{
  "threat_severity" : "Low",
  "public_date" : "2026-05-06T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: PCI: Fix pci_slot_trylock() error handling",
    "id" : "2467187",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2467187"
  },
  "cvss3" : {
    "cvss3_base_score" : "5.5",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
    "status" : "draft"
  },
  "cwe" : "CWE-832",
  "details" : [ "In the Linux kernel, the following vulnerability has been resolved:\nPCI: Fix pci_slot_trylock() error handling\nCommit a4e772898f8b (\"PCI: Add missing bridge lock to pci_bus_lock()\")\ndelegates the bridge device's pci_dev_trylock() to pci_bus_trylock() in\npci_slot_trylock(), but it forgets to remove the corresponding\npci_dev_unlock() when pci_bus_trylock() fails.\nBefore a4e772898f8b, the code did:\nif (!pci_dev_trylock(dev)) /* <- lock bridge device */\ngoto unlock;\nif (dev->subordinate) {\nif (!pci_bus_trylock(dev->subordinate)) {\npci_dev_unlock(dev);   /* <- unlock bridge device */\ngoto unlock;\n}\n}\nAfter a4e772898f8b the bridge-device lock is no longer taken, but the\npci_dev_unlock(dev) on the failure path was left in place, leading to the\nbug.\nThis yields one of two errors:\n1. A warning that the lock is being unlocked when no one holds it.\n2. An incorrect unlock of a lock that belongs to another thread.\nFix it by removing the now-redundant pci_dev_unlock(dev) on the failure\npath.\n[Same patch later posted by Keith at\nhttps://patch.msgid.link/20260116184150.3013258-1-kbusch@meta.com]", "A flaw was found in the Linux kernel. An error in the PCI (Peripheral Component Interconnect) subsystem's lock management, specifically within the pci_slot_trylock() function, can lead to system instability. This occurs when a lock is incorrectly released, potentially causing warnings or interfering with other processes. A local attacker could exploit this to cause a denial of service." ],
  "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" : "Out of support scope",
    "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" : "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-2026-43211\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43211\nhttps://lore.kernel.org/linux-cve-announce/2026050649-CVE-2026-43211-5383@gregkh/T" ],
  "name" : "CVE-2026-43211",
  "csaw" : false
}