CVE-2024-35892 (GCVE-0-2024-35892)

Vulnerability from cvelistv5 – Published: 2024-05-19 08:34 – Updated: 2026-05-23 15:44
VLAI
Title
net/sched: fix lockdep splat in qdisc_tree_reduce_backlog()
Summary
In the Linux kernel, the following vulnerability has been resolved: net/sched: fix lockdep splat in qdisc_tree_reduce_backlog() qdisc_tree_reduce_backlog() is called with the qdisc lock held, not RTNL. We must use qdisc_lookup_rcu() instead of qdisc_lookup() syzbot reported: WARNING: suspicious RCU usage 6.1.74-syzkaller #0 Not tainted ----------------------------- net/sched/sch_api.c:305 suspicious rcu_dereference_protected() usage! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 3 locks held by udevd/1142: #0: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:306 [inline] #0: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline] #0: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, at: net_tx_action+0x64a/0x970 net/core/dev.c:5282 #1: ffff888171861108 (&sch->q.lock){+.-.}-{2:2}, at: spin_lock include/linux/spinlock.h:350 [inline] #1: ffff888171861108 (&sch->q.lock){+.-.}-{2:2}, at: net_tx_action+0x754/0x970 net/core/dev.c:5297 #2: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:306 [inline] #2: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline] #2: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, at: qdisc_tree_reduce_backlog+0x84/0x580 net/sched/sch_api.c:792 stack backtrace: CPU: 1 PID: 1142 Comm: udevd Not tainted 6.1.74-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 Call Trace: <TASK> [<ffffffff85b85f14>] __dump_stack lib/dump_stack.c:88 [inline] [<ffffffff85b85f14>] dump_stack_lvl+0x1b1/0x28f lib/dump_stack.c:106 [<ffffffff85b86007>] dump_stack+0x15/0x1e lib/dump_stack.c:113 [<ffffffff81802299>] lockdep_rcu_suspicious+0x1b9/0x260 kernel/locking/lockdep.c:6592 [<ffffffff84f0054c>] qdisc_lookup+0xac/0x6f0 net/sched/sch_api.c:305 [<ffffffff84f037c3>] qdisc_tree_reduce_backlog+0x243/0x580 net/sched/sch_api.c:811 [<ffffffff84f5b78c>] pfifo_tail_enqueue+0x32c/0x4b0 net/sched/sch_fifo.c:51 [<ffffffff84fbcf63>] qdisc_enqueue include/net/sch_generic.h:833 [inline] [<ffffffff84fbcf63>] netem_dequeue+0xeb3/0x15d0 net/sched/sch_netem.c:723 [<ffffffff84eecab9>] dequeue_skb net/sched/sch_generic.c:292 [inline] [<ffffffff84eecab9>] qdisc_restart net/sched/sch_generic.c:397 [inline] [<ffffffff84eecab9>] __qdisc_run+0x249/0x1e60 net/sched/sch_generic.c:415 [<ffffffff84d7aa96>] qdisc_run+0xd6/0x260 include/net/pkt_sched.h:125 [<ffffffff84d85d29>] net_tx_action+0x7c9/0x970 net/core/dev.c:5313 [<ffffffff85e002bd>] __do_softirq+0x2bd/0x9bd kernel/softirq.c:616 [<ffffffff81568bca>] invoke_softirq kernel/softirq.c:447 [inline] [<ffffffff81568bca>] __irq_exit_rcu+0xca/0x230 kernel/softirq.c:700 [<ffffffff81568ae9>] irq_exit_rcu+0x9/0x20 kernel/softirq.c:712 [<ffffffff85b89f52>] sysvec_apic_timer_interrupt+0x42/0x90 arch/x86/kernel/apic/apic.c:1107 [<ffffffff85c00ccb>] asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:656
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-05-23 19:36 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 9d9a38b5639fcefacc1e977567fb4b4e4a74d0b3 , < b7d1ce2cc7192e8a037faa3f5d3ba72c25976460 (git)
Affected: d636fc5dd692c8f4e00ae6e0359c0eceeb5d9bdb , < c040b99461a5bfc14c2d0cbb1780fcc3a4706c7e (git)
Affected: d636fc5dd692c8f4e00ae6e0359c0eceeb5d9bdb , < 07696415526bee0607e495017369c7303a4792e1 (git)
Affected: d636fc5dd692c8f4e00ae6e0359c0eceeb5d9bdb , < 7eb322360b0266481e560d1807ee79e0cef5742b (git)
Affected: 3a4741bb13caf482b877b10ac1bcf7390cad7077 (git)
Affected: 6.1.34 , < 6.1.85 (semver)
Affected: 6.3.8 , < 6.4 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 6.4
Unaffected: 0 , < 6.4 (semver)
Unaffected: 6.1.85 , ≤ 6.1.* (semver)
Unaffected: 6.6.26 , ≤ 6.6.* (semver)
Unaffected: 6.8.5 , ≤ 6.8.* (semver)
Unaffected: 6.9 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: fix lockdep splat in qdisc_tree_reduce_backlog()\n\nqdisc_tree_reduce_backlog() is called with the qdisc lock held,\nnot RTNL.\n\nWe must use qdisc_lookup_rcu() instead of qdisc_lookup()\n\nsyzbot reported:\n\nWARNING: suspicious RCU usage\n6.1.74-syzkaller #0 Not tainted\n-----------------------------\nnet/sched/sch_api.c:305 suspicious rcu_dereference_protected() usage!\n\nother info that might help us debug this:\n\nrcu_scheduler_active = 2, debug_locks = 1\n3 locks held by udevd/1142:\n  #0: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:306 [inline]\n  #0: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline]\n  #0: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, at: net_tx_action+0x64a/0x970 net/core/dev.c:5282\n  #1: ffff888171861108 (\u0026sch-\u003eq.lock){+.-.}-{2:2}, at: spin_lock include/linux/spinlock.h:350 [inline]\n  #1: ffff888171861108 (\u0026sch-\u003eq.lock){+.-.}-{2:2}, at: net_tx_action+0x754/0x970 net/core/dev.c:5297\n  #2: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:306 [inline]\n  #2: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline]\n  #2: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, at: qdisc_tree_reduce_backlog+0x84/0x580 net/sched/sch_api.c:792\n\nstack backtrace:\nCPU: 1 PID: 1142 Comm: udevd Not tainted 6.1.74-syzkaller #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024\nCall Trace:\n \u003cTASK\u003e\n  [\u003cffffffff85b85f14\u003e] __dump_stack lib/dump_stack.c:88 [inline]\n  [\u003cffffffff85b85f14\u003e] dump_stack_lvl+0x1b1/0x28f lib/dump_stack.c:106\n  [\u003cffffffff85b86007\u003e] dump_stack+0x15/0x1e lib/dump_stack.c:113\n  [\u003cffffffff81802299\u003e] lockdep_rcu_suspicious+0x1b9/0x260 kernel/locking/lockdep.c:6592\n  [\u003cffffffff84f0054c\u003e] qdisc_lookup+0xac/0x6f0 net/sched/sch_api.c:305\n  [\u003cffffffff84f037c3\u003e] qdisc_tree_reduce_backlog+0x243/0x580 net/sched/sch_api.c:811\n  [\u003cffffffff84f5b78c\u003e] pfifo_tail_enqueue+0x32c/0x4b0 net/sched/sch_fifo.c:51\n  [\u003cffffffff84fbcf63\u003e] qdisc_enqueue include/net/sch_generic.h:833 [inline]\n  [\u003cffffffff84fbcf63\u003e] netem_dequeue+0xeb3/0x15d0 net/sched/sch_netem.c:723\n  [\u003cffffffff84eecab9\u003e] dequeue_skb net/sched/sch_generic.c:292 [inline]\n  [\u003cffffffff84eecab9\u003e] qdisc_restart net/sched/sch_generic.c:397 [inline]\n  [\u003cffffffff84eecab9\u003e] __qdisc_run+0x249/0x1e60 net/sched/sch_generic.c:415\n  [\u003cffffffff84d7aa96\u003e] qdisc_run+0xd6/0x260 include/net/pkt_sched.h:125\n  [\u003cffffffff84d85d29\u003e] net_tx_action+0x7c9/0x970 net/core/dev.c:5313\n  [\u003cffffffff85e002bd\u003e] __do_softirq+0x2bd/0x9bd kernel/softirq.c:616\n  [\u003cffffffff81568bca\u003e] invoke_softirq kernel/softirq.c:447 [inline]\n  [\u003cffffffff81568bca\u003e] __irq_exit_rcu+0xca/0x230 kernel/softirq.c:700\n  [\u003cffffffff81568ae9\u003e] irq_exit_rcu+0x9/0x20 kernel/softirq.c:712\n  [\u003cffffffff85b89f52\u003e] sysvec_apic_timer_interrupt+0x42/0x90 arch/x86/kernel/apic/apic.c:1107\n  [\u003cffffffff85c00ccb\u003e] asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:656"
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    "cveId": "CVE-2024-35892",
    "datePublished": "2024-05-19T08:34:47.914Z",
    "dateReserved": "2024-05-17T13:50:33.113Z",
    "dateUpdated": "2026-05-23T15:44:48.543Z",
    "state": "PUBLISHED"
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    "epss": {
      "cve": "CVE-2024-35892",
      "date": "2026-09-24",
      "epss": "0.00172",
      "percentile": "0.05779"
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      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: fix lockdep splat in qdisc_tree_reduce_backlog()\n\nqdisc_tree_reduce_backlog() is called with the qdisc lock held,\nnot RTNL.\n\nWe must use qdisc_lookup_rcu() instead of qdisc_lookup()\n\nsyzbot reported:\n\nWARNING: suspicious RCU usage\n6.1.74-syzkaller #0 Not tainted\n-----------------------------\nnet/sched/sch_api.c:305 suspicious rcu_dereference_protected() usage!\n\nother info that might help us debug this:\n\nrcu_scheduler_active = 2, debug_locks = 1\n3 locks held by udevd/1142:\n  #0: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:306 [inline]\n  #0: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline]\n  #0: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, at: net_tx_action+0x64a/0x970 net/core/dev.c:5282\n  #1: ffff888171861108 (\u0026sch-\u003eq.lock){+.-.}-{2:2}, at: spin_lock include/linux/spinlock.h:350 [inline]\n  #1: ffff888171861108 (\u0026sch-\u003eq.lock){+.-.}-{2:2}, at: net_tx_action+0x754/0x970 net/core/dev.c:5297\n  #2: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:306 [inline]\n  #2: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline]\n  #2: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, at: qdisc_tree_reduce_backlog+0x84/0x580 net/sched/sch_api.c:792\n\nstack backtrace:\nCPU: 1 PID: 1142 Comm: udevd Not tainted 6.1.74-syzkaller #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024\nCall Trace:\n \u003cTASK\u003e\n  [\u003cffffffff85b85f14\u003e] __dump_stack lib/dump_stack.c:88 [inline]\n  [\u003cffffffff85b85f14\u003e] dump_stack_lvl+0x1b1/0x28f lib/dump_stack.c:106\n  [\u003cffffffff85b86007\u003e] dump_stack+0x15/0x1e lib/dump_stack.c:113\n  [\u003cffffffff81802299\u003e] lockdep_rcu_suspicious+0x1b9/0x260 kernel/locking/lockdep.c:6592\n  [\u003cffffffff84f0054c\u003e] qdisc_lookup+0xac/0x6f0 net/sched/sch_api.c:305\n  [\u003cffffffff84f037c3\u003e] qdisc_tree_reduce_backlog+0x243/0x580 net/sched/sch_api.c:811\n  [\u003cffffffff84f5b78c\u003e] pfifo_tail_enqueue+0x32c/0x4b0 net/sched/sch_fifo.c:51\n  [\u003cffffffff84fbcf63\u003e] qdisc_enqueue include/net/sch_generic.h:833 [inline]\n  [\u003cffffffff84fbcf63\u003e] netem_dequeue+0xeb3/0x15d0 net/sched/sch_netem.c:723\n  [\u003cffffffff84eecab9\u003e] dequeue_skb net/sched/sch_generic.c:292 [inline]\n  [\u003cffffffff84eecab9\u003e] qdisc_restart net/sched/sch_generic.c:397 [inline]\n  [\u003cffffffff84eecab9\u003e] __qdisc_run+0x249/0x1e60 net/sched/sch_generic.c:415\n  [\u003cffffffff84d7aa96\u003e] qdisc_run+0xd6/0x260 include/net/pkt_sched.h:125\n  [\u003cffffffff84d85d29\u003e] net_tx_action+0x7c9/0x970 net/core/dev.c:5313\n  [\u003cffffffff85e002bd\u003e] __do_softirq+0x2bd/0x9bd kernel/softirq.c:616\n  [\u003cffffffff81568bca\u003e] invoke_softirq kernel/softirq.c:447 [inline]\n  [\u003cffffffff81568bca\u003e] __irq_exit_rcu+0xca/0x230 kernel/softirq.c:700\n  [\u003cffffffff81568ae9\u003e] irq_exit_rcu+0x9/0x20 kernel/softirq.c:712\n  [\u003cffffffff85b89f52\u003e] sysvec_apic_timer_interrupt+0x42/0x90 arch/x86/kernel/apic/apic.c:1107\n  [\u003cffffffff85c00ccb\u003e] asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:656"
        },
        {
          "lang": "es",
          "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: net/sched: corrige lockdep splat en qdisc_tree_reduce_backlog() qdisc_tree_reduce_backlog() se llama con el bloqueo de qdisc retenido, no con RTNL. Debemos usar qdisc_lookup_rcu() en lugar de qdisc_lookup() syzbot inform\u00f3: ADVERTENCIA: uso sospechoso de RCU 6.1.74-syzkaller #0 No contaminado ---------------------- ------- \u00a1net/sched/sch_api.c:305 uso sospechoso de rcu_dereference_protected()! otra informaci\u00f3n que podr\u00eda ayudarnos a depurar esto: rcu_scheduler_active = 2, debug_locks = 1 3 bloqueos mantenidos por udevd/1142: #0: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, en: rcu_lock_acquire include/linux /rcupdate.h:306 [en l\u00ednea] #0: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, en: rcu_read_lock include/linux/rcupdate.h:747 [en l\u00ednea] #0: ffffffff87c729a0 (rcu_read_lock ){....}-{1:2}, en: net_tx_action+0x64a/0x970 net/core/dev.c:5282 #1: ffff888171861108 (\u0026amp;sch-\u0026gt;q.lock){+.-.}-{ 2:2}, en: spin_lock include/linux/spinlock.h:350 [en l\u00ednea] #1: ffff888171861108 (\u0026amp;sch-\u0026gt;q.lock){+.-.}-{2:2}, en: net_tx_action+0x754 /0x970 net/core/dev.c:5297 #2: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, en: rcu_lock_acquire include/linux/rcupdate.h:306 [en l\u00ednea] #2: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, en: rcu_read_lock include/linux/rcupdate.h:747 [en l\u00ednea] #2: ffffffff87c729a0 (rcu_read_lock){....}-{1:2} , en: qdisc_tree_reduce_backlog+0x84/0x580 net/sched/sch_api.c:792 stack backtrace: CPU: 1 PID: 1142 Comm: udevd Not tainted 6.1.74-syzkaller #0 Nombre del hardware: Google Google Compute Engine/Google Compute Engine, BIOS Google 25/01/2024 Seguimiento de llamadas:  [] __dump_stack lib/dump_stack.c:88 [en l\u00ednea] [] dump_stack_lvl+0x1b1/0x28f lib/dump_stack.c:106 [ ] dump_stack+0x15/0x1e lib/dump_stack.c:113 [] lockdep_rcu_suspicious+0x1b9/0x260 kernel/locking/lockdep.c:6592 [] qdisc_lookup+0xac/0x6f0 net/sched/sch_a foto.c: 305 [] qdisc_tree_reduce_backlog+0x243/0x580 net/sched/sch_api.c:811 [] pfifo_tail_enqueue+0x32c/0x4b0 net/sched/sch_fifo.c:51 [ ] qdisc_enqueue incluye/net/sch_generic .h:833 [en l\u00ednea] [] netem_dequeue+0xeb3/0x15d0 net/sched/sch_netem.c:723 [] dequeue_skb net/sched/sch_generic.c:292 [en l\u00ednea] [] qdisc_restart net/sched/sch_generic.c:397 [en l\u00ednea] [] __qdisc_run+0x249/0x1e60 net/sched/sch_generic.c:415 [] qdisc_run+0xd6/0x260 include/net/pkt_sched.h:125 [] net_tx_action+0x7c9/0x970 net/core/dev.c:5313 [] __do_softirq+0x2bd/0x9bd kernel/softirq.c:616 [] invoke_softirq kernel/softirq.c: 447 [ en l\u00ednea] [] __irq_exit_rcu+0xca/0x230 kernel/softirq.c:700 [] irq_exit_rcu+0x9/0x20 kernel/softirq.c:712 [] sysvec_apic_timer_interrupt+0 x42/0x90 arco/x86/ kernel/apic/apic.c:1107 [] asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:656"
        }
      ],
      "id": "CVE-2024-35892",
      "lastModified": "2024-11-21T09:21:08.533",
      "published": "2024-05-19T09:15:10.230",
      "references": [
        {
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "url": "https://git.kernel.org/stable/c/07696415526bee0607e495017369c7303a4792e1"
        },
        {
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "url": "https://git.kernel.org/stable/c/7eb322360b0266481e560d1807ee79e0cef5742b"
        },
        {
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "url": "https://git.kernel.org/stable/c/b7d1ce2cc7192e8a037faa3f5d3ba72c25976460"
        },
        {
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "url": "https://git.kernel.org/stable/c/c040b99461a5bfc14c2d0cbb1780fcc3a4706c7e"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "url": "https://git.kernel.org/stable/c/07696415526bee0607e495017369c7303a4792e1"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "url": "https://git.kernel.org/stable/c/7eb322360b0266481e560d1807ee79e0cef5742b"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "url": "https://git.kernel.org/stable/c/b7d1ce2cc7192e8a037faa3f5d3ba72c25976460"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "url": "https://git.kernel.org/stable/c/c040b99461a5bfc14c2d0cbb1780fcc3a4706c7e"
        }
      ],
      "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "vulnStatus": "Awaiting Analysis"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "net/sched/sch_api.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "lessThan": "b7d1ce2cc7192e8a037faa3f5d3ba72c25976460",
                    "status": "affected",
                    "version": "9d9a38b5639fcefacc1e977567fb4b4e4a74d0b3",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "c040b99461a5bfc14c2d0cbb1780fcc3a4706c7e",
                    "status": "affected",
                    "version": "d636fc5dd692c8f4e00ae6e0359c0eceeb5d9bdb",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "07696415526bee0607e495017369c7303a4792e1",
                    "status": "affected",
                    "version": "d636fc5dd692c8f4e00ae6e0359c0eceeb5d9bdb",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "7eb322360b0266481e560d1807ee79e0cef5742b",
                    "status": "affected",
                    "version": "d636fc5dd692c8f4e00ae6e0359c0eceeb5d9bdb",
                    "versionType": "git"
                  },
                  {
                    "status": "affected",
                    "version": "3a4741bb13caf482b877b10ac1bcf7390cad7077",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "6.1.85",
                    "status": "affected",
                    "version": "6.1.34",
                    "versionType": "semver"
                  },
                  {
                    "lessThan": "6.4",
                    "status": "affected",
                    "version": "6.3.8",
                    "versionType": "semver"
                  }
                ]
              },
              {
                "defaultStatus": "affected",
                "product": "Linux",
                "programFiles": [
                  "net/sched/sch_api.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "status": "affected",
                    "version": "6.4"
                  },
                  {
                    "lessThan": "6.4",
                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.1.*",
                    "status": "unaffected",
                    "version": "6.1.85",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.6.*",
                    "status": "unaffected",
                    "version": "6.6.26",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.8.*",
                    "status": "unaffected",
                    "version": "6.8.5",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "6.9",
                    "versionType": "original_commit_for_fix"
                  }
                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "configurations": [
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "4C624EBB-880F-45BF-B0B9-336AABC3C61F",
                    "versionEndExcluding": "6.1.85",
                    "versionStartIncluding": "6.1.34",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "378F88D2-FE75-4F7D-BD8C-513E60387ABB",
                    "versionEndExcluding": "6.6.26",
                    "versionStartIncluding": "6.3.8",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "DBD6C99E-4250-4DFE-8447-FF2075939D10",
                    "versionEndExcluding": "6.8.5",
                    "versionStartIncluding": "6.7",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:6.9:rc1:*:*:*:*:*:*",
                    "matchCriteriaId": "22BEDD49-2C6D-402D-9DBF-6646F6ECD10B",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:6.9:rc2:*:*:*:*:*:*",
                    "matchCriteriaId": "DF73CB2A-DFFD-46FB-9BFE-AA394F27EA37",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: fix lockdep splat in qdisc_tree_reduce_backlog()\n\nqdisc_tree_reduce_backlog() is called with the qdisc lock held,\nnot RTNL.\n\nWe must use qdisc_lookup_rcu() instead of qdisc_lookup()\n\nsyzbot reported:\n\nWARNING: suspicious RCU usage\n6.1.74-syzkaller #0 Not tainted\n-----------------------------\nnet/sched/sch_api.c:305 suspicious rcu_dereference_protected() usage!\n\nother info that might help us debug this:\n\nrcu_scheduler_active = 2, debug_locks = 1\n3 locks held by udevd/1142:\n  #0: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:306 [inline]\n  #0: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline]\n  #0: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, at: net_tx_action+0x64a/0x970 net/core/dev.c:5282\n  #1: ffff888171861108 (\u0026sch-\u003eq.lock){+.-.}-{2:2}, at: spin_lock include/linux/spinlock.h:350 [inline]\n  #1: ffff888171861108 (\u0026sch-\u003eq.lock){+.-.}-{2:2}, at: net_tx_action+0x754/0x970 net/core/dev.c:5297\n  #2: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:306 [inline]\n  #2: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline]\n  #2: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, at: qdisc_tree_reduce_backlog+0x84/0x580 net/sched/sch_api.c:792\n\nstack backtrace:\nCPU: 1 PID: 1142 Comm: udevd Not tainted 6.1.74-syzkaller #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024\nCall Trace:\n \u003cTASK\u003e\n  [\u003cffffffff85b85f14\u003e] __dump_stack lib/dump_stack.c:88 [inline]\n  [\u003cffffffff85b85f14\u003e] dump_stack_lvl+0x1b1/0x28f lib/dump_stack.c:106\n  [\u003cffffffff85b86007\u003e] dump_stack+0x15/0x1e lib/dump_stack.c:113\n  [\u003cffffffff81802299\u003e] lockdep_rcu_suspicious+0x1b9/0x260 kernel/locking/lockdep.c:6592\n  [\u003cffffffff84f0054c\u003e] qdisc_lookup+0xac/0x6f0 net/sched/sch_api.c:305\n  [\u003cffffffff84f037c3\u003e] qdisc_tree_reduce_backlog+0x243/0x580 net/sched/sch_api.c:811\n  [\u003cffffffff84f5b78c\u003e] pfifo_tail_enqueue+0x32c/0x4b0 net/sched/sch_fifo.c:51\n  [\u003cffffffff84fbcf63\u003e] qdisc_enqueue include/net/sch_generic.h:833 [inline]\n  [\u003cffffffff84fbcf63\u003e] netem_dequeue+0xeb3/0x15d0 net/sched/sch_netem.c:723\n  [\u003cffffffff84eecab9\u003e] dequeue_skb net/sched/sch_generic.c:292 [inline]\n  [\u003cffffffff84eecab9\u003e] qdisc_restart net/sched/sch_generic.c:397 [inline]\n  [\u003cffffffff84eecab9\u003e] __qdisc_run+0x249/0x1e60 net/sched/sch_generic.c:415\n  [\u003cffffffff84d7aa96\u003e] qdisc_run+0xd6/0x260 include/net/pkt_sched.h:125\n  [\u003cffffffff84d85d29\u003e] net_tx_action+0x7c9/0x970 net/core/dev.c:5313\n  [\u003cffffffff85e002bd\u003e] __do_softirq+0x2bd/0x9bd kernel/softirq.c:616\n  [\u003cffffffff81568bca\u003e] invoke_softirq kernel/softirq.c:447 [inline]\n  [\u003cffffffff81568bca\u003e] __irq_exit_rcu+0xca/0x230 kernel/softirq.c:700\n  [\u003cffffffff81568ae9\u003e] irq_exit_rcu+0x9/0x20 kernel/softirq.c:712\n  [\u003cffffffff85b89f52\u003e] sysvec_apic_timer_interrupt+0x42/0x90 arch/x86/kernel/apic/apic.c:1107\n  [\u003cffffffff85c00ccb\u003e] asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:656"
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: net/sched: corrige lockdep splat en qdisc_tree_reduce_backlog() qdisc_tree_reduce_backlog() se llama con el bloqueo de qdisc retenido, no con RTNL. Debemos usar qdisc_lookup_rcu() en lugar de qdisc_lookup() syzbot inform\u00f3: ADVERTENCIA: uso sospechoso de RCU 6.1.74-syzkaller #0 No contaminado ---------------------- ------- \u00a1net/sched/sch_api.c:305 uso sospechoso de rcu_dereference_protected()! otra informaci\u00f3n que podr\u00eda ayudarnos a depurar esto: rcu_scheduler_active = 2, debug_locks = 1 3 bloqueos mantenidos por udevd/1142: #0: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, en: rcu_lock_acquire include/linux /rcupdate.h:306 [en l\u00ednea] #0: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, en: rcu_read_lock include/linux/rcupdate.h:747 [en l\u00ednea] #0: ffffffff87c729a0 (rcu_read_lock ){....}-{1:2}, en: net_tx_action+0x64a/0x970 net/core/dev.c:5282 #1: ffff888171861108 (\u0026amp;sch-\u0026gt;q.lock){+.-.}-{ 2:2}, en: spin_lock include/linux/spinlock.h:350 [en l\u00ednea] #1: ffff888171861108 (\u0026amp;sch-\u0026gt;q.lock){+.-.}-{2:2}, en: net_tx_action+0x754 /0x970 net/core/dev.c:5297 #2: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, en: rcu_lock_acquire include/linux/rcupdate.h:306 [en l\u00ednea] #2: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, en: rcu_read_lock include/linux/rcupdate.h:747 [en l\u00ednea] #2: ffffffff87c729a0 (rcu_read_lock){....}-{1:2} , en: qdisc_tree_reduce_backlog+0x84/0x580 net/sched/sch_api.c:792 stack backtrace: CPU: 1 PID: 1142 Comm: udevd Not tainted 6.1.74-syzkaller #0 Nombre del hardware: Google Google Compute Engine/Google Compute Engine, BIOS Google 25/01/2024 Seguimiento de llamadas:  [] __dump_stack lib/dump_stack.c:88 [en l\u00ednea] [] dump_stack_lvl+0x1b1/0x28f lib/dump_stack.c:106 [ ] dump_stack+0x15/0x1e lib/dump_stack.c:113 [] lockdep_rcu_suspicious+0x1b9/0x260 kernel/locking/lockdep.c:6592 [] qdisc_lookup+0xac/0x6f0 net/sched/sch_a foto.c: 305 [] qdisc_tree_reduce_backlog+0x243/0x580 net/sched/sch_api.c:811 [] pfifo_tail_enqueue+0x32c/0x4b0 net/sched/sch_fifo.c:51 [ ] qdisc_enqueue incluye/net/sch_generic .h:833 [en l\u00ednea] [] netem_dequeue+0xeb3/0x15d0 net/sched/sch_netem.c:723 [] dequeue_skb net/sched/sch_generic.c:292 [en l\u00ednea] [] qdisc_restart net/sched/sch_generic.c:397 [en l\u00ednea] [] __qdisc_run+0x249/0x1e60 net/sched/sch_generic.c:415 [] qdisc_run+0xd6/0x260 include/net/pkt_sched.h:125 [] net_tx_action+0x7c9/0x970 net/core/dev.c:5313 [] __do_softirq+0x2bd/0x9bd kernel/softirq.c:616 [] invoke_softirq kernel/softirq.c: 447 [ en l\u00ednea] [] __irq_exit_rcu+0xca/0x230 kernel/softirq.c:700 [] irq_exit_rcu+0x9/0x20 kernel/softirq.c:712 [] sysvec_apic_timer_interrupt+0 x42/0x90 arco/x86/ kernel/apic/apic.c:1107 [] asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:656"
          }
        ],
        "id": "CVE-2024-35892",
        "lastModified": "2026-06-17T07:35:39.257",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 5.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2024-35892",
                "options": [
                  {
                    "exploitation": "none"
                  },
                  {
                    "automatable": "no"
                  },
                  {
                    "technicalImpact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-05-23T19:36:07.702598Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2024-05-19T09:15:10.230",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/07696415526bee0607e495017369c7303a4792e1"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/7eb322360b0266481e560d1807ee79e0cef5742b"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/b7d1ce2cc7192e8a037faa3f5d3ba72c25976460"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/c040b99461a5bfc14c2d0cbb1780fcc3a4706c7e"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/07696415526bee0607e495017369c7303a4792e1"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/7eb322360b0266481e560d1807ee79e0cef5742b"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/b7d1ce2cc7192e8a037faa3f5d3ba72c25976460"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/c040b99461a5bfc14c2d0cbb1780fcc3a4706c7e"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-667"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-28T11:06:56+00:00",
      "cve": "CVE-2024-35892",
      "id": "CVE-2024-35892",
      "initial_release_date": "2024-05-19T00:00:00+00:00",
      "product_status:fixed": "280",
      "product_status:known_affected": "64",
      "product_status:known_not_affected": "56",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net/sched: fix lockdep splat in qdisc_tree_reduce_backlog()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-35892.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-02T01:31:13Z",
      "cve": "CVE-2024-35892",
      "id": "CVE-2024-35892",
      "initial_release_date": "2024-05-21T01:59:27Z",
      "product_status:known_affected": "416",
      "product_status:known_not_affected": "373",
      "product_status:recommended": "353",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2024-35892",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2024-35892.json",
      "version": "75"
    },
    "vulnrichment": {
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                "url": "https://git.kernel.org/stable/c/b7d1ce2cc7192e8a037faa3f5d3ba72c25976460"
              },
              {
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                "url": "https://git.kernel.org/stable/c/c040b99461a5bfc14c2d0cbb1780fcc3a4706c7e"
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                "url": "https://git.kernel.org/stable/c/07696415526bee0607e495017369c7303a4792e1"
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                "url": "https://git.kernel.org/stable/c/7eb322360b0266481e560d1807ee79e0cef5742b"
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            "title": "CVE Program Container"
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            "metrics": [
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                  "content": {
                    "id": "CVE-2024-35892",
                    "options": [
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                      },
                      {
                        "Automatable": "no"
                      },
                      {
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                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2024-05-23T19:36:07.702598Z",
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              "versions": [
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                  "version": "6.6.26",
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                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "6.9",
                  "versionType": "original_commit_for_fix"
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          ],
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              "nodes": [
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                      "vulnerable": true
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          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: fix lockdep splat in qdisc_tree_reduce_backlog()\n\nqdisc_tree_reduce_backlog() is called with the qdisc lock held,\nnot RTNL.\n\nWe must use qdisc_lookup_rcu() instead of qdisc_lookup()\n\nsyzbot reported:\n\nWARNING: suspicious RCU usage\n6.1.74-syzkaller #0 Not tainted\n-----------------------------\nnet/sched/sch_api.c:305 suspicious rcu_dereference_protected() usage!\n\nother info that might help us debug this:\n\nrcu_scheduler_active = 2, debug_locks = 1\n3 locks held by udevd/1142:\n  #0: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:306 [inline]\n  #0: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline]\n  #0: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, at: net_tx_action+0x64a/0x970 net/core/dev.c:5282\n  #1: ffff888171861108 (\u0026sch-\u003eq.lock){+.-.}-{2:2}, at: spin_lock include/linux/spinlock.h:350 [inline]\n  #1: ffff888171861108 (\u0026sch-\u003eq.lock){+.-.}-{2:2}, at: net_tx_action+0x754/0x970 net/core/dev.c:5297\n  #2: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:306 [inline]\n  #2: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline]\n  #2: ffffffff87c729a0 (rcu_read_lock){....}-{1:2}, at: qdisc_tree_reduce_backlog+0x84/0x580 net/sched/sch_api.c:792\n\nstack backtrace:\nCPU: 1 PID: 1142 Comm: udevd Not tainted 6.1.74-syzkaller #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024\nCall Trace:\n \u003cTASK\u003e\n  [\u003cffffffff85b85f14\u003e] __dump_stack lib/dump_stack.c:88 [inline]\n  [\u003cffffffff85b85f14\u003e] dump_stack_lvl+0x1b1/0x28f lib/dump_stack.c:106\n  [\u003cffffffff85b86007\u003e] dump_stack+0x15/0x1e lib/dump_stack.c:113\n  [\u003cffffffff81802299\u003e] lockdep_rcu_suspicious+0x1b9/0x260 kernel/locking/lockdep.c:6592\n  [\u003cffffffff84f0054c\u003e] qdisc_lookup+0xac/0x6f0 net/sched/sch_api.c:305\n  [\u003cffffffff84f037c3\u003e] qdisc_tree_reduce_backlog+0x243/0x580 net/sched/sch_api.c:811\n  [\u003cffffffff84f5b78c\u003e] pfifo_tail_enqueue+0x32c/0x4b0 net/sched/sch_fifo.c:51\n  [\u003cffffffff84fbcf63\u003e] qdisc_enqueue include/net/sch_generic.h:833 [inline]\n  [\u003cffffffff84fbcf63\u003e] netem_dequeue+0xeb3/0x15d0 net/sched/sch_netem.c:723\n  [\u003cffffffff84eecab9\u003e] dequeue_skb net/sched/sch_generic.c:292 [inline]\n  [\u003cffffffff84eecab9\u003e] qdisc_restart net/sched/sch_generic.c:397 [inline]\n  [\u003cffffffff84eecab9\u003e] __qdisc_run+0x249/0x1e60 net/sched/sch_generic.c:415\n  [\u003cffffffff84d7aa96\u003e] qdisc_run+0xd6/0x260 include/net/pkt_sched.h:125\n  [\u003cffffffff84d85d29\u003e] net_tx_action+0x7c9/0x970 net/core/dev.c:5313\n  [\u003cffffffff85e002bd\u003e] __do_softirq+0x2bd/0x9bd kernel/softirq.c:616\n  [\u003cffffffff81568bca\u003e] invoke_softirq kernel/softirq.c:447 [inline]\n  [\u003cffffffff81568bca\u003e] __irq_exit_rcu+0xca/0x230 kernel/softirq.c:700\n  [\u003cffffffff81568ae9\u003e] irq_exit_rcu+0x9/0x20 kernel/softirq.c:712\n  [\u003cffffffff85b89f52\u003e] sysvec_apic_timer_interrupt+0x42/0x90 arch/x86/kernel/apic/apic.c:1107\n  [\u003cffffffff85c00ccb\u003e] asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:656"
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-05-23T15:44:48.543Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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            {
              "url": "https://git.kernel.org/stable/c/7eb322360b0266481e560d1807ee79e0cef5742b"
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        "assignerShortName": "Linux",
        "cveId": "CVE-2024-35892",
        "datePublished": "2024-05-19T08:34:47.914Z",
        "dateReserved": "2024-05-17T13:50:33.113Z",
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}



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