298 lines
16 KiB
JSON
298 lines
16 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-2026-74540",
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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": "2026-08-15T05:44:03.913Z",
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"datePublished": "2026-08-15T12:27:51.522Z",
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"dateUpdated": "2026-10-16T19:05:54.604Z"
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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": "2026-08-19T16:38:32.306Z"
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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 UAF in l2cap_le_connect_rsp\n\nl2cap_le_connect_rsp() obtains a channel via\n__l2cap_get_chan_by_ident() but neither holds a reference nor uses\nl2cap_chan_hold_unless_zero() before locking and operating on it.\nA concurrent l2cap_chan_del() triggered by a remote disconnect can\nfree the channel between the lookup and l2cap_chan_lock(), causing\na use-after-free.\n\nThe BR/EDR counterpart l2cap_connect_rsp() and the sibling handler\nl2cap_le_command_rej() already use l2cap_chan_hold_unless_zero()\nto safely hold a reference, but l2cap_le_connect_rsp() was left\nunprotected.\n\nFix by adding l2cap_chan_hold_unless_zero() after the ident lookup\nand l2cap_chan_put() on the exit path, consistent with other L2CAP\nresponse handlers."
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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:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 8.8,
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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 vulnerability is reached when the kernel processes an incoming L2CAP LE Connect Response over an established Bluetooth LE ACL link (HCI ACL receive → l2cap_recv_acldata → l2cap_le_sig_channel → l2cap_le_connect_rsp), requiring radio proximity rather than routable Internet access.\nAC:L - The remote Bluetooth peer controls both sides of the race by sending L2CAP_LE_CONN_RSP while concurrently triggering channel teardown via L2CAP DISCONN_REQ or HCI disconnect, freeing the channel between __l2cap_get_chan_by_ident() and l2cap_chan_lock() without attacker-uncontrollable timing.\nPR:N - No local privileges on the victim are required; exploitation needs only a nearby attacker with an established LE Bluetooth connection sending crafted L2CAP signaling packets, with no root, CAP_NET_ADMIN, or user-namespace capability on the target host.\nUI:N - On phones, wearables, automotive, and IoT deployments, paired or background Bluetooth clients routinely auto-initiate L2CAP credit-based connections without per-attack user confirmation once an LE link is up, enabling trigger of the pending outgoing connect path.\nS:U - Impact is confined to kernel memory and privileges on the Bluetooth-connected host; there is no VM guest-to-host escape, sandbox breakout, or IOMMU/DMA boundary crossing, so security scope remains unchanged per kernel CVSS guidance.\nC:H - Use-after-free of heap-allocated struct l2cap_chan allows attacker-controlled reuse of freed slab memory, enabling disclosure of kernel heap contents and pointers through corrupted channel fields accessed after premature free.\nI:H - The UAF window writes channel state (ident, dcid, mtu, credits) and invokes chan->ops function pointers (ready, teardown) on freed memory, enabling heap spraying and control-flow hijack for arbitrary kernel code execution.\nA:H - Operating on a freed l2cap_chan can immediately kernel-oops or panic from corrupt mutex/state during lock/unlock and callback dispatch; UAF in softirq L2CAP processing inherently threatens full system availability."
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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": "f1496dee9cbde2a62821f4441dadb0d3360f60c3",
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"lessThan": "15d6c2367217a6a20b1abae9f38ded716bf620f1",
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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": "f1496dee9cbde2a62821f4441dadb0d3360f60c3",
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"lessThan": "1818180fe12d6cec7a437bc59cde8efdf6b10250",
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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": "f1496dee9cbde2a62821f4441dadb0d3360f60c3",
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"lessThan": "8325eafb38c3dee5af329266393763693d17381b",
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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": "f1496dee9cbde2a62821f4441dadb0d3360f60c3",
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"lessThan": "fd4c1e301bdec60a40728ea37de531cbccda501a",
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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": "f1496dee9cbde2a62821f4441dadb0d3360f60c3",
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"lessThan": "522b730c62c53a1981604fd73524697fd347830d",
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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": "f1496dee9cbde2a62821f4441dadb0d3360f60c3",
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"lessThan": "58e3c5289ad230a7e24ae4b0c7b43f5ee6e32136",
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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": "f1496dee9cbde2a62821f4441dadb0d3360f60c3",
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"lessThan": "09f447accc2570751e7d17f0dc0788b40d3edade",
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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": "f1496dee9cbde2a62821f4441dadb0d3360f60c3",
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"lessThan": "c4740e7f23ff9a8210198d8b4703259e21b9f69d",
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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": "3.14",
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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": "3.14",
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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": "5.10.265",
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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": "5.15.216",
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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": "6.1.183",
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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": "6.6.151",
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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": "6.12.103",
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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": "6.18.44",
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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": "7.1.8",
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"lessThanOrEqual": "7.1.*",
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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": "7.2",
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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": "3.14",
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"versionEndExcluding": "5.10.265"
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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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]
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/15d6c2367217a6a20b1abae9f38ded716bf620f1"
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},
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{
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"url": "https://git.kernel.org/stable/c/1818180fe12d6cec7a437bc59cde8efdf6b10250"
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},
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{
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"url": "https://git.kernel.org/stable/c/8325eafb38c3dee5af329266393763693d17381b"
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},
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{
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"url": "https://git.kernel.org/stable/c/fd4c1e301bdec60a40728ea37de531cbccda501a"
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},
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{
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"url": "https://git.kernel.org/stable/c/522b730c62c53a1981604fd73524697fd347830d"
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},
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{
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"url": "https://git.kernel.org/stable/c/58e3c5289ad230a7e24ae4b0c7b43f5ee6e32136"
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},
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{
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"url": "https://git.kernel.org/stable/c/09f447accc2570751e7d17f0dc0788b40d3edade"
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},
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{
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"url": "https://git.kernel.org/stable/c/c4740e7f23ff9a8210198d8b4703259e21b9f69d"
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}
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],
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"title": "Bluetooth: L2CAP: fix UAF in l2cap_le_connect_rsp",
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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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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2026-74540",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "total"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-16T18:59:42.755795Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-16T19:05:54.604Z"
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}
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}
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]
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}
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} |