{
  "threat_severity" : "Moderate",
  "public_date" : "2026-02-14T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: dmaengine: mmp_pdma: Fix race condition in mmp_pdma_residue()",
    "id" : "2439909",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2439909"
  },
  "details" : [ "In the Linux kernel, the following vulnerability has been resolved:\ndmaengine: mmp_pdma: Fix race condition in mmp_pdma_residue()\nAdd proper locking in mmp_pdma_residue() to prevent use-after-free when\naccessing descriptor list and descriptor contents.\nThe race occurs when multiple threads call tx_status() while the tasklet\non another CPU is freeing completed descriptors:\nCPU 0                              CPU 1\n-----                              -----\nmmp_pdma_tx_status()\nmmp_pdma_residue()\n-> NO LOCK held\nlist_for_each_entry(sw, ..)\nDMA interrupt\ndma_do_tasklet()\n-> spin_lock(&desc_lock)\nlist_move(sw->node, ...)\nspin_unlock(&desc_lock)\n|                                     dma_pool_free(sw) <- FREED!\n-> access sw->desc <- UAF!\nThis issue can be reproduced when running dmatest on the same channel with\nmultiple threads (threads_per_chan > 1).\nFix by protecting the chain_running list iteration and descriptor access\nwith the chan->desc_lock spinlock." ],
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 10",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 6",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Not affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Not affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Not affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2025-71221\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-71221\nhttps://lore.kernel.org/linux-cve-announce/2026021426-CVE-2025-71221-2987@gregkh/T" ],
  "name" : "CVE-2025-71221",
  "csaw" : false
}