{"id":"CVE-2026-98457","revision":"84bd4d41efba4f8e8e90720a029bf8bc","records":[{"revision":"84bd4d41efba4f8e8e90720a029bf8bc","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-98457","aliases":[],"title":"Bluetooth: L2CAP: validate frame length before control and FCS access","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: validate frame length before control and FCS access\n\nl2cap_data_rcv() unpacks either a two-byte or four-byte control field\nwithout first ensuring that it is present. A short ERTM or streaming-mode\nframe can therefore cause an out-of-bounds read.\n\nThere is a second short-frame case when CRC16 is enabled. After the\ncontrol field is pulled, l2cap_check_fcs() subtracts two from skb->len\nwithout checking it. If fewer than two bytes remain, the subtraction\nwraps; skb_trim() leaves the buffer unchanged and the subsequent FCS\nload reads past the logical end of the frame.\n\nValidate that the frame contains both its control field and, when\nenabled, its FCS before either field is accessed.","state":0,"publishedAt":"2026-10-18T15:15:06.718+00:00","modifiedAt":"2026-10-19T09:19:53.885+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/bluetooth/l2cap_core.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a\",\n                            \"lessThan\": \"4373ba79a267947e771c438507f7b103e30bdb21\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a\",\n                            \"lessThan\": \"965bd88ed4b4763cb765dd65885adcfa588c6b14\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a\",\n                            \"lessThan\": \"3acf6a0038ec0d4e8f4dcbfc2a557dff5f61cb70\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a\",\n                            \"lessThan\": \"8c7556c7cd17e073bbefdc4a9a4694a207544c37\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a\",\n                            \"lessThan\": \"1fdbb2a712a9a162ee817c959740face80b3d929\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a\",\n                            \"lessThan\": \"c6a288e6001bcce16553c3853e0f5a45eaaf85c7\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a\",\n                            \"lessThan\": \"f557274af7b94b6134692e6f26b880f1e34c15bf\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a\",\n                            \"lessThan\": \"6c78a213d9070b610c7f418af2c25b66180b7e37\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/bluetooth/l2cap_core.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"2.6.32\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"2.6.32\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.271\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.222\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.189\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.158\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.112\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.55\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.9\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/4373ba79a267947e771c438507f7b103e30bdb21","https://git.kernel.org/stable/c/965bd88ed4b4763cb765dd65885adcfa588c6b14","https://git.kernel.org/stable/c/3acf6a0038ec0d4e8f4dcbfc2a557dff5f61cb70","https://git.kernel.org/stable/c/8c7556c7cd17e073bbefdc4a9a4694a207544c37","https://git.kernel.org/stable/c/1fdbb2a712a9a162ee817c959740face80b3d929","https://git.kernel.org/stable/c/c6a288e6001bcce16553c3853e0f5a45eaaf85c7","https://git.kernel.org/stable/c/f557274af7b94b6134692e6f26b880f1e34c15bf","https://git.kernel.org/stable/c/6c78a213d9070b610c7f418af2c25b66180b7e37"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98457","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-98457","identifiers":["CVE-2026-98457"]},"retained":false,"historicalAffected":[]}],"coverage":[]}