236 lines
12 KiB
JSON
236 lines
12 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-2026-74534",
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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": "2026-08-15T12:27:47.831Z",
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"dateUpdated": "2026-10-23T08:20:16.546Z"
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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": "2026-10-23T08:20:16.546Z"
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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: ISO: fix refcounting of iso_conn\n\niso_conn_del() and iso_chan_del() have a race that results to double-put\nof iso_conn:\n\n [Task hdev->workqueue] [Task 2]\n iso_conn_del iso_chan_del\n iso_conn_hold_unless_zero iso_conn_lock\n iso_conn_lock conn->sk = NULL\n iso_conn_unlock\n sk = iso_sock_hold(conn) <---------´\n if (!sk) iso_conn_put iso_conn_put\n iso_conn_put /* UAF */\n\nThe extra put for !sk in iso_conn_del() is currently required since\nfailing iso_chan_add() may leave iso_conn not associated with any sk.\n\nFix by having iso_pi(sk)->conn own refcount when non-NULL, so\niso_conn_del does not need to put it. Adjust the iso_conn_add()\nrefcounting so that conn is put if it does not get associated with an\nsk."
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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 bug is in Bluetooth ISO connection teardown; a remote LE Audio/CIS/BIS peer in range can trigger iso_conn_del via HCI disconnect events (iso_disconn_cfm) that race with concurrent socket teardown.\nAC:L - The double kref_put race is between iso_conn_del and iso_chan_del; an adjacent attacker controls disconnect timing and can repeatedly connect/disconnect to race automatic kernel and Bluetooth daemon socket cleanup.\nPR:N - No local UNIX privileges are required; a malicious or compromised adjacent Bluetooth ISO peer with an established connection can initiate the disconnect leg without root, capabilities, or user-namespace admin rights.\nUI:N - No explicit victim action is needed beyond an active ISO session; remote disconnect triggers automatic HCI teardown and stack socket close that can race iso_chan_del without the user manually closing applications.\nS:U - The vulnerability corrupts kernel heap lifetime of iso_conn objects within the Bluetooth subsystem and does not cross VM, hypervisor, or IOMMU security boundaries.\nC:H - Premature kfree of iso_conn from the refcount race is a use-after-free that can expose kernel heap contents and be leveraged for arbitrary kernel memory disclosure.\nI:H - UAF on iso_conn enables heap grooming and corrupted pointer dereferences that can be leveraged for arbitrary kernel memory writes or privilege-escalating code execution.\nA:H - The double iso_conn_put can free iso_conn while still referenced, causing kernel oops/panic or reliably exploitable instability during ISO connection teardown."
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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/iso.c"
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],
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"versions": [
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{
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"version": "a58d0f5dac322e16cc75334d000666512341bde5",
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"lessThan": "42c8bd6ac81e21200bb90f1eaf43d19352eec6d7",
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"status": "affected",
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"status": "affected",
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},
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{
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"version": "6.12.2",
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"lessThan": "6.12.113",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.11.11",
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"lessThan": "6.12",
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"status": "affected",
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{
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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/iso.c"
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],
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{
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"version": "6.13",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThanOrEqual": "6.12.*",
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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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"operator": "OR",
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"versionStartIncluding": "6.12.2",
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/42c8bd6ac81e21200bb90f1eaf43d19352eec6d7"
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},
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{
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"url": "https://git.kernel.org/stable/c/3b921533e8aa95b77aadcf31737595578e735f3c"
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},
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{
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"url": "https://git.kernel.org/stable/c/8208b4939afb0a1977fffe902c3ca42fe0f3baaa"
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{
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"url": "https://git.kernel.org/stable/c/fdfde532ab1caa165fcd8985001157ac8b4db365"
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}
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],
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"title": "Bluetooth: ISO: fix refcounting of iso_conn",
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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-2026-74534",
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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": "2026-10-16T18:59:26.294931Z"
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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": "2026-10-16T19:05:53.833Z"
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}
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}
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]
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}
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} |