{"id":"CVE-2026-97509","state":"PUBLISHED","title":"thunderbolt: Keep XDomain reference during the lifetime of a service","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nthunderbolt: Keep XDomain reference during the lifetime of a service\n\nThis is needed because we release the service ID in tb_service_release()\nand the ID array is owned by the parent XDomain.","publishedAt":"2026-09-24T16:05:04.487Z","updatedAt":"2026-10-03T10:59:07.153Z","severity":{"score":8.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"d1ff70241a275133e1a0258b7c23588b122276c8","status":"affected","lessThan":"a4567e5380e4e46d0ea9a28d2d675e5c6f013d54","versionType":"git"},{"version":"d1ff70241a275133e1a0258b7c23588b122276c8","status":"affected","lessThan":"daeaa6c7211d03ed061b0dd22a875fad9372b090","versionType":"git"},{"version":"d1ff70241a275133e1a0258b7c23588b122276c8","status":"affected","lessThan":"cca72fe513f3d6b1279fe83483f8a8990adbe0c6","versionType":"git"},{"version":"d1ff70241a275133e1a0258b7c23588b122276c8","status":"affected","lessThan":"57359bb31526c2f1bb0a7b9b69d8b8a6bd3f0e9f","versionType":"git"},{"version":"d1ff70241a275133e1a0258b7c23588b122276c8","status":"affected","lessThan":"8ab12d015884b8aa85ea7ed58c5a0bae4264fe60","versionType":"git"},{"version":"d1ff70241a275133e1a0258b7c23588b122276c8","status":"affected","lessThan":"ea60ae6233ca0fc0d414e9c11f0d86c63b303fc7","versionType":"git"},{"version":"d1ff70241a275133e1a0258b7c23588b122276c8","status":"affected","lessThan":"8b4060998637f06975fceee9b73845d8672d411e","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/thunderbolt/xdomain.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.15","versionType":"semver"},{"version":"5.10.266","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.217","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.111","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.53","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/thunderbolt/xdomain.c"]}],"references":["https://git.kernel.org/stable/c/a4567e5380e4e46d0ea9a28d2d675e5c6f013d54","https://git.kernel.org/stable/c/daeaa6c7211d03ed061b0dd22a875fad9372b090","https://git.kernel.org/stable/c/cca72fe513f3d6b1279fe83483f8a8990adbe0c6","https://git.kernel.org/stable/c/57359bb31526c2f1bb0a7b9b69d8b8a6bd3f0e9f","https://git.kernel.org/stable/c/8ab12d015884b8aa85ea7ed58c5a0bae4264fe60","https://git.kernel.org/stable/c/ea60ae6233ca0fc0d414e9c11f0d86c63b303fc7","https://git.kernel.org/stable/c/8b4060998637f06975fceee9b73845d8672d411e"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:43.249Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/97xxx/CVE-2026-97509.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-97509","state":"PUBLISHED","datePublished":"2026-09-24T16:05:04.487Z","dateUpdated":"2026-10-03T10:59:07.153Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-24T16:01:01.151Z"},"containers":{"cna":{"title":"thunderbolt: Keep XDomain reference during the lifetime of a service","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nthunderbolt: Keep XDomain reference during the lifetime of a service\n\nThis is needed because we release the service ID in tb_service_release()\nand the ID array is owned by the parent XDomain."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"d1ff70241a275133e1a0258b7c23588b122276c8","status":"affected","lessThan":"a4567e5380e4e46d0ea9a28d2d675e5c6f013d54","versionType":"git"},{"version":"d1ff70241a275133e1a0258b7c23588b122276c8","status":"affected","lessThan":"daeaa6c7211d03ed061b0dd22a875fad9372b090","versionType":"git"},{"version":"d1ff70241a275133e1a0258b7c23588b122276c8","status":"affected","lessThan":"cca72fe513f3d6b1279fe83483f8a8990adbe0c6","versionType":"git"},{"version":"d1ff70241a275133e1a0258b7c23588b122276c8","status":"affected","lessThan":"57359bb31526c2f1bb0a7b9b69d8b8a6bd3f0e9f","versionType":"git"},{"version":"d1ff70241a275133e1a0258b7c23588b122276c8","status":"affected","lessThan":"8ab12d015884b8aa85ea7ed58c5a0bae4264fe60","versionType":"git"},{"version":"d1ff70241a275133e1a0258b7c23588b122276c8","status":"affected","lessThan":"ea60ae6233ca0fc0d414e9c11f0d86c63b303fc7","versionType":"git"},{"version":"d1ff70241a275133e1a0258b7c23588b122276c8","status":"affected","lessThan":"8b4060998637f06975fceee9b73845d8672d411e","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/thunderbolt/xdomain.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.15","versionType":"semver"},{"version":"5.10.266","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.217","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.111","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.53","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/thunderbolt/xdomain.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/a4567e5380e4e46d0ea9a28d2d675e5c6f013d54"},{"url":"https://git.kernel.org/stable/c/daeaa6c7211d03ed061b0dd22a875fad9372b090"},{"url":"https://git.kernel.org/stable/c/cca72fe513f3d6b1279fe83483f8a8990adbe0c6"},{"url":"https://git.kernel.org/stable/c/57359bb31526c2f1bb0a7b9b69d8b8a6bd3f0e9f"},{"url":"https://git.kernel.org/stable/c/8ab12d015884b8aa85ea7ed58c5a0bae4264fe60"},{"url":"https://git.kernel.org/stable/c/ea60ae6233ca0fc0d414e9c11f0d86c63b303fc7"},{"url":"https://git.kernel.org/stable/c/8b4060998637f06975fceee9b73845d8672d411e"}],"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 - enumerate_services() runs from tb_xdomain_get_properties() after the peer's PROPERTIES_RESPONSE (tb_xdp_properties_request on the Thunderbolt/USB4 control channel) so tb_service children exist; the same peer's link-down hits tb_handle_hotplug() then tb_xdomain_unregister(). That is the TB fabric, not a routable IP protocol.\nAC:L - The peer controls both sides: property-block directories make enumerate_services() device_register() services without get_device(&xd->dev), then dropping the link runs tb_xdomain_unregister() → unregister_service() → device_del() put_device(parent) before tb_service_release() uses xd->service_ids. Advertise/unplug can be retried; no attacker-independent fault is required.\nPR:N - tb_domain_event_cb delivers TB_CFG_PKG_XDOMAIN_REQ/RESP to tb_xdomain_handle_request whenever tb_is_xdomain_enabled() (xdomain module_param defaults true, plus ACPI OSC). UUID/property handshake and enumerate_services() run with no device authorization or local credentials on the victim.\nUI:N - tb_xdomain_add() starts the handshake by itself; enumerate_services() and later tb_xdomain_unregister() (tb_domain_unregister_unplugged_xdomains after unplug) run from the connection-manager hotplug path with no victim mount, sysfs write, or authorization dialog.\nS:U - tb_service_release() ida_free()s the already-freed tb_xdomain.service_ids IDA in the host kernel; that does not cross a VM, IOMMU, or sandbox boundary.\nC:H - After tb_xdomain_release() kfree()s the XDomain, tb_service_release() calls tb_service_parent() (reads svc->dev.parent->type) and ida_free(&xd->service_ids). That slab UAF of struct tb_xdomain can be reclaimed for an arbitrary kernel read.\nI:H - ida_free() writes the IDA/XArray embedded in the already-freed tb_xdomain; a sprayed replacement object is a kernel write and control-flow hijack primitive, as in other parent-IDA lifetime UAFs.\nA:H - tb_service_release() on a kfree'd tb_xdomain (parent type-check or ida_free of destroyed service_ids) oopses or panics the host; the peer can repeat advertise-and-unplug cycles to take Thunderbolt down."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-03T10:59:07.153Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.15","versionEndExcluding":"5.10.266"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.15","versionEndExcluding":"5.15.217"},{"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"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}