290 lines
15 KiB
JSON
290 lines
15 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-2025-40171",
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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": "2025-04-16T07:20:57.176Z",
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"datePublished": "2025-11-12T10:46:52.289Z",
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"dateUpdated": "2026-10-15T22:02:39.456Z"
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},
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"cna": {
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T12:08:16.789Z"
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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\nnvmet-fc: move lsop put work to nvmet_fc_ls_req_op\n\nIt’s possible for more than one async command to be in flight from\n__nvmet_fc_send_ls_req. For each command, a tgtport reference is taken.\n\nIn the current code, only one put work item is queued at a time, which\nresults in a leaked reference.\n\nTo fix this, move the work item to the nvmet_fc_ls_req_op struct, which\nalready tracks all resources related to the command."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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"baseScore": 7.5,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:N - The trigger is a remote FC-NVMe initiator sending Create Association / Disconnect Association Link Services to the nvmet-fc target port, processed via `nvmet_fc_rcv_ls_req()` from the LLDD (lpfc). Consistent with other NVMe-oF target CVEs in this tree (including qla2xxx FC), the attacker is a remote peer on the storage fabric, which can itself be extended over routed transports.\nAC:L - The attacker controls both sides of the timing — issuing several associations and then disconnecting them concurrently reliably puts multiple LS requests in flight, and `queue_work()` deterministically drops every put after the first while one is pending. No memory-layout or victim-state condition is involved.\nPR:N - `nvmet_fc_ls_create_association()` and `nvmet_fc_ls_disconnect()` validate only LS descriptor lengths and tags; there is no host-NQN allow-list check, NVMe Connect, or authentication on this path. Any initiator that can reach the target port exercises it pre-authentication.\nUI:N - The leak is produced entirely by attacker-sent Link Service frames handled asynchronously by the target. No administrator or local user action is required.\nS:U - The leaked reference, stranded allocation, and failed teardown are all confined to the kernel of the target host. No security authority boundary such as a VM or IOMMU domain is crossed.\nC:N - The defect is purely a missed `kref_put()`; nothing is freed early, read out of bounds, or returned to the attacker. Tracing the coalescing shows it can only drop puts, never duplicate them, so no use-after-free read primitive exists.\nI:N - No memory is corrupted or written out of bounds — the refcount only ever ends too high, so no write or control-flow-hijack primitive arises. lpfc additionally guards its on-stack completion in `lpfc_nvmet_targetport_delete()`, closing the only late-completion write hazard.\nA:H - The tgtport is never freed, so `nvmet_fc_free_ls_iodlist()` and `targetport_delete` never run: `lpfc_nvmet_destroy_targetport()` stalls for `LPFC_NVMET_WAIT_TMO` (5 s) and then aborts with an error, permanently stranding the target port, its HBA DMA mappings, and a `get_device()` reference that no longer can be released without a reboot."
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}
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]
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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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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"status": "affected",
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"title": "nvmet-fc: move lsop put work to nvmet_fc_ls_req_op",
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"type": "ssvc",
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"content": {
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"id": "CVE-2025-40171",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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"Technical Impact": "partial"
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"timestamp": "2026-10-15T21:57:33.774431Z"
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} |