType": "git"}, {"version": "2b3d942c4878084a37991a65e66512c02b8fa2ad", "lessThan": "e1e7a66584bf0aff3becb73c19fa31527889fc9e", "status": "affected", "versionType": "git"}, {"version": "2b3d942c4878084a37991a65e66512c02b8fa2ad", "lessThan": "a259ba0bce3b192c04334499690372a250f7d0b1", "status": "affected", "versionType": "git"}, {"version": "2b3d942c4878084a37991a65e66512c02b8fa2ad", "lessThan": "f6813c2b2ae78def76b69e0f9d72f80e4a1c4aca", "status": "affected", "versionType": "git"}, {"version": "2b3d942c4878084a37991a65e66512c02b8fa2ad", "lessThan": "bbb09bb89ffa571475f66daca9482b974cd29d6a", "status": "affected", "versionType": "git"}, {"version": "2b3d942c4878084a37991a65e66512c02b8fa2ad", "lessThan": "6ad77458637b78ec655e3da5f112c862e6690a9d", "status": "affected", "versionType": "git"}, {"version": "2b3d942c4878084a37991a65e66512c02b8fa2ad", "lessThan": "8ff689edfeceb5e3ec1623e09af2b2aa0f1098a8", "status": "affected", "versionType": "git"}, {"version": "2b3d942c4878084a37991a65e66512c02b8fa2ad", "lessThan": "e1eabb072c75681f78312c484ccfffb7430f206e", "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/usb/gadget/function/u_ether.c"], "versions": [{"version": "2.6.27", "status": "affected"}, {"version": "0", "lessThan": "2.6.27", "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": "6.1.169", "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": "2.6.27", "versionEndExcluding": "5.10.253"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "5.15.203"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "6.1.169"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "6.6.134"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "6.12.81"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "6.18.22"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "6.19.12"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/f02980594deef751e42133714aee25228f1494c6"}, {"url": "https://git.kernel.org/stable/c/e1e7a66584bf0aff3becb73c19fa31527889fc9e"}, {"url": "https://git.kernel.org/stable/c/a259ba0bce3b192c04334499690372a250f7d0b1"}, {"url": "https://git.kernel.org/stable/c/f6813c2b2ae78def76b69e0f9d72f80e4a1c4aca"}, {"url": "https://git.kernel.org/stable/c/bbb09bb89ffa571475f66daca9482b974cd29d6a"}, {"url": "https://git.kernel.org/stable/c/6ad77458637b78ec655e3da5f112c862e6690a9d"}, {"url": "https://git.kernel.org/stable/c/8ff689edfeceb5e3ec1623e09af2b2aa0f1098a8"}, {"url": "https://git.kernel.org/stable/c/e1eabb072c75681f78312c484ccfffb7430f206e"}], "title": "usb: gadget: u_ether: Fix race between gether_disconnect and eth_stop", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

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{"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.203", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.169", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.134", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.81", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.22", "versionType": "semver"}, {"lessThanOrEqual": "6.19.*", "status": "unaffected", "version": "6.19.12", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "A01FA99D-A279-4156-BCB7-C23B63339A60", "versionEndExcluding": "5.10.253", "versionStartIncluding": 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"vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*", "matchCriteriaId": "1D2315C0-D46F-4F85-9754-F9E5E11374A6", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: u_ether: Fix race between gether_disconnect and eth_stop\n\nA race condition between gether_disconnect() and eth_stop() leads to a\nNULL pointer dereference. Specifically, if eth_stop() is triggered\nconcurrently while gether_disconnect() is tearing down the endpoints,\neth_stop() attempts to access the cleared endpoint descriptor, causing\nthe following NPE:\n\n Unable to handle kernel NULL pointer dereference\n Call trace:\n __dwc3_gadget_ep_enable+0x60/0x788\n dwc3_gadget_ep_enable+0x70/0xe4\n usb_ep_enable+0x60/0x15c\n eth_stop+0xb8/0x108\n\nBecause eth_stop() crashes while holding the dev->lock, the thread\nrunning gether_disconnect() fails to acquire the same lock and spins\nforever, resulting in a hardlockup:\n\n Core - Debugging Information for Hardlockup core(7)\n Call trace:\n queued_spin_lock_slowpath+0x94/0x488\n _raw_spin_lock+0x64/0x6c\n gether_disconnect+0x19c/0x1e8\n ncm_set_alt+0x68/0x1a0\n composite_setup+0x6a0/0xc50\n\nThe root cause is that the clearing of dev->port_usb in\ngether_disconnect() is delayed until the end of the function.\n\nMove the clearing of dev->port_usb to the very beginning of\ngether_disconnect() while holding dev->lock. This cuts off the link\nimmediately, ensuring eth_stop() will see dev->port_usb as NULL and\nsafely bail out."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nusb: gadget: u_ether: Corrige condici\u00f3n de carrera entre gether_disconnect y eth_stop\n\nUna condici\u00f3n de carrera entre gether_disconnect() y eth_stop() conduce a una desreferencia de puntero NULL. Espec\u00edficamente, si eth_stop() se activa concurrentemente mientras gether_disconnect() est\u00e1 desmantelando los puntos finales, eth_stop() intenta acceder al descriptor de punto final borrado, causando el siguiente NPE:\n\n No se puede manejar la desreferencia de puntero NULL del kernel\n Rastro de llamada:\n __dwc3_gadget_ep_enable+0x60/0x788\n dwc3_gadget_ep_enable+0x70/0xe4\n usb_ep_enable+0x60/0x15c\n eth_stop+0xb8/0x108\n\nDebido a que eth_stop() falla mientras mantiene el dev -> lock, el hilo que ejecuta gether_disconnect() no logra adquirir el mismo bloqueo y gira indefinidamente, resultando en un bloqueo total:\n\n N\u00facleo - Informaci\u00f3n de depuraci\u00f3n para bloqueo total del n\u00facleo (7)\n Rastro de llamada:\n queued_spin_lock_slowpath+0x94/0x488\n _raw_spin_lock+0x64/0x6c\n gether_disconnect+0x19c/0x1e8\n ncm_set_alt+0x68/0x1a0\n composite_setup+0x6a0/0xc50\n\nLa causa ra\u00edz es que el borrado de dev -> port_usb en gether_disconnect() se retrasa hasta el final de la funci\u00f3n.\n\nMover el borrado de dev -> port_usb al principio de gether_disconnect() mientras se mantiene dev -> lock. Esto corta el enlace inmediatamente, asegurando que eth_stop() ver\u00e1 dev -> port_usb como NULL y saldr\u00e1 de forma segura."}], "id": "CVE-2026-31728", "lastModified": "2026-11-11T21:10:00.200", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 4.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2026-05-01T15:16:35.333", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6ad77458637b78ec655e3da5f112c862e6690a9d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8ff689edfeceb5e3ec1623e09af2b2aa0f1098a8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a259ba0bce3b192c04334499690372a250f7d0b1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bbb09bb89ffa571475f66daca9482b974cd29d6a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e1e7a66584bf0aff3becb73c19fa31527889fc9e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e1eabb072c75681f78312c484ccfffb7430f206e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f02980594deef751e42133714aee25228f1494c6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f6813c2b2ae78def76b69e0f9d72f80e4a1c4aca"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-362"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: usb: gadget: u_ether: Fix race between gether_disconnect and eth_stop", "id": "2464472", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2464472"}, "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-367", "details": ["A flaw was found in the Linux kernel's `usb: gadget: u_ether` module. A race condition between the `gether_disconnect()` and `eth_stop()` functions can lead to a NULL pointer dereference. This occurs when `eth_stop()` is triggered concurrently while `gether_disconnect()` is tearing down USB endpoints. The vulnerability can cause a system hardlockup, resulting in a Denial of Service (DoS)."], "name": "CVE-2026-31728", "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-2026-31728\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31728\nhttps://lore.kernel.org/linux-cve-announce/2026050136-CVE-2026-31728-47b6@gregkh/T"], "threat_severity": "Moderate"}

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