{"id":"CVE-2026-98692","state":"PUBLISHED","title":"thunderbolt: Make the DP tunnel activation callback mandatory","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nthunderbolt: Make the DP tunnel activation callback mandatory\n\ntb_tunnel_alloc_dp() takes an optional callback which is run from\ndprx_work once the DPRX capabilities read has completed. Without that\ncallback tb_dp_dprx_start() reads the capabilities synchronously and\nnever queues the work. It however always takes a tunnel reference which\nis only dropped by dprx_work itself or by tb_dp_dprx_stop() when\ncancel_delayed_work() actually canceled that work. That reference is\nthus leaked for every tunnel without a callback.\n\nThe only tunnels without one are those from tb_tunnel_discover_dp(),\nwhich are activated again when restoring from hibernation.\nPass the callback to tb_tunnel_discover_dp() as well and drop the\nsynchronous path such that the DPRX capabilities are always read from\ndprx_work. Hibernation restore then also no longer blocks for up to 12\nseconds while waiting for that read to complete.\n\nAlso fix up the KUnit tests.","publishedAt":"2026-10-18T15:46:16.794Z","updatedAt":"2026-10-19T09:24:02.145Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"d6d458d42e1e1544a18f37f1d5c840e00d5261b9","status":"affected","lessThan":"47d60ea801fc333a10c576691eca2e7840b02d3d","versionType":"git"},{"version":"d6d458d42e1e1544a18f37f1d5c840e00d5261b9","status":"affected","lessThan":"12f5d8b85a66a0ac08d082517d92ce136f8c0d42","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/thunderbolt/tb.c","drivers/thunderbolt/test.c","drivers/thunderbolt/tunnel.c","drivers/thunderbolt/tunnel.h"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.14","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.14","versionType":"semver"},{"version":"7.2.10","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/thunderbolt/tb.c","drivers/thunderbolt/test.c","drivers/thunderbolt/tunnel.c","drivers/thunderbolt/tunnel.h"]}],"references":["https://git.kernel.org/stable/c/47d60ea801fc333a10c576691eca2e7840b02d3d","https://git.kernel.org/stable/c/12f5d8b85a66a0ac08d082517d92ce136f8c0d42"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:43.249Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/98xxx/CVE-2026-98692.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-98692","state":"PUBLISHED","datePublished":"2026-10-18T15:46:16.794Z","dateUpdated":"2026-10-19T09:24:02.145Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:25:14.364Z"},"containers":{"cna":{"title":"thunderbolt: Make the DP tunnel activation callback mandatory","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nthunderbolt: Make the DP tunnel activation callback mandatory\n\ntb_tunnel_alloc_dp() takes an optional callback which is run from\ndprx_work once the DPRX capabilities read has completed. Without that\ncallback tb_dp_dprx_start() reads the capabilities synchronously and\nnever queues the work. It however always takes a tunnel reference which\nis only dropped by dprx_work itself or by tb_dp_dprx_stop() when\ncancel_delayed_work() actually canceled that work. That reference is\nthus leaked for every tunnel without a callback.\n\nThe only tunnels without one are those from tb_tunnel_discover_dp(),\nwhich are activated again when restoring from hibernation.\nPass the callback to tb_tunnel_discover_dp() as well and drop the\nsynchronous path such that the DPRX capabilities are always read from\ndprx_work. Hibernation restore then also no longer blocks for up to 12\nseconds while waiting for that read to complete.\n\nAlso fix up the KUnit tests."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"d6d458d42e1e1544a18f37f1d5c840e00d5261b9","status":"affected","lessThan":"47d60ea801fc333a10c576691eca2e7840b02d3d","versionType":"git"},{"version":"d6d458d42e1e1544a18f37f1d5c840e00d5261b9","status":"affected","lessThan":"12f5d8b85a66a0ac08d082517d92ce136f8c0d42","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/thunderbolt/tb.c","drivers/thunderbolt/test.c","drivers/thunderbolt/tunnel.c","drivers/thunderbolt/tunnel.h"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.14","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.14","versionType":"semver"},{"version":"7.2.10","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/thunderbolt/tb.c","drivers/thunderbolt/test.c","drivers/thunderbolt/tunnel.c","drivers/thunderbolt/tunnel.h"]}],"references":[{"url":"https://git.kernel.org/stable/c/47d60ea801fc333a10c576691eca2e7840b02d3d"},{"url":"https://git.kernel.org/stable/c/12f5d8b85a66a0ac08d082517d92ce136f8c0d42"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T09:24:02.145Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.14","versionEndExcluding":"7.2.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.14","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}