{"id":"CVE-2026-31498","summary":"Bluetooth: L2CAP: Fix ERTM re-init and zero pdu_len infinite loop","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: Fix ERTM re-init and zero pdu_len infinite loop\n\nl2cap_config_req() processes CONFIG_REQ for channels in BT_CONNECTED\nstate to support L2CAP reconfiguration (e.g. MTU changes). However,\nsince both CONF_INPUT_DONE and CONF_OUTPUT_DONE are already set from\nthe initial configuration, the reconfiguration path falls through to\nl2cap_ertm_init(), which re-initializes tx_q, srej_q, srej_list, and\nretrans_list without freeing the previous allocations and sets\nchan-\u003esdu to NULL without freeing the existing skb. This leaks all\npreviously allocated ERTM resources.\n\nAdditionally, l2cap_parse_conf_req() does not validate the minimum\nvalue of remote_mps derived from the RFC max_pdu_size option. A zero\nvalue propagates to l2cap_segment_sdu() where pdu_len becomes zero,\ncausing the while loop to never terminate since len is never\ndecremented, exhausting all available memory.\n\nFix the double-init by skipping l2cap_ertm_init() and\nl2cap_chan_ready() when the channel is already in BT_CONNECTED state,\nwhile still allowing the reconfiguration parameters to be updated\nthrough l2cap_parse_conf_req(). Also add a pdu_len zero check in\nl2cap_segment_sdu() as a safeguard.","modified":"2026-06-19T08:29:23.369542231Z","published":"2026-04-22T13:54:19.714Z","related":["SUSE-SU-2026:2450-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31498.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/042e2cd4bb11e5313b19b87593616524949e4c52"},{"type":"WEB","url":"https://git.kernel.org/stable/c/25f420a0d4cfd61d3d23ec4b9c56d9f443d91377"},{"type":"WEB","url":"https://git.kernel.org/stable/c/52667c859fe33f70c2e711cb81bbd505d5eb8e75"},{"type":"WEB","url":"https://git.kernel.org/stable/c/900e4db5385ec2cacd372345a80ab9c8e105b3a3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9760b83cfd24b38caee663f429011a0dd6064fa9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9a21a631ee034b1573dce14b572a24943dbfd7ae"},{"type":"WEB","url":"https://git.kernel.org/stable/c/de37e2655b7abc3f59254c6b72256840f39fc6d5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e7aab23b7df89a3d754a5f0a7d2237548b328bd0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31498.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-31498"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"96298f640104e4cd9a913a6e50b0b981829b94ff"},{"fixed":"9760b83cfd24b38caee663f429011a0dd6064fa9"},{"fixed":"de37e2655b7abc3f59254c6b72256840f39fc6d5"},{"fixed":"e7aab23b7df89a3d754a5f0a7d2237548b328bd0"},{"fixed":"52667c859fe33f70c2e711cb81bbd505d5eb8e75"},{"fixed":"9a21a631ee034b1573dce14b572a24943dbfd7ae"},{"fixed":"900e4db5385ec2cacd372345a80ab9c8e105b3a3"},{"fixed":"042e2cd4bb11e5313b19b87593616524949e4c52"},{"fixed":"25f420a0d4cfd61d3d23ec4b9c56d9f443d91377"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"4ad03ff6f680681c5f78254e37c4c856fa953629"},{"last_affected":"b7d0ca715c1008acd2fc018f02a56fed88f78b75"},{"last_affected":"799263eb37a4f7f6d39334046929c3bc92452a7f"},{"last_affected":"8828622fb9b4201eeb0870587052e3d834cfaf61"},{"last_affected":"b432ea85ab8472763870dd0f2c186130dd36d68c"}]}],"versions":["v4.9.237","v5.4.68","v4.19.148","v4.14.199","v4.4.237","v5.4.67","v4.19.147","v5.4.66","v4.19.146","v4.14.198","v4.9.236","v4.4.236","v5.4.65","v4.19.145","v5.4.64","v4.19.144","v4.14.197","v4.9.235","v4.4.235","v5.4.63","v4.19.143","v4.14.196","v5.4.62","v5.4.61","v4.19.142","v4.14.195","v4.9.234","v4.4.234","v5.4.60","v4.19.141","v4.14.194","v4.9.233","v4.4.233","v5.4.59","v4.19.140","v4.9.232","v4.4.232","v4.14.193","v5.4.58","v4.19.139","v5.4.57","v4.19.138","v4.14.192","v4.19.137","v5.4.56","v4.14.191","v4.19.136","v5.4.55","v5.4.54","v4.19.135","v4.14.190","v4.9.231","v4.4.231","v5.4.53","v4.19.134","v4.14.189","v5.4.52","v4.19.133","v4.14.188","v4.9.230","v4.4.230","v4.19.132","v5.4.51","v5.4.50","v4.19.131","v4.14.187","v4.9.229","v4.4.229","v4.19.130","v4.9.228","v4.14.186","v5.4.49","v4.4.228","v4.14.185","v4.19.129","v5.4.48","v5.4.47","v4.19.128","v4.14.184","v4.9.227","v4.4.227","v5.4.46","v4.14.183","v4.9.226","v4.4.226","v4.19.127","v5.4.45","v5.4.44","v4.19.126","v5.4.43","v4.19.125","v4.14.182","v4.9.225","v4.4.225","v5.4.42","v4.19.124","v4.14.181","v4.9.224","v4.4.224","v5.4.41","v4.19.123","v4.14.180","v4.9.223","v4.4.223","v5.4.40","v4.19.122","v5.4.39","v4.19.121","v4.14.179","v4.9.222","v4.4.222","v5.4.38","v4.19.120","v4.14.178","v4.9.221","v4.4.221","v5.4.37","v4.19.119","v4.14.177","v4.9.220","v4.4.220","v5.4.36","v5.4.35","v4.19.118","v4.14.176","v4.9.219","v4.4.219","v5.4.34","v4.19.117","v5.4.33","v4.19.116","v5.4.32","v4.19.115","v5.4.31","v4.19.114","v4.14.175","v4.9.218","v4.4.218","v5.4.30","v4.4.217","v4.9.217","v4.14.174","v4.19.113","v5.4.29","v5.4.28","v5.4.27","v4.19.112","v5.4.26","v4.19.111","v4.14.173","v4.9.216","v4.4.216","v5.4.25","v4.19.110","v4.19.109","v5.4.24","v4.14.172","v4.19.108","v4.9.215","v4.4.215","v5.4.23","v4.19.107","v5.4.22","v4.19.106","v4.14.171","v4.9.214","v4.4.214","v5.4.21","v4.19.105","v5.4.20","v4.19.104","v5.4.19","v4.19.103","v4.14.170","v4.9.213","v4.4.213","v5.4.18","v4.19.102","v5.4.17","v4.19.101","v4.14.169","v4.9.212","v4.4.212","v4.19.100","v5.4.16","v5.4.15","v4.19.99","v4.14.168","v4.9.211","v4.4.211","v5.4","v4.19.98","v4.14.167","v5.4.14","v5.4.13","v4.19.97","v4.14.166","v4.9.210","v4.4.210","v5.4.12","v4.19.96","v4.14.165","v5.4.11","v4.19.95","v4.14.164","v4.9.209","v4.4.209","v5.4.10","v4.19.94","v4.14.163","v4.9.208","v4.4.208","v5.4.9","v5.4.8","v4.19.93","v4.14.162","v5.4.7","v4.19.92","v4.14.161","v4.9.207","v4.4.207","v5.4.6","v4.19.91","v4.14.160","v5.4.5","v4.19.90","v4.14.159","v4.9.206","v4.4.206","v5.4.4","v4.14.158","v4.19.89","v5.4.3","v4.19.88","v5.4.2","v5.4-rc1","v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