{
  "threat_severity" : "Moderate",
  "public_date" : "2025-11-12T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: blk-mq: fix potential deadlock while nr_requests grown",
    "id" : "2414500",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2414500"
  },
  "cvss3" : {
    "cvss3_base_score" : "6.2",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
    "status" : "draft"
  },
  "cwe" : "CWE-833",
  "details" : [ "In the Linux kernel, the following vulnerability has been resolved:\nblk-mq: fix potential deadlock while nr_requests grown\nAllocate and free sched_tags while queue is freezed can deadlock[1],\nthis is a long term problem, hence allocate memory before freezing\nqueue and free memory after queue is unfreezed.\n[1] https://lore.kernel.org/all/0659ea8d-a463-47c8-9180-43c719e106eb@linux.ibm.com/" ],
  "statement" : "The patch fixes a potential deadlock in the block multiqueue subsystem when growing nr_requests.\nPreviously, allocation and freeing of scheduler tags occurred while the queue was frozen, leading to circular lock dependencies between freeze/unfreeze and tag updates.\nThis bug could hang the system under heavy I/O but doesn’t allow privilege escalation - it’s a local kernel-level DoS with medium severity.",
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 10",
    "fix_state" : "Fix deferred",
    "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" : "Fix deferred",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Fix deferred",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Fix deferred",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Fix deferred",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Fix deferred",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Fix deferred",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2025-40146\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-40146\nhttps://lore.kernel.org/linux-cve-announce/2025111256-CVE-2025-40146-b919@gregkh/T" ],
  "name" : "CVE-2025-40146",
  "csaw" : false
}