302 lines
15 KiB
JSON
302 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-2024-26769",
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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": "2024-02-19T14:20:24.175Z",
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"datePublished": "2024-04-03T17:00:56.019Z",
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"dateUpdated": "2026-08-05T11:27:08.686Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T11:27:08.686Z"
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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: avoid deadlock on delete association path\n\nWhen deleting an association the shutdown path is deadlocking because we\ntry to flush the nvmet_wq nested. Avoid this by deadlock by deferring\nthe put work into its own work item."
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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 - nvmet-fc is the in-kernel NVMe-over-Fibre-Channel target; the association-delete path is driven by FC-NVMe Link Service traffic (Create/Disconnect Association) received from a remote initiator via `nvmet_fc_rcv_ls_req()`, and the deadlocking put occurs in the completion of the target-generated Disconnect Association LS. This matches the treatment of other NVMe target transports (nvmet-tcp/nvmet-fc) as network-reachable, and is consistent with CVE-2025-40171 on the same code.\nAC:L - A remote peer controls both sides of the race — it repeatedly creates associations and issues Disconnect Association LSes (or drops connectivity, triggering `nvmet_fc_invalidate_host()`), driving `del_work` and the LS completion onto `nvmet_wq` at will while the targetport reference count is winding down. No memory grooming or attacker-independent condition is required, and the trigger can be retried indefinitely.\nPR:N - FC-NVMe Link Service handling (`nvmet_fc_handle_ls_rqst()` → `nvmet_fc_ls_create_association()`/`nvmet_fc_ls_disconnect()`) runs before any NVMe-level authentication — it is the connect handshake itself, so no credentials or privileges are needed to reach the vulnerable teardown path.\nUI:N - The deadlock is reached purely through LS traffic processed asynchronously on `nvmet_wq` plus normal target-port teardown; no action by a local user or administrator on the victim is required to trigger it.\nS:U - The deadlock is confined to the kernel's NVMe target subsystem and its workqueue; no security boundary (VM, IOMMU, sandbox) is crossed and no other security authority's resources are affected.\nC:N - The bug is a nested workqueue flush that hangs; there is no out-of-bounds read, no use-after-free, and no path by which memory contents are exposed to the attacker.\nI:N - No memory is corrupted and no data is modified — the fix merely defers an existing `kref_put()` into its own work item, so there is no write primitive or control-flow impact.\nA:H - `fcloop_targetport_delete()` calls `flush_work()` on the work item that is itself executing, deadlocking a `nvmet_wq` kworker permanently; this wedges the shared WQ_MEM_RECLAIM `nvmet_wq` used by all nvmet transports and blocks `nvmet_fc_unregister_targetport()`/`nvmet_fc_exit_module()` in `flush_workqueue()` forever, requiring 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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"programFiles": [
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"drivers/nvme/target/fc.c"
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"lessThanOrEqual": "*",
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"versionType": "original_commit_for_fix"
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"timestamp": "2024-07-16T14:13:29.356049Z",
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"id": "CVE-2024-26769",
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