{"affected":[{"defaultStatus":"unaffected","product":"Linux","source":"CNA: Linux","vendor":"Linux","versions":[{"lessThan":"9760b83cfd24b38caee663f429011a0dd6064fa9","status":"affected","version":"96298f640104e4cd9a913a6e50b0b981829b94ff","versionType":"git"},{"lessThan":"de37e2655b7abc3f59254c6b72256840f39fc6d5","status":"affected","version":"96298f640104e4cd9a913a6e50b0b981829b94ff","versionType":"git"},{"lessThan":"e7aab23b7df89a3d754a5f0a7d2237548b328bd0","status":"affected","version":"96298f640104e4cd9a913a6e50b0b981829b94ff","versionType":"git"},{"lessThan":"52667c859fe33f70c2e711cb81bbd505d5eb8e75","status":"affected","version":"96298f640104e4cd9a913a6e50b0b981829b94ff","versionType":"git"},{"lessThan":"9a21a631ee034b1573dce14b572a24943dbfd7ae","status":"affected","version":"96298f640104e4cd9a913a6e50b0b981829b94ff","versionType":"git"},{"lessThan":"900e4db5385ec2cacd372345a80ab9c8e105b3a3","status":"affected","version":"96298f640104e4cd9a913a6e50b0b981829b94ff","versionType":"git"},{"lessThan":"042e2cd4bb11e5313b19b87593616524949e4c52","status":"affected","version":"96298f640104e4cd9a913a6e50b0b981829b94ff","versionType":"git"},{"lessThan":"25f420a0d4cfd61d3d23ec4b9c56d9f443d91377","status":"affected","version":"96298f640104e4cd9a913a6e50b0b981829b94ff","versionType":"git"},{"status":"affected","version":"4ad03ff6f680681c5f78254e37c4c856fa953629","versionType":"git"},{"status":"affected","version":"b7d0ca715c1008acd2fc018f02a56fed88f78b75","versionType":"git"},{"status":"affected","version":"799263eb37a4f7f6d39334046929c3bc92452a7f","versionType":"git"},{"status":"affected","version":"8828622fb9b4201eeb0870587052e3d834cfaf61","versionType":"git"},{"status":"affected","version":"b432ea85ab8472763870dd0f2c186130dd36d68c","versionType":"git"},{"lessThan":"4.5","status":"affected","version":"4.4.238","versionType":"semver"},{"lessThan":"4.10","status":"affected","version":"4.9.238","versionType":"semver"},{"lessThan":"4.15","status":"affected","version":"4.14.200","versionType":"semver"},{"lessThan":"4.20","status":"affected","version":"4.19.149","versionType":"semver"},{"lessThan":"5.5","status":"affected","version":"5.4.69","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","source":"CNA: Linux","vendor":"Linux","versions":[{"status":"affected","version":"5.7"},{"lessThan":"5.7","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.253","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.203","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.168","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.131","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.80","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.21","versionType":"semver"},{"lessThanOrEqual":"6.19.*","status":"unaffected","version":"6.19.11","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.0","versionType":"original_commit_for_fix"}]}],"cveId":"CVE-2026-31498","cwes":[],"description":"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->sdu 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.","epss":{"date":"2026-11-05","percentile":0.02036,"score":0.00123},"exploits":[],"kev":null,"metrics":[],"modifiedAt":1793915103103,"publishedAt":1776866059714,"references":[{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/9760b83cfd24b38caee663f429011a0dd6064fa9"},{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/de37e2655b7abc3f59254c6b72256840f39fc6d5"},{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/e7aab23b7df89a3d754a5f0a7d2237548b328bd0"},{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/52667c859fe33f70c2e711cb81bbd505d5eb8e75"},{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/9a21a631ee034b1573dce14b572a24943dbfd7ae"},{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/900e4db5385ec2cacd372345a80ab9c8e105b3a3"},{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/042e2cd4bb11e5313b19b87593616524949e4c52"},{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/25f420a0d4cfd61d3d23ec4b9c56d9f443d91377"}],"remediation":[],"revision":"7043c573d47af3d0a68fe2b8f5ba1be0917838958474bd6f3794b53f89e92021","sources":[{"modifiedAt":1793915103103,"name":"CNA: Linux","retrievedAt":1793917069247,"url":"https://www.cve.org/CVERecord?id=CVE-2026-31498"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1793917073372,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-31498"}],"ssvc":{"assessedAt":1793914545390,"automatable":"no","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"Bluetooth: L2CAP: Fix ERTM re-init and zero pdu_len infinite loop","updatedAt":1793917073372}