CVE-2026-23461

{"id": "CVE-2026-23461", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 8.8, "attackVector": "ADJACENT_NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 2.8}]}, "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": "efc30877bd4bc85fefe98d80af60fafc86e5775e", "lessThan": "11a87dd5df428a4b79a84d2790cac7f3c73f1f0d", "versionType": "git"}, {"status": "affected", "version": "f87271d21dd4ee83857ca11b94e7b4952749bbae", "lessThan": "c22a5e659959eb77c2fbb58a5adfaf3c3dab7abf", "versionType": "git"}, {"status": "affected", "version": "ab4eedb790cae44313759b50fe47da285e2519d5", "lessThan": "da3000cbe4851458a22be38bb18c0689c39fdd5f", "versionType": "git"}, {"status": "affected", "version": "ab4eedb790cae44313759b50fe47da285e2519d5", "lessThan": "71030f3b3015a412133a805ff47970cdcf30c2b8", "versionType": "git"}, {"status": "affected", "version": "ab4eedb790cae44313759b50fe47da285e2519d5", "lessThan": "752a6c9596dd25efd6978a73ff21f3b592668f4a", "versionType": "git"}, {"status": "affected", "version": "18ab6b6078fa8191ca30a3065d57bf35d5635761", "versionType": "git"}, {"status": "affected", "version": "6.6.84", "lessThan": "6.6.130", "versionType": "semver"}, {"status": "affected", "version": "6.12.20", "lessThan": "6.12.78", "versionType": "semver"}, {"status": "affected", "version": "6.13.8", "lessThan": "6.14", "versionType": "semver"}], "programFiles": ["net/bluetooth/l2cap_core.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.14"}, {"status": "unaffected", "version": "0", "lessThan": "6.14", "versionType": "semver"}, {"status": "unaffected", "version": "6.6.130", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.78", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.20", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "6.19.10", "versionType": "semver", "lessThanOrEqual": "6.19.*"}, {"status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/bluetooth/l2cap_core.c"], "defaultStatus": "affected"}]}], "published": "2026-04-03T16:16:33.140", "references": [{"url": "https://git.kernel.org/stable/c/11a87dd5df428a4b79a84d2790cac7f3c73f1f0d", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/71030f3b3015a412133a805ff47970cdcf30c2b8", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/752a6c9596dd25efd6978a73ff21f3b592668f4a", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/c22a5e659959eb77c2fbb58a5adfaf3c3dab7abf", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/da3000cbe4851458a22be38bb18c0689c39fdd5f", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-416"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: Fix use-after-free in l2cap_unregister_user\n\nAfter commit ab4eedb790ca (\"Bluetooth: L2CAP: Fix corrupted list in\nhci_chan_del\"), l2cap_conn_del() uses conn->lock to protect access to\nconn->users. However, l2cap_register_user() and l2cap_unregister_user()\ndon't use conn->lock, creating a race condition where these functions can\naccess conn->users and conn->hchan concurrently with l2cap_conn_del().\n\nThis can lead to use-after-free and list corruption bugs, as reported\nby syzbot.\n\nFix this by changing l2cap_register_user() and l2cap_unregister_user()\nto use conn->lock instead of hci_dev_lock(), ensuring consistent locking\nfor the l2cap_conn structure."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nBluetooth: L2CAP: Correcci\u00f3n de uso despu\u00e9s de liberaci\u00f3n en l2cap_unregister_user\n\nDespu\u00e9s del commit ab4eedb790ca ('Bluetooth: L2CAP: Correcci\u00f3n de lista corrupta en hci_chan_del'), l2cap_conn_del() utiliza conn -> lock para proteger el acceso a conn -> users. Sin embargo, l2cap_register_user() y l2cap_unregister_user() no utilizan conn -> lock, creando una condici\u00f3n de carrera donde estas funciones pueden acceder a conn -> users y conn -> hchan concurrentemente con l2cap_conn_del().\n\nEsto puede llevar a uso despu\u00e9s de liberaci\u00f3n y errores de corrupci\u00f3n de lista, seg\u00fan lo informado por syzbot.\n\nEsto se corrige cambiando l2cap_register_user() y l2cap_unregister_user() para que utilicen conn -> lock en lugar de hci_dev_lock(), asegurando un bloqueo consistente para la estructura l2cap_conn."}], "lastModified": "2026-07-24T22:10:00.140", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "A87F64C1-AF3B-48DC-89AD-A8C7069BFBA8", "versionEndExcluding": "6.6.130", "versionStartIncluding": "6.6.84"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "EDA52060-BD07-4881-B1B9-27DD1F069333", "versionEndExcluding": "6.12.78", "versionStartIncluding": "6.12.20"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "366CEEDE-ED7E-4CD5-A00F-927D6C249DFD", "versionEndExcluding": "6.14", "versionStartIncluding": "6.13.8"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "BD54E28E-E5DD-4B1B-9B3C-D90CA91313C7", "versionEndExcluding": "6.18.20", "versionStartIncluding": "6.14.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "96D34333-38BE-4414-9E79-6EB764329581", "versionEndExcluding": "6.19.10", "versionStartIncluding": "6.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.14:-:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "7DE421BA-0600-4401-A175-73CAB6A6FB4E"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.14:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "66619FB8-0AAF-4166-B2CF-67B24143261D"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.14:rc4:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "D3D6550E-6679-4560-902D-AF52DCFE905B"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.14:rc5:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "45B90F6B-BEC7-4D4E-883A-9DBADE021750"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.14:rc6:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "1759FFB7-531C-41B1-9AE1-FD3D80E0D920"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.14:rc7:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "AD948719-8628-4421-A340-1066314BBD4A"}, {"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"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}