{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2021-47512",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2021-47512",
    "idYear": 2021,
    "status": "PUBLISHED",
    "publishedAt": "2024-05-24T15:09:27.356Z",
    "updatedAt": "2026-08-05T08:48:11.315Z",
    "importedAt": "2026-10-24T01:56:36.661Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "net/sched: fq_pie: prevent dismantle issue",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: fq_pie: prevent dismantle issue\n\nFor some reason, fq_pie_destroy() did not copy\nworking code from pie_destroy() and other qdiscs,\nthus causing elusive bug.\n\nBefore calling del_timer_sync(&q->adapt_timer),\nwe need to ensure timer will not rearm itself.\n\nrcu: INFO: rcu_preempt self-detected stall on CPU\nrcu:    0-....: (4416 ticks this GP) idle=60d/1/0x4000000000000000 softirq=10433/10434 fqs=2579\n        (t=10501 jiffies g=13085 q=3989)\nNMI backtrace for cpu 0\nCPU: 0 PID: 13 Comm: ksoftirqd/0 Not tainted 5.16.0-rc4-syzkaller #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011\nCall Trace:\n <IRQ>\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106\n nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:111\n nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62\n trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]\n rcu_dump_cpu_stacks+0x25e/0x3f0 kernel/rcu/tree_stall.h:343\n print_cpu_stall kernel/rcu/tree_stall.h:627 [inline]\n check_cpu_stall kernel/rcu/tree_stall.h:711 [inline]\n rcu_pending kernel/rcu/tree.c:3878 [inline]\n rcu_sched_clock_irq.cold+0x9d/0x746 kernel/rcu/tree.c:2597\n update_process_times+0x16d/0x200 kernel/time/timer.c:1785\n tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226\n tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1428\n __run_hrtimer kernel/time/hrtimer.c:1685 [inline]\n __hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1749\n hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811\n local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline]\n __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1103\n sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1097\n </IRQ>\n <TASK>\n asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638\nRIP: 0010:write_comp_data kernel/kcov.c:221 [inline]\nRIP: 0010:__sanitizer_cov_trace_const_cmp1+0x1d/0x80 kernel/kcov.c:273\nCode: 54 c8 20 48 89 10 c3 66 0f 1f 44 00 00 53 41 89 fb 41 89 f1 bf 03 00 00 00 65 48 8b 0c 25 40 70 02 00 48 89 ce 4c 8b 54 24 08 <e8> 4e f7 ff ff 84 c0 74 51 48 8b 81 88 15 00 00 44 8b 81 84 15 00\nRSP: 0018:ffffc90000d27b28 EFLAGS: 00000246\nRAX: 0000000000000000 RBX: ffff888064bf1bf0 RCX: ffff888011928000\nRDX: ffff888011928000 RSI: ffff888011928000 RDI: 0000000000000003\nRBP: ffff888064bf1c28 R08: 0000000000000000 R09: 0000000000000000\nR10: ffffffff875d8295 R11: 0000000000000000 R12: 0000000000000000\nR13: ffff8880783dd300 R14: 0000000000000000 R15: 0000000000000000\n pie_calculate_probability+0x405/0x7c0 net/sched/sch_pie.c:418\n fq_pie_timer+0x170/0x2a0 net/sched/sch_fq_pie.c:383\n call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421\n expire_timers kernel/time/timer.c:1466 [inline]\n __run_timers.part.0+0x675/0xa20 kernel/time/timer.c:1734\n __run_timers kernel/time/timer.c:1715 [inline]\n run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1747\n __do_softirq+0x29b/0x9c2 kernel/softirq.c:558\n run_ksoftirqd kernel/softirq.c:921 [inline]\n run_ksoftirqd+0x2d/0x60 kernel/softirq.c:913\n smpboot_thread_fn+0x645/0x9c0 kernel/smpboot.c:164\n kthread+0x405/0x4f0 kernel/kthread.c:327\n ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295\n </TASK>",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "ec97ecf1ebe485a17cd8395a5f35e6b80b57665a",
              "status": "affected",
              "versionType": "git",
              "lessThan": "2a51edaf5cc563574878b93d7ef3d5955dda7030"
            },
            {
              "version": "ec97ecf1ebe485a17cd8395a5f35e6b80b57665a",
              "status": "affected",
              "versionType": "git",
              "lessThan": "d86216dfda7c98375f809e26a30bfdaaba21d46e"
            },
            {
              "version": "ec97ecf1ebe485a17cd8395a5f35e6b80b57665a",
              "status": "affected",
              "versionType": "git",
              "lessThan": "61c2402665f1e10c5742033fce18392e369931d7"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "5.6",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "5.6"
            },
            {
              "version": "5.10.85",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.15.8",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "5.16",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}