{
  "threat_severity" : "Low",
  "public_date" : "2025-12-24T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: rcu: Fix __this_cpu_read() lockdep warning in rcu_force_quiescent_state()",
    "id" : "2425092",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2425092"
  },
  "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" : "verified"
  },
  "cwe" : "CWE-821",
  "details" : [ "In the Linux kernel, the following vulnerability has been resolved:\nrcu: Fix __this_cpu_read() lockdep warning in rcu_force_quiescent_state()\nRunning rcutorture with non-zero fqs_duration module parameter in a\nkernel built with CONFIG_PREEMPTION=y results in the following splat:\nBUG: using __this_cpu_read() in preemptible [00000000]\ncode: rcu_torture_fqs/398\ncaller is __this_cpu_preempt_check+0x13/0x20\nCPU: 3 PID: 398 Comm: rcu_torture_fqs Not tainted 6.0.0-rc1-yoctodev-standard+\nCall Trace:\n<TASK>\ndump_stack_lvl+0x5b/0x86\ndump_stack+0x10/0x16\ncheck_preemption_disabled+0xe5/0xf0\n__this_cpu_preempt_check+0x13/0x20\nrcu_force_quiescent_state.part.0+0x1c/0x170\nrcu_force_quiescent_state+0x1e/0x30\nrcu_torture_fqs+0xca/0x160\n? rcu_torture_boost+0x430/0x430\nkthread+0x192/0x1d0\n? kthread_complete_and_exit+0x30/0x30\nret_from_fork+0x22/0x30\n</TASK>\nThe problem is that rcu_force_quiescent_state() uses __this_cpu_read()\nin preemptible code instead of the proper raw_cpu_read().  This commit\ntherefore changes __this_cpu_read() to raw_cpu_read().", "A lockdep warning was found in the Linux kernel's RCU subsystem. The rcu_force_quiescent_state() function incorrectly uses __this_cpu_read() in preemptible code context. This macro requires preemption to be disabled, but the code can be called from preemptible context during rcutorture testing, triggering a lockdep warning." ],
  "statement" : "This is a lockdep/debugging warning that occurs when running rcutorture with specific parameters on preemptible kernels. The warning indicates improper use of per-CPU access macros but does not cause a crash or security vulnerability in normal operation. The fix simply changes to the appropriate raw_cpu_read() macro.",
  "affected_release" : [ {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2023-11-07T00:00:00Z",
    "advisory" : "RHSA-2023:6583",
    "cpe" : "cpe:/a:redhat:enterprise_linux:9",
    "package" : "kernel-0:5.14.0-362.8.1.el9_3"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2023-11-07T00:00:00Z",
    "advisory" : "RHSA-2023:6583",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9",
    "package" : "kernel-0:5.14.0-362.8.1.el9_3"
  } ],
  "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" : "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-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2022-50771\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-50771\nhttps://lore.kernel.org/linux-cve-announce/2025122458-CVE-2022-50771-3440@gregkh/T" ],
  "name" : "CVE-2022-50771",
  "csaw" : false
}