{"id":"CVE-2025-71221","title":"dmaengine: mmp_pdma: Fix race condition in mmp_pdma_residue()","summary":"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 des…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 1b38da264674d6a0fe26a63996b8f88b88c3da48 < 3f0e0e2d9e752570041e95fd04635e2580097819","Linux >= 1b38da264674d6a0fe26a63996b8f88b88c3da48 < dfb5e05227745de43b7fd589721817a4337c970d","Linux >= 1b38da264674d6a0fe26a63996b8f88b88c3da48 < eba0c75670c022cb1f948600db972524bcfe8166","Linux >= 1b38da264674d6a0fe26a63996b8f88b88c3da48 < fc023b8fab057f0c910856ff36d3e12a30b7af4a","Linux >= 1b38da264674d6a0fe26a63996b8f88b88c3da48 < 9f665b3c3d9a168410251f27a5d019b7bf93185c","Linux >= 1b38da264674d6a0fe26a63996b8f88b88c3da48 < a143545855bc2c6e1330f6f57ae375ac44af00a7","Linux 3.16"],"published":"2026-02-14","updated":"2026-09-08","sourceUpdated":"2026-09-08T08:44:16.241Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-71221","references":[{"url":"https://git.kernel.org/stable/c/3f0e0e2d9e752570041e95fd04635e2580097819"},{"url":"https://git.kernel.org/stable/c/dfb5e05227745de43b7fd589721817a4337c970d"},{"url":"https://git.kernel.org/stable/c/eba0c75670c022cb1f948600db972524bcfe8166"},{"url":"https://git.kernel.org/stable/c/fc023b8fab057f0c910856ff36d3e12a30b7af4a"},{"url":"https://git.kernel.org/stable/c/9f665b3c3d9a168410251f27a5d019b7bf93185c"},{"url":"https://git.kernel.org/stable/c/a143545855bc2c6e1330f6f57ae375ac44af00a7"}],"tags":["cve.org"],"epss":0.001,"epssPercentile":0.00794,"ingestedAt":"2026-09-08T15:33:26.994Z","slug":"CVE-2025-71221","body":"## Overview\n\nIn 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  -> NO LOCK held\n     list_for_each_entry(sw, ..)\n                                   DMA interrupt\n                                   dma_do_tasklet()\n                                     -> spin_lock(&desc_lock)\n                                        list_move(sw->node, ...)\n                                        spin_unlock(&desc_lock)\n  |                                     dma_pool_free(sw) <- FREED!\n  -> access sw->desc <- UAF!\n\nThis issue can be reproduced when running dmatest on the same channel with\nmultiple threads (threads_per_chan > 1).\n\nFix by protecting the chain_running list iteration and descriptor access\nwith the chan->desc_lock spinlock.\n\n## Affected\n\n- `Linux >= 1b38da264674d6a0fe26a63996b8f88b88c3da48 < 3f0e0e2d9e752570041e95fd04635e2580097819`\n- `Linux >= 1b38da264674d6a0fe26a63996b8f88b88c3da48 < dfb5e05227745de43b7fd589721817a4337c970d`\n- `Linux >= 1b38da264674d6a0fe26a63996b8f88b88c3da48 < eba0c75670c022cb1f948600db972524bcfe8166`\n- `Linux >= 1b38da264674d6a0fe26a63996b8f88b88c3da48 < fc023b8fab057f0c910856ff36d3e12a30b7af4a`\n- `Linux >= 1b38da264674d6a0fe26a63996b8f88b88c3da48 < 9f665b3c3d9a168410251f27a5d019b7bf93185c`\n- `Linux >= 1b38da264674d6a0fe26a63996b8f88b88c3da48 < a143545855bc2c6e1330f6f57ae375ac44af00a7`\n- `Linux 3.16`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}