{"id":"CVE-2025-71221","title":"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…","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","cwe":["CWE-362"],"vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 3.16, < 6.18.10","linux_kernel = 6.19"],"patched":["linux_kernel 6.18.10"],"published":"2026-02-14","updated":"2026-10-15","sourceUpdated":"2026-10-15T02:18:25.190","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-71221","references":[{"url":"https://git.kernel.org/stable/c/3f0e0e2d9e752570041e95fd04635e2580097819","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9f665b3c3d9a168410251f27a5d019b7bf93185c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/a143545855bc2c6e1330f6f57ae375ac44af00a7","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/dfb5e05227745de43b7fd589721817a4337c970d","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/eba0c75670c022cb1f948600db972524bcfe8166","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/fc023b8fab057f0c910856ff36d3e12a30b7af4a","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-019113.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-082556.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-457936.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}],"tags":["nvd","cve.org"],"epss":0.00116,"epssPercentile":0.01564,"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_kernel >= 3.16, < 6.18.10`\n- `linux_kernel = 6.19`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 6.18.10`","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}