122 lines
6.4 KiB
JSON
122 lines
6.4 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2025-40002",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2025-04-16T07:20:57.151Z",
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"datePublished": "2025-10-18T08:03:22.718Z",
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"dateUpdated": "2026-05-11T21:40:34.575Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-05-11T21:40:34.575Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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."
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/thunderbolt/tunnel.c"
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],
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"versions": [
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{
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"version": "d6d458d42e1e1544a18f37f1d5c840e00d5261b9",
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"lessThan": "c07923f6a8729fc27ee652221a51702ff6654097",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "d6d458d42e1e1544a18f37f1d5c840e00d5261b9",
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"lessThan": "67600ccfc4f38ebd331b9332ac94717bfbc87ea7",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/thunderbolt/tunnel.c"
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],
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"versions": [
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{
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"version": "6.14",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.14",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.17.3",
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"lessThanOrEqual": "6.17.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.14",
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"versionEndExcluding": "6.17.3"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.14",
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"versionEndExcluding": "6.18"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/c07923f6a8729fc27ee652221a51702ff6654097"
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},
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{
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"url": "https://git.kernel.org/stable/c/67600ccfc4f38ebd331b9332ac94717bfbc87ea7"
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}
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],
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"title": "thunderbolt: Fix use-after-free in tb_dp_dprx_work",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |