CVE-2026-31721

{"id": "CVE-2026-31721", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 1.8}]}, "affected": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "affectedData": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "cb382536052fcc7713988869b54a81137069e5a9", "lessThan": "13440c0db227c5db01da751ed966dde4cdd2ea18", "versionType": "git"}, {"status": "affected", "version": "cb382536052fcc7713988869b54a81137069e5a9", "lessThan": "de93e0862169b5539e00c2b9980b93fd80c37c0d", "versionType": "git"}, {"status": "affected", "version": "cb382536052fcc7713988869b54a81137069e5a9", "lessThan": "81aee4500055876883658b024b6fb61801afe134", "versionType": "git"}, {"status": "affected", "version": "cb382536052fcc7713988869b54a81137069e5a9", "lessThan": "8ec6a58586f195a88479edcdb0b8027c39f12d03", "versionType": "git"}, {"status": "affected", "version": "cb382536052fcc7713988869b54a81137069e5a9", "lessThan": "f7d00ee1c8082c8a134340aaf16d71a27e29c362", "versionType": "git"}, {"status": "affected", "version": "cb382536052fcc7713988869b54a81137069e5a9", "lessThan": "5d1bb391ceeebb28327703dd07af8c6324af298f", "versionType": "git"}, {"status": "affected", "version": "cb382536052fcc7713988869b54a81137069e5a9", "lessThan": "26a879a41ed960b3fb4ec773ef2788c515c0e488", "versionType": "git"}, {"status": "affected", "version": "cb382536052fcc7713988869b54a81137069e5a9", "lessThan": "4e0a88254ad59f6c53a34bf5fa241884ec09e8b2", "versionType": "git"}], "programFiles": ["drivers/usb/gadget/function/f_hid.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "3.19"}, {"status": "unaffected", "version": "0", "lessThan": "3.19", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.253", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.203", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.169", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.135", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.81", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.22", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "6.19.12", "versionType": "semver", "lessThanOrEqual": "6.19.*"}, {"status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/usb/gadget/function/f_hid.c"], "defaultStatus": "affected"}]}], "published": "2026-05-01T15:16:34.490", "references": [{"url": "https://git.kernel.org/stable/c/13440c0db227c5db01da751ed966dde4cdd2ea18", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/26a879a41ed960b3fb4ec773ef2788c515c0e488", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/4e0a88254ad59f6c53a34bf5fa241884ec09e8b2", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/5d1bb391ceeebb28327703dd07af8c6324af298f", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/81aee4500055876883658b024b6fb61801afe134", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/8ec6a58586f195a88479edcdb0b8027c39f12d03", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/de93e0862169b5539e00c2b9980b93fd80c37c0d", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/f7d00ee1c8082c8a134340aaf16d71a27e29c362", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "NVD-CWE-noinfo"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_hid: move list and spinlock inits from bind to alloc\n\nThere was an issue when you did the following:\n- setup and bind an hid gadget\n- open /dev/hidg0\n- use the resulting fd in EPOLL_CTL_ADD\n- unbind the UDC\n- bind the UDC\n- use the fd in EPOLL_CTL_DEL\n\nWhen CONFIG_DEBUG_LIST was enabled, a list_del corruption was reported\nwithin remove_wait_queue (via ep_remove_wait_queue). After some\ndebugging I found out that the queues, which f_hid registers via\npoll_wait were the problem. These were initialized using\ninit_waitqueue_head inside hidg_bind. So effectively, the bind function\nre-initialized the queues while there were still items in them.\n\nThe solution is to move the initialization from hidg_bind to hidg_alloc\nto extend their lifetimes to the lifetime of the function instance.\n\nAdditionally, I found many other possibly problematic init calls in the\nbind function, which I moved as well."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nusb: gadget: f_hid: mover inicializaciones de lista y spinlock de bind a alloc\n\nHubo un problema cuando se hizo lo siguiente:\n- configurar y enlazar un gadget hid\n- abrir /dev/hidg0\n- usar el fd resultante en EPOLL_CTL_ADD\n- desenlazar el UDC\n- enlazar el UDC\n- usar el fd en EPOLL_CTL_DEL\n\nCuando CONFIG_DEBUG_LIST estaba habilitado, se inform\u00f3 una corrupci\u00f3n de list_del dentro de remove_wait_queue (a trav\u00e9s de ep_remove_wait_queue). Despu\u00e9s de alguna depuraci\u00f3n, descubr\u00ed que las colas, que f_hid registra a trav\u00e9s de poll_wait, eran el problema. Estas se inicializaban usando init_waitqueue_head dentro de hidg_bind. As\u00ed que, efectivamente, la funci\u00f3n bind reinicializaba las colas mientras todav\u00eda hab\u00eda elementos en ellas.\n\nLa soluci\u00f3n es mover la inicializaci\u00f3n de hidg_bind a hidg_alloc para extender sus vidas \u00fatiles a la vida \u00fatil de la instancia de la funci\u00f3n.\n\nAdem\u00e1s, encontr\u00e9 muchas otras llamadas de inicializaci\u00f3n posiblemente problem\u00e1ticas en la funci\u00f3n bind, las cuales tambi\u00e9n mov\u00ed."}], "lastModified": "2026-11-11T21:10:00.200", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "86625D80-8DDF-4C85-86FD-F543ECDDFBA4", "versionEndExcluding": "5.10.253", "versionStartIncluding": "3.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "20DDB3E9-AABF-4107-ADB0-5362AA067045", "versionEndExcluding": "5.15.203", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "DBEC0E5D-641C-4E98-A6D9-5799B10CE451", "versionEndExcluding": "6.1.169", "versionStartIncluding": "5.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "15C1A1B2-14EE-494C-AF3E-D5A7BA640B39", "versionEndExcluding": "6.6.135", "versionStartIncluding": "6.2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "6EF80433-B33B-43C5-8E64-0FA7B8DCE1BC", "versionEndExcluding": "6.12.81", "versionStartIncluding": "6.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "C9DF8BCE-36D3-475D-9D21-19E4F02F9029", "versionEndExcluding": "6.18.22", "versionStartIncluding": "6.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "0A2B9540-02D5-41B4-B16A-82AF66FD4F36", "versionEndExcluding": "6.19.12", "versionStartIncluding": "6.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F253B622-8837-4245-BCE5-A7BF8FC76A16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F666C8D8-6538-46D4-B318-87610DE64C34"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "02259FDA-961B-47BC-AE7F-93D7EC6E90C2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "58A9FEFF-C040-420D-8F0A-BFDAAA1DF258"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "1D2315C0-D46F-4F85-9754-F9E5E11374A6"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}