264 lines
14 KiB
JSON
264 lines
14 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-98108",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-09-25T10:25:14.316Z",
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"datePublished": "2026-09-25T10:35:56.935Z",
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"dateUpdated": "2026-10-19T09:14:00.739Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-10-19T09:14:00.739Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: fix chan mode for LE_CONN_REQ + EXT_FLOWCTL pchan\n\nl2cap_new_connection() sets default value of channel mode to match the\nparent channel. l2cap_le_connect_req() left this at the default, and\ncreated L2CAP_MODE_EXT_FLOWCTL channels if listening pchan has that\nmode. This causes FLAG_DEFER_SETUP channels to reply to\nL2CAP_LE_CONN_REQ with L2CAP_ECRED_CONN_RSP, which is incorrect.\n\nIt can also result to stack OOB write (of l2cap_alloc_cid determined\nvalues) in l2cap_ecred_rsp_defer(), as l2cap_le_connect_req() does not\nlimit maximum number of deferred channels or check for duplicate ident.\n\nFix by setting chan->mode correctly in l2cap_le_connect_req().\n\nAlso check channel mode in l2cap_ecred_rsp_defer(), and do WARN_ON_ONCE\ninstead of OOB write to make it less brittle."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.5,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:A - The malformed input is a series of L2CAP_LE_CONN_REQ signalling commands, all using the same ident, sent over a BLE link to l2cap_le_connect_req(). The attacker must be within Bluetooth radio range, so the vector is Adjacent.\nAC:H - The OOB write only happens if the target runs an LE listener in BT_MODE_EXT_FLOWCTL with DEFER_SETUP, whose children inherit EXT_FLOWCTL through l2cap_new_connection(). The attacker cannot create that listener. Once it exists, the attacker controls how many LE_CONN_REQs share one ident, and the service's own recvmsg() triggers the write.\nPR:N - l2cap_le_connect_req() only checks the listener's sec_level through smp_sufficient_security(). An LE listener defaults to BT_SECURITY_LOW, so an unpaired peer can open the channels, and Just Works pairing is available otherwise.\nUI:N - No human action is needed. The listening service's normal accept/recvmsg on a deferred child calls l2cap_sock_recvmsg(), which then calls __l2cap_ecred_conn_rsp_defer().\nS:U - The memory corruption stays within the kernel's own security authority. No VM or hardware isolation boundary is crossed.\nC:H - l2cap_ecred_rsp_defer() writes CIDs past the 5-entry scid[] into the adjacent 'count' field, which then steers later writes to attacker-influenced offsets on the kernel stack. Corruption of this kind can be leveraged for disclosure.\nI:H - This is an out-of-bounds write on the kernel stack in __l2cap_ecred_conn_rsp_defer(). The written values are l2cap_alloc_cid() CIDs whose count and order the attacker influences, and the write can reach the saved frame state.\nA:H - Stack corruption in __l2cap_ecred_conn_rsp_defer() causes a stack-protector panic or an oops, crashing the kernel, and the peer can repeat it."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/bluetooth/l2cap_core.c"
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],
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"versions": [
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{
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"version": "15f02b91056253e8cdc592888f431da0731337b8",
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"lessThan": "ad0f44a3f1f688558ed876a0702bc2c82b0df689",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "15f02b91056253e8cdc592888f431da0731337b8",
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"lessThan": "564ae0e05e598aa895b9dbd18cb7d6eb64752869",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "15f02b91056253e8cdc592888f431da0731337b8",
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"lessThan": "aab17938998b29e75c3324763411aef3e300fc67",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "15f02b91056253e8cdc592888f431da0731337b8",
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"lessThan": "0e1fc7cab95ad958e55d70a5dfaaea687c9c639f",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "15f02b91056253e8cdc592888f431da0731337b8",
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"lessThan": "1074bcc57f741223f9fa82ce6afe5c3d783e4d10",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "15f02b91056253e8cdc592888f431da0731337b8",
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"lessThan": "5d5a625cbc854d4c4f68e4b16fcf6e682d9a9ed1",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "15f02b91056253e8cdc592888f431da0731337b8",
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"lessThan": "6cb79e6499228cfdbd4b3301371ce74d01cd2f80",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "15f02b91056253e8cdc592888f431da0731337b8",
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"lessThan": "4ef05db5b08b176a551b4a6287372045998806b0",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/bluetooth/l2cap_core.c"
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],
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"versions": [
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{
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"version": "5.7",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "5.7",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.10.271",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.222",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.189",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.158",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.111",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.53",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2.7",
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"lessThanOrEqual": "7.2.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.3",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.7",
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"versionEndExcluding": "5.10.271"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.7",
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"versionEndExcluding": "5.15.222"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.7",
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"versionEndExcluding": "6.1.189"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.7",
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"versionEndExcluding": "6.6.158"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.7",
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"versionEndExcluding": "6.12.111"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.7",
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"versionEndExcluding": "6.18.53"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.7",
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"versionEndExcluding": "7.2.7"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.7",
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"versionEndExcluding": "7.3"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/ad0f44a3f1f688558ed876a0702bc2c82b0df689"
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},
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{
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"url": "https://git.kernel.org/stable/c/564ae0e05e598aa895b9dbd18cb7d6eb64752869"
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},
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{
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"url": "https://git.kernel.org/stable/c/aab17938998b29e75c3324763411aef3e300fc67"
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},
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{
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"url": "https://git.kernel.org/stable/c/0e1fc7cab95ad958e55d70a5dfaaea687c9c639f"
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},
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{
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"url": "https://git.kernel.org/stable/c/1074bcc57f741223f9fa82ce6afe5c3d783e4d10"
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},
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{
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"url": "https://git.kernel.org/stable/c/5d5a625cbc854d4c4f68e4b16fcf6e682d9a9ed1"
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},
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{
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"url": "https://git.kernel.org/stable/c/6cb79e6499228cfdbd4b3301371ce74d01cd2f80"
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},
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{
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"url": "https://git.kernel.org/stable/c/4ef05db5b08b176a551b4a6287372045998806b0"
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}
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],
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"title": "Bluetooth: L2CAP: fix chan mode for LE_CONN_REQ + EXT_FLOWCTL pchan",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |