{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-74575", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.917Z", "datePublished": "2026-08-15T12:28:13.187Z", "dateUpdated": "2026-08-23T12:47:35.374Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-23T12:47:35.374Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nthunderbolt: Prevent XDomain delayed work use-after-free on disconnect\n\ntb_xdp_handle_request() runs on system_wq and queues\nxd->state_work via queue_delayed_work() in three request handlers:\nPROPERTIES_CHANGED_REQUEST, UUID_REQUEST (via start_handshake),\nand LINK_STATE_CHANGE_REQUEST. Similarly, update_xdomain() queues\nxd->properties_changed_work when local properties change.\n\nConcurrently, tb_xdomain_remove() calls stop_handshake() which does\ncancel_delayed_work_sync() on both delayed works. Later,\ntb_xdomain_unregister() calls device_unregister() which eventually\nfrees the xdomain. Since commit 559c1e1e0134 (\"thunderbolt: Run\ntb_xdp_handle_request() in system workqueue\") moved the request\nhandler off tb->wq, the handler and the remove path are no longer\nserialized. If queue_delayed_work() executes after\ncancel_delayed_work_sync() but before the xdomain is freed, the\ndelayed work fires on a freed object.\n\nAdd xd->removing that tb_xdomain_remove() sets under xd->lock\nbefore calling stop_handshake(). Each external queue site holds\nthe same lock and checks removing before calling\nqueue_delayed_work(). This provides the mutual exclusion needed:\neither the queue site acquires the lock first and queues work that\nthe subsequent cancel will see, or the remove path acquires the\nlock first and the queue site observes removing == true and skips\nthe queue." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:A - XDomain discovery packets reach the kernel over the Thunderbolt/USB4 control channel from a connected peer (adjacent host, dock, or inline device) on the shared physical link; no remote IP/network service is involved, but the attacker need not touch the victim chassis if they control the far end of an established TB connection.\nAC:L - The bug is a race between system_wq request handling and disconnect teardown; the peer attacker controls both sides by sending PROPERTIES_CHANGED, UUID, or LINK_STATE_CHANGE requests while forcing unplug/disconnect and can retry timing until delayed work is queued after cancel_delayed_work_sync().\nPR:N - No local account, capability, or root on the victim is required; any malicious or compromised Thunderbolt XDomain peer that can exchange discovery control-plane packets can trigger the vulnerable queue_delayed_work() paths without OS authentication.\nUI:N - During an active XDomain session the peer can send the triggering requests and force link teardown without any further victim action at exploit time; no additional mount, login, or sysfs operation is needed beyond the already-established Thunderbolt link.\nS:U - Impact is kernel heap use-after-free and memory corruption within kernel context; it does not directly cross VM, container, or IOMMU boundaries, though successful exploitation can yield standard local privilege escalation.\nC:H - Use-after-free on struct tb_xdomain lets attacker-influenced delayed work read freed kernel memory, enabling arbitrary kernel information disclosure and kernel pointer leaks that support further exploitation of the corruption primitive.\nI:H - Delayed work on the freed xdomain executes handshake state transitions, property/link updates, and hardware operations on attacker-reclaimed memory, enabling heap grooming and control-flow hijack for arbitrary kernel write/code execution.\nA:H - Accessing freed tb_xdomain via state_work or properties_changed_work causes kernel oops/panic or hang during disconnect, and a peer can repeat disconnect/request storms to deny Thunderbolt/XDomain services." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/thunderbolt/xdomain.c", "include/linux/thunderbolt.h" ], "versions": [ { "version": "559c1e1e013437bf190469efbcbd8bc803285853", "lessThan": "d4fa0d544c04dea636bf821ff5582cd7d63e2c34", "status": "affected", "versionType": "git" }, { "version": "559c1e1e013437bf190469efbcbd8bc803285853", "lessThan": "cfbd2dba3d862c9be8c92bea2a357d9ed828a54a", "status": "affected", "versionType": "git" }, { "version": "559c1e1e013437bf190469efbcbd8bc803285853", "lessThan": "dc11d5118f9da6ea28487ffe055de5a0d0734125", "status": "affected", "versionType": "git" }, { "version": "559c1e1e013437bf190469efbcbd8bc803285853", "lessThan": "91b40862a02000f490b63f1d315be3ee31e83871", "status": "affected", "versionType": "git" }, { "version": "559c1e1e013437bf190469efbcbd8bc803285853", "lessThan": "33c0ee18cf8665c974b00f4e0ba769fbc07efe10", "status": "affected", "versionType": "git" }, { "version": "559c1e1e013437bf190469efbcbd8bc803285853", "lessThan": "54a62153c765cd24239cde1f2633f2a2fd005368", "status": "affected", "versionType": "git" }, { "version": "559c1e1e013437bf190469efbcbd8bc803285853", "lessThan": "2aa2cde2cc79a79d8ea4a15be9f4a67fc528ae91", "status": "affected", "versionType": "git" }, { "version": "559c1e1e013437bf190469efbcbd8bc803285853", "lessThan": "2c5d2d3c3f70cde2565d7b279b544893a2035842", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/thunderbolt/xdomain.c", "include/linux/thunderbolt.h" ], "versions": [ { "version": "5.2", "status": "affected" }, { "version": "0", "lessThan": "5.2", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.266", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.217", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.184", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.151", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.103", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.44", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.8", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "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": "5.2", "versionEndExcluding": "5.10.266" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "5.15.217" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "6.1.184" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "6.6.151" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "6.12.103" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "6.18.44" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "7.1.8" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/d4fa0d544c04dea636bf821ff5582cd7d63e2c34" }, { "url": "https://git.kernel.org/stable/c/cfbd2dba3d862c9be8c92bea2a357d9ed828a54a" }, { "url": "https://git.kernel.org/stable/c/dc11d5118f9da6ea28487ffe055de5a0d0734125" }, { "url": "https://git.kernel.org/stable/c/91b40862a02000f490b63f1d315be3ee31e83871" }, { "url": "https://git.kernel.org/stable/c/33c0ee18cf8665c974b00f4e0ba769fbc07efe10" }, { "url": "https://git.kernel.org/stable/c/54a62153c765cd24239cde1f2633f2a2fd005368" }, { "url": "https://git.kernel.org/stable/c/2aa2cde2cc79a79d8ea4a15be9f4a67fc528ae91" }, { "url": "https://git.kernel.org/stable/c/2c5d2d3c3f70cde2565d7b279b544893a2035842" } ], "title": "thunderbolt: Prevent XDomain delayed work use-after-free on disconnect", "x_generator": { "engine": "bippy-1.2.0" } } } }