{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-31498", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-03-09T15:48:24.103Z", "datePublished": "2026-04-22T13:54:19.714Z", "dateUpdated": "2026-05-23T16:05:11.217Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-23T16:05:11.217Z" }, "descriptions": [ { "lang": "en", "value": "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." } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/bluetooth/l2cap_core.c" ], "versions": [ { "version": "96298f640104e4cd9a913a6e50b0b981829b94ff", "lessThan": "9760b83cfd24b38caee663f429011a0dd6064fa9", "status": "affected", "versionType": "git" }, { "version": "96298f640104e4cd9a913a6e50b0b981829b94ff", "lessThan": "de37e2655b7abc3f59254c6b72256840f39fc6d5", "status": "affected", "versionType": "git" }, { "version": "96298f640104e4cd9a913a6e50b0b981829b94ff", "lessThan": "e7aab23b7df89a3d754a5f0a7d2237548b328bd0", "status": "affected", "versionType": "git" }, { "version": "96298f640104e4cd9a913a6e50b0b981829b94ff", "lessThan": "52667c859fe33f70c2e711cb81bbd505d5eb8e75", "status": "affected", "versionType": "git" }, { "version": "96298f640104e4cd9a913a6e50b0b981829b94ff", "lessThan": "9a21a631ee034b1573dce14b572a24943dbfd7ae", "status": "affected", "versionType": "git" }, { "version": "96298f640104e4cd9a913a6e50b0b981829b94ff", "lessThan": "900e4db5385ec2cacd372345a80ab9c8e105b3a3", "status": "affected", "versionType": "git" }, { "version": "96298f640104e4cd9a913a6e50b0b981829b94ff", "lessThan": "042e2cd4bb11e5313b19b87593616524949e4c52", "status": "affected", "versionType": "git" }, { "version": "96298f640104e4cd9a913a6e50b0b981829b94ff", "lessThan": "25f420a0d4cfd61d3d23ec4b9c56d9f443d91377", "status": "affected", "versionType": "git" }, { "version": "4ad03ff6f680681c5f78254e37c4c856fa953629", "status": "affected", "versionType": "git" }, { "version": "b7d0ca715c1008acd2fc018f02a56fed88f78b75", "status": "affected", "versionType": "git" }, { "version": "799263eb37a4f7f6d39334046929c3bc92452a7f", "status": "affected", "versionType": "git" }, { "version": "8828622fb9b4201eeb0870587052e3d834cfaf61", "status": "affected", "versionType": "git" }, { "version": "b432ea85ab8472763870dd0f2c186130dd36d68c", "status": "affected", "versionType": "git" }, { "version": "4.4.238", "lessThan": "4.5", "status": "affected", "versionType": "semver" }, { "version": "4.9.238", "lessThan": "4.10", "status": "affected", "versionType": "semver" }, { "version": "4.14.200", "lessThan": "4.15", "status": "affected", "versionType": "semver" }, { "version": "4.19.149", "lessThan": "4.20", "status": "affected", "versionType": "semver" }, { "version": "5.4.69", "lessThan": "5.5", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/bluetooth/l2cap_core.c" ], "versions": [ { "version": "5.7", "status": "affected" }, { "version": "0", "lessThan": "5.7", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.253", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.203", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.168", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.131", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.80", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.21", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.19.11", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "5.10.253" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "5.15.203" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "6.1.168" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "6.6.131" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "6.12.80" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "6.18.21" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "6.19.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "7.0" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.4.238" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9.238" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14.200" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19.149" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4.69" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/9760b83cfd24b38caee663f429011a0dd6064fa9" }, { "url": "https://git.kernel.org/stable/c/de37e2655b7abc3f59254c6b72256840f39fc6d5" }, { "url": "https://git.kernel.org/stable/c/e7aab23b7df89a3d754a5f0a7d2237548b328bd0" }, { "url": "https://git.kernel.org/stable/c/52667c859fe33f70c2e711cb81bbd505d5eb8e75" }, { "url": "https://git.kernel.org/stable/c/9a21a631ee034b1573dce14b572a24943dbfd7ae" }, { "url": "https://git.kernel.org/stable/c/900e4db5385ec2cacd372345a80ab9c8e105b3a3" }, { "url": "https://git.kernel.org/stable/c/042e2cd4bb11e5313b19b87593616524949e4c52" }, { "url": "https://git.kernel.org/stable/c/25f420a0d4cfd61d3d23ec4b9c56d9f443d91377" } ], "title": "Bluetooth: L2CAP: Fix ERTM re-init and zero pdu_len infinite loop", "x_generator": { "engine": "bippy-1.2.0" } } } }