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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: mmp_pdma: Fix race condition in mmp_pdma_residue()\n\nAdd proper locking in mmp_pdma_residue() to prevent use-after-free when\naccessing descriptor list and descriptor contents.\n\nThe race occurs when multiple threads call tx_status() while the tasklet\non another CPU is freeing completed descriptors:\n\nCPU 0                              CPU 1\n-----                              -----\nmmp_pdma_tx_status()\nmmp_pdma_residue()\n  -\u003e NO LOCK held\n     list_for_each_entry(sw, ..)\n                                   DMA interrupt\n                                   dma_do_tasklet()\n                                     -\u003e spin_lock(\u0026desc_lock)\n                                        list_move(sw-\u003enode, ...)\n                                        spin_unlock(\u0026desc_lock)\n  |                                     dma_pool_free(sw) \u003c- FREED!\n  -\u003e access sw-\u003edesc \u003c- UAF!\n\nThis issue can be reproduced when running dmatest on the same channel with\nmultiple threads (threads_per_chan \u003e 1).\n\nFix by protecting the chain_running list iteration and descriptor access\nwith the chan-\u003edesc_lock spinlock."
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            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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              "value": "AV:L - The vulnerable DMA status path is reached through local DMAengine clients or device operations, not directly through network packets or physical insertion.\nAC:L - An attacker can repeatedly issue concurrent non-cyclic transfers and status queries, controlling the workload that produces both descriptor completion and stale traversal without relying on an uncontrollable condition.\nPR:L - Although the demonstrated dmatest configuration is normally root-controlled, userspace-accessible DMA clients are reasonable on affected embedded deployments and the provider performs no capability check. Following the highest-severity rule, a basic local user is sufficient.\nUI:N - Exploitation requires no action by another user after the attacker initiates the concurrent DMA operations.\nS:U - The UAF compromises the same host kernel security authority; it does not inherently cross a guest-host, sandbox, or IOMMU boundary.\nC:H - The descriptor and list links are accessed after dma_pool_free() and may contain recycled attacker-influenced contents; under the required UAF guidance this has high confidentiality impact.\nI:H - The kernel UAF permits freed descriptor storage to be reclaimed while stale references remain, making heap manipulation and code-execution primitives defensible under the supplied scoring guidance.\nA:H - Freed or poisoned list pointers can be dereferenced during iteration, causing a kernel oops or panic, and the race can be triggered repeatedly."
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-71221",
    "datePublished": "2026-02-14T16:27:04.631Z",
    "dateReserved": "2026-02-14T16:26:02.969Z",
    "dateUpdated": "2026-09-08T08:44:16.241Z",
    "state": "PUBLISHED"
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}