{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2025-40002", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T07:20:57.151Z", "datePublished": "2025-10-18T08:03:22.718Z", "dateUpdated": "2025-12-01T06:16:15.108Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2025-12-01T06:16:15.108Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nthunderbolt: Fix use-after-free in tb_dp_dprx_work\n\nThe original code relies on cancel_delayed_work() in tb_dp_dprx_stop(),\nwhich does not ensure that the delayed work item tunnel->dprx_work has\nfully completed if it was already running. This leads to use-after-free\nscenarios where tb_tunnel is deallocated by tb_tunnel_put(), while\ntunnel->dprx_work remains active and attempts to dereference tb_tunnel\nin tb_dp_dprx_work().\n\nA typical race condition is illustrated below:\n\nCPU 0 | CPU 1\ntb_dp_tunnel_active() |\n tb_deactivate_and_free_tunnel()| tb_dp_dprx_start()\n tb_tunnel_deactivate() | queue_delayed_work()\n tb_dp_activate() |\n tb_dp_dprx_stop() | tb_dp_dprx_work() //delayed worker\n cancel_delayed_work() |\n tb_tunnel_put(tunnel); |\n | tunnel = container_of(...); //UAF\n | tunnel-> //UAF\n\nReplacing cancel_delayed_work() with cancel_delayed_work_sync() is\nnot feasible as it would introduce a deadlock: both tb_dp_dprx_work()\nand the cleanup path acquire tb->lock, and cancel_delayed_work_sync()\nwould wait indefinitely for the work item that cannot proceed.\n\nInstead, implement proper reference counting:\n- If cancel_delayed_work() returns true (work is pending), we release\n the reference in the stop function.\n- If it returns false (work is executing or already completed), the\n reference is released in delayed work function itself.\n\nThis ensures the tb_tunnel remains valid during work item execution\nwhile preventing memory leaks.\n\nThis bug was found by static analysis."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/thunderbolt/tunnel.c"], "versions": [{"version": "d6d458d42e1e1544a18f37f1d5c840e00d5261b9", "lessThan": "c07923f6a8729fc27ee652221a51702ff6654097", "status": "affected", "versionType": "git"}, {"version": "d6d458d42e1e1544a18f37f1d5c840e00d5261b9", "lessThan": "67600ccfc4f38ebd331b9332ac94717bfbc87ea7", "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/tunnel.c"], "versions": [{"version": "6.14", "status": "affected"}, {"version": "0", "lessThan": "6.14", "status": "unaffected", "versionType": "semver"}, {"version": "6.17.3", "lessThanOrEqual": "6.17.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18", "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": "6.14", "versionEndExcluding": "6.17.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14", "versionEndExcluding": "6.18"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/c07923f6a8729fc27ee652221a51702ff6654097"}, {"url": "https://git.kernel.org/stable/c/67600ccfc4f38ebd331b9332ac94717bfbc87ea7"}], "title": "thunderbolt: Fix use-after-free in tb_dp_dprx_work", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nthunderbolt: Fix use-after-free in tb_dp_dprx_work\n\nThe original code relies on cancel_delayed_work() in tb_dp_dprx_stop(),\nwhich does not ensure that the delayed work item tunnel->dprx_work has\nfully completed if it was already running. This leads to use-after-free\nscenarios where tb_tunnel is deallocated by tb_tunnel_put(), while\ntunnel->dprx_work remains active and attempts to dereference tb_tunnel\nin tb_dp_dprx_work().\n\nA typical race condition is illustrated below:\n\nCPU 0 | CPU 1\ntb_dp_tunnel_active() |\n tb_deactivate_and_free_tunnel()| tb_dp_dprx_start()\n tb_tunnel_deactivate() | queue_delayed_work()\n tb_dp_activate() |\n tb_dp_dprx_stop() | tb_dp_dprx_work() //delayed worker\n cancel_delayed_work() |\n tb_tunnel_put(tunnel); |\n | tunnel = container_of(...); //UAF\n | tunnel-> //UAF\n\nReplacing cancel_delayed_work() with cancel_delayed_work_sync() is\nnot feasible as it would introduce a deadlock: both tb_dp_dprx_work()\nand the cleanup path acquire tb->lock, and cancel_delayed_work_sync()\nwould wait indefinitely for the work item that cannot proceed.\n\nInstead, implement proper reference counting:\n- If cancel_delayed_work() returns true (work is pending), we release\n the reference in the stop function.\n- If it returns false (work is executing or already completed), the\n reference is released in delayed work function itself.\n\nThis ensures the tb_tunnel remains valid during work item execution\nwhile preventing memory leaks.\n\nThis bug was found by static analysis."}], "id": "CVE-2025-40002", "lastModified": "2025-10-21T19:31:25.450", "metrics": {}, "published": "2025-10-18T08:15:34.243", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/67600ccfc4f38ebd331b9332ac94717bfbc87ea7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c07923f6a8729fc27ee652221a51702ff6654097"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Awaiting Analysis"}

{"bugzilla": {"description": "kernel: thunderbolt: Fix use-after-free in tb_dp_dprx_work", "id": "2404904", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2404904"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nthunderbolt: Fix use-after-free in tb_dp_dprx_work\nThe original code relies on cancel_delayed_work() in tb_dp_dprx_stop(),\nwhich does not ensure that the delayed work item tunnel->dprx_work has\nfully completed if it was already running. This leads to use-after-free\nscenarios where tb_tunnel is deallocated by tb_tunnel_put(), while\ntunnel->dprx_work remains active and attempts to dereference tb_tunnel\nin tb_dp_dprx_work().\nA typical race condition is illustrated below:\nCPU 0 | CPU 1\ntb_dp_tunnel_active() |\ntb_deactivate_and_free_tunnel()| tb_dp_dprx_start()\ntb_tunnel_deactivate() | queue_delayed_work()\ntb_dp_activate() |\ntb_dp_dprx_stop() | tb_dp_dprx_work() //delayed worker\ncancel_delayed_work() |\ntb_tunnel_put(tunnel); |\n| tunnel = container_of(...); //UAF\n| tunnel-> //UAF\nReplacing cancel_delayed_work() with cancel_delayed_work_sync() is\nnot feasible as it would introduce a deadlock: both tb_dp_dprx_work()\nand the cleanup path acquire tb->lock, and cancel_delayed_work_sync()\nwould wait indefinitely for the work item that cannot proceed.\nInstead, implement proper reference counting:\n- If cancel_delayed_work() returns true (work is pending), we release\nthe reference in the stop function.\n- If it returns false (work is executing or already completed), the\nreference is released in delayed work function itself.\nThis ensures the tb_tunnel remains valid during work item execution\nwhile preventing memory leaks.\nThis bug was found by static analysis."], "name": "CVE-2025-40002", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-10-18T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-40002\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-40002\nhttps://lore.kernel.org/linux-cve-announce/2025101828-CVE-2025-40002-a9c1@gregkh/T"], "threat_severity": "Moderate"}