{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-43062", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-01T14:12:55.981Z", "datePublished": "2026-05-05T15:17:27.830Z", "dateUpdated": "2026-08-05T12:25:40.332Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:25:40.332Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: Fix type confusion in l2cap_ecred_reconf_rsp()\n\nl2cap_ecred_reconf_rsp() casts the incoming data to struct\nl2cap_ecred_conn_rsp (the ECRED *connection* response, 8 bytes with\nresult at offset 6) instead of struct l2cap_ecred_reconf_rsp (2 bytes\nwith result at offset 0).\n\nThis causes two problems:\n\n - The sizeof(*rsp) length check requires 8 bytes instead of the\n correct 2, so valid L2CAP_ECRED_RECONF_RSP packets are rejected\n with -EPROTO.\n\n - rsp->result reads from offset 6 instead of offset 0, returning\n wrong data when the packet is large enough to pass the check.\n\nFix by using the correct type. Also pass the already byte-swapped\nresult variable to BT_DBG instead of the raw __le16 field." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L", "baseScore": 7.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:A - Bluetooth L2CAP is reachable only by a nearby Bluetooth LE peer over the local radio link, not over routed IP networks.\nAC:L - Once an LE L2CAP ECRED channel/reconfiguration exchange exists, the attacker controls the response length and bytes; no hard-to-win race or environmental condition is required to hit the misparse.\nPR:N - The inbound HCI ACL/L2CAP signaling receive path has no local privilege or authentication check before parsing the peer's ECRED reconfiguration response.\nUI:N - No victim user action is required for packet processing beyond the system participating in a Bluetooth LE L2CAP session.\nS:U - The impact remains within the kernel/Bluetooth stack security authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:N - The wrong struct makes the kernel read the result from attacker-controlled packet bytes at offset 6 after an 8-byte length check, so this commit does not expose kernel memory.\nI:H - The bug is a kernel protocol-parser type confusion that lets an adjacent peer drive incorrect ECRED reconfiguration state and channel teardown based on the wrong field; per the supplied guidance, type confusion is scored High for integrity.\nA:L - The practical availability impact is disruption or failure of ECRED reconfiguration/channel state, not a demonstrated kernel panic, hang, or whole-system crash from this fix." } ] } ], "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": "15f02b91056253e8cdc592888f431da0731337b8", "lessThan": "21d3ba696918d6373233aac0b9d51fcabdedddc0", "status": "affected", "versionType": "git" }, { "version": "15f02b91056253e8cdc592888f431da0731337b8", "lessThan": "3b94e62caa1dc1198d0d55d97bd710da1dee15d7", "status": "affected", "versionType": "git" }, { "version": "15f02b91056253e8cdc592888f431da0731337b8", "lessThan": "111f74547eee8cfedfb854284e80f35c8a491186", "status": "affected", "versionType": "git" }, { "version": "15f02b91056253e8cdc592888f431da0731337b8", "lessThan": "dd3b221e21079ade8263fbb7176f3d55ad75d3b6", "status": "affected", "versionType": "git" }, { "version": "15f02b91056253e8cdc592888f431da0731337b8", "lessThan": "d90150c72d2e6a8a3079e88755dafcfbe91c746d", "status": "affected", "versionType": "git" }, { "version": "15f02b91056253e8cdc592888f431da0731337b8", "lessThan": "5a1ea296f8589ce8f1e3141b2b123b34ad010e19", "status": "affected", "versionType": "git" }, { "version": "15f02b91056253e8cdc592888f431da0731337b8", "lessThan": "f110b8f58b254bf997cec1bd60701b7798e9bb82", "status": "affected", "versionType": "git" }, { "version": "15f02b91056253e8cdc592888f431da0731337b8", "lessThan": "15145675690cab2de1056e7ed68e59cbd0452529", "status": "affected", "versionType": "git" } ] }, { "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": "6.1.167", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.130", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.78", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.20", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.19.10", "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": "6.1.167" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "6.6.130" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "6.12.78" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "6.18.20" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "6.19.10" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "7.0" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/21d3ba696918d6373233aac0b9d51fcabdedddc0" }, { "url": "https://git.kernel.org/stable/c/3b94e62caa1dc1198d0d55d97bd710da1dee15d7" }, { "url": "https://git.kernel.org/stable/c/111f74547eee8cfedfb854284e80f35c8a491186" }, { "url": "https://git.kernel.org/stable/c/dd3b221e21079ade8263fbb7176f3d55ad75d3b6" }, { "url": "https://git.kernel.org/stable/c/d90150c72d2e6a8a3079e88755dafcfbe91c746d" }, { "url": "https://git.kernel.org/stable/c/5a1ea296f8589ce8f1e3141b2b123b34ad010e19" }, { "url": "https://git.kernel.org/stable/c/f110b8f58b254bf997cec1bd60701b7798e9bb82" }, { "url": "https://git.kernel.org/stable/c/15145675690cab2de1056e7ed68e59cbd0452529" } ], "title": "Bluetooth: L2CAP: Fix type confusion in l2cap_ecred_reconf_rsp()", "x_generator": { "engine": "bippy-1.2.0" } } } }