{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-97508", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-24T16:01:01.151Z", "datePublished": "2026-09-24T16:04:58.740Z", "dateUpdated": "2026-10-03T10:59:06.059Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-03T10:59:06.059Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nthunderbolt: Set tb->root_switch to NULL when domain is stopped\n\nSimilarly what we do with the firmware connection manager. This makes\ntb_xdp_handle_request() return error to the remote host. However, we\nneed to make sure we keep the uuid alive so that we can reply until the\nwhole domain is released." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.5, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:A - XDomain discovery packets (TB_CFG_PKG_XDOMAIN_REQ) from a connected Thunderbolt/USB4 peer enter via tb_ctl_rx_callback → tb_domain_event_cb → tb_xdomain_handle_request → tb_xdp_schedule_request and are handled in tb_xdp_handle_request, which then reads tb->root_switch after software-CM tb_stop(). This is a local Thunderbolt fabric, not a routable IP protocol.\nAC:H - The UAF requires software-CM tb_stop() to have already run tb_switch_remove(tb->root_switch) without clearing the pointer. tb_stop() is only called from tb_domain_remove() in nhi_pci_remove (NHI unbind/PCI removal), which a Thunderbolt peer cannot induce; UUID_REQUEST and other XDomain messages only queue system_wq work that then races that teardown.\nPR:N - tb_domain_event_cb dispatches TB_CFG_PKG_XDOMAIN_REQ to tb_xdomain_handle_request whenever tb_is_xdomain_enabled() (default-on xdomain module param plus ACPI OSC), with no device authorization or local credentials; UUID_REQUEST is answered even when tb_xdomain_find_by_route_locked() finds no xdomain.\nUI:N - Once a Thunderbolt/USB4 link exists, the peer injects XDomain control packets itself and tb_xdp_handle_request runs with no mount, sysfs write, or authorization dialog. Domain teardown is an attacker-independent condition and is scored as AC:H rather than a required victim UI step.\nS:U - The dangling tb->root_switch and sw->uuid accesses corrupt host kernel heap state inside the Thunderbolt driver; this does not cross a VM, IOMMU, or sandbox boundary.\nC:H - After tb_stop() frees the host switch, tb_xdp_handle_request still holds tb->root_switch->uuid and tb_xdp_uuid_response() uuid_copy()s those 16 bytes into a UUID_RESPONSE sent back to the peer; UAF of struct tb_switch is also a kernel disclosure primitive.\nI:H - tb_xdomain_find_by_route() calls switch_find_xdomain(tb->root_switch) which walks the freed host switch via tb_switch_for_each_port, and later request handlers may operate on a reallocated tb_xdomain; that slab UAF can be sprayed into an arbitrary write or control-flow hijack.\nA:H - Dereferencing the freed root switch in tb_xdp_handle_request (uuid load) or switch_find_xdomain (port walk) oopses the system_wq kworker, crashing the host." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/thunderbolt/tb.c", "drivers/thunderbolt/xdomain.c" ], "versions": [ { "version": "d1ff70241a275133e1a0258b7c23588b122276c8", "lessThan": "d9a638e7bc87e0e6fe3a75517ac481e72fc0058c", "status": "affected", "versionType": "git" }, { "version": "d1ff70241a275133e1a0258b7c23588b122276c8", "lessThan": "66b0fe27e277713c2b9f3c452c76330ed0bd7eaf", "status": "affected", "versionType": "git" }, { "version": "d1ff70241a275133e1a0258b7c23588b122276c8", "lessThan": "54ad3415cc211ca0d64ae1bf3234d6eb5c6aedd0", "status": "affected", "versionType": "git" }, { "version": "d1ff70241a275133e1a0258b7c23588b122276c8", "lessThan": "83d1af5b1b6e6c96ffa633ca2c9a77f6f4c93efa", "status": "affected", "versionType": "git" }, { "version": "d1ff70241a275133e1a0258b7c23588b122276c8", "lessThan": "f06e9fbae78a51832211b4495a19412c7d49ecb4", "status": "affected", "versionType": "git" }, { "version": "d1ff70241a275133e1a0258b7c23588b122276c8", "lessThan": "99f019d2e9eb79adc485fef8aa8ada2cd0c843e9", "status": "affected", "versionType": "git" }, { "version": "d1ff70241a275133e1a0258b7c23588b122276c8", "lessThan": "e56249d8a68e712f3b60e1f3fdbb5b4fea146468", "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/tb.c", "drivers/thunderbolt/xdomain.c" ], "versions": [ { "version": "4.15", "status": "affected" }, { "version": "0", "lessThan": "4.15", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.271", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.222", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.189", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.158", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.111", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.53", "lessThanOrEqual": "6.18.*", "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": "4.15", "versionEndExcluding": "5.10.271" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "5.15.222" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "6.1.189" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "6.6.158" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "6.12.111" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "6.18.53" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/d9a638e7bc87e0e6fe3a75517ac481e72fc0058c" }, { "url": "https://git.kernel.org/stable/c/66b0fe27e277713c2b9f3c452c76330ed0bd7eaf" }, { "url": "https://git.kernel.org/stable/c/54ad3415cc211ca0d64ae1bf3234d6eb5c6aedd0" }, { "url": "https://git.kernel.org/stable/c/83d1af5b1b6e6c96ffa633ca2c9a77f6f4c93efa" }, { "url": "https://git.kernel.org/stable/c/f06e9fbae78a51832211b4495a19412c7d49ecb4" }, { "url": "https://git.kernel.org/stable/c/99f019d2e9eb79adc485fef8aa8ada2cd0c843e9" }, { "url": "https://git.kernel.org/stable/c/e56249d8a68e712f3b60e1f3fdbb5b4fea146468" } ], "title": "thunderbolt: Set tb->root_switch to NULL when domain is stopped", "x_generator": { "engine": "bippy-1.2.0" } } } }