{ "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-2024-35892", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2024-35892", "idYear": 2024, "status": "PUBLISHED", "publishedAt": "2024-05-19T08:34:47.914Z", "updatedAt": "2026-05-23T15:44:48.543Z", "importedAt": "2026-10-24T01:57:11.582Z", "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: fix lockdep splat in qdisc_tree_reduce_backlog()", "summary": "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 (&sch->q.lock){+.-.}-{2:2}, at: spin_lock include/linux/spinlock.h:350 [inline]\n #1: ffff888171861108 (&sch->q.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 \n [] __dump_stack lib/dump_stack.c:88 [inline]\n [] dump_stack_lvl+0x1b1/0x28f lib/dump_stack.c:106\n [] dump_stack+0x15/0x1e lib/dump_stack.c:113\n [] lockdep_rcu_suspicious+0x1b9/0x260 kernel/locking/lockdep.c:6592\n [] qdisc_lookup+0xac/0x6f0 net/sched/sch_api.c:305\n [] qdisc_tree_reduce_backlog+0x243/0x580 net/sched/sch_api.c:811\n [] pfifo_tail_enqueue+0x32c/0x4b0 net/sched/sch_fifo.c:51\n [] qdisc_enqueue include/net/sch_generic.h:833 [inline]\n [] netem_dequeue+0xeb3/0x15d0 net/sched/sch_netem.c:723\n [] dequeue_skb net/sched/sch_generic.c:292 [inline]\n [] qdisc_restart net/sched/sch_generic.c:397 [inline]\n [] __qdisc_run+0x249/0x1e60 net/sched/sch_generic.c:415\n [] qdisc_run+0xd6/0x260 include/net/pkt_sched.h:125\n [] net_tx_action+0x7c9/0x970 net/core/dev.c:5313\n [] __do_softirq+0x2bd/0x9bd kernel/softirq.c:616\n [] invoke_softirq kernel/softirq.c:447 [inline]\n [] __irq_exit_rcu+0xca/0x230 kernel/softirq.c:700\n [] irq_exit_rcu+0x9/0x20 kernel/softirq.c:712\n [] sysvec_apic_timer_interrupt+0x42/0x90 arch/x86/kernel/apic/apic.c:1107\n [] asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:656", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "9d9a38b5639fcefacc1e977567fb4b4e4a74d0b3", "status": "affected", "versionType": "git", "lessThan": "b7d1ce2cc7192e8a037faa3f5d3ba72c25976460" }, { "version": "d636fc5dd692c8f4e00ae6e0359c0eceeb5d9bdb", "status": "affected", "versionType": "git", "lessThan": "c040b99461a5bfc14c2d0cbb1780fcc3a4706c7e" }, { "version": "d636fc5dd692c8f4e00ae6e0359c0eceeb5d9bdb", "status": "affected", "versionType": "git", "lessThan": "07696415526bee0607e495017369c7303a4792e1" }, { "version": "d636fc5dd692c8f4e00ae6e0359c0eceeb5d9bdb", "status": "affected", "versionType": "git", "lessThan": "7eb322360b0266481e560d1807ee79e0cef5742b" }, { "version": "3a4741bb13caf482b877b10ac1bcf7390cad7077", "status": "affected", "versionType": "git" }, { "version": "6.1.34", "status": "affected", "versionType": "semver", "lessThan": "6.1.85" }, { "version": "6.3.8", "status": "affected", "versionType": "semver", "lessThan": "6.4" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "6.4", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "6.4" }, { "version": "6.1.85", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.26", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.8.5", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.8.*" }, { "version": "6.9", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }