{"cve":"CVE-2026-74266","nvd":{"published":"2026-08-15T06:22:25.920","modified":"2026-08-17T06:19:20.190","status":"Received","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: sch_dualpi2: Do not call qdisc_tree_reduce_backlog during peek before restoring qlen\n\nWhenever dualpi2 drops packets during peek, it calls\nqdisc_tree_reduce_backlog. An issue arises because it calls\nqdisc_tree_reduce_backlog before it reincrements the qlen. If qlen drops\nto zero, but peek returns an skb, the parent's qlen_notify callback will be\nexecuted even though dualpi2 still has 1 packet on the queue and, thus,\nmistakenly deactivates the parent's class which leads to a null-ptr-deref:\n\n[  101.427314][  T599] Oops: general protection fault, probably for non-canonical address 0xdffffc0000000009: 0000 [#1] SMP KASAN NOPTI\n[  101.427755][  T599] KASAN: null-ptr-deref in range [0x0000000000000048-0x000000000000004f]\n[  101.428048][  T599] CPU: 2 UID: 0 PID: 599 Comm: ping Not tainted 7.1.0-rc5-00284-gbce53c430ed7 #102 PREEMPT(full)\n[  101.428400][  T599] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011\n[  101.428608][  T599] RIP: 0010:qfq_dequeue (net/sched/sch_qfq.c:1150) sch_qfq\n[  101.428821][  T599] Code: 00 fc ff df 80 3c 02 00 0f 85 46 0c 00 00 4c 8d 73 48 48 89 9d b8 02 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 f2 48 c1 ea 03 <80> 3c 02 00 0f 85 2d 0c 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b\nAll code\n[  101.429348][  T599] RSP: 0018:ffff8881110df4f0 EFLAGS: 00010216\n[  101.429541][  T599] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: dffffc0000000000\n[  101.429763][  T599] RDX: 0000000000000009 RSI: 00000024c0000000 RDI: ffff88811436c2b0\n[  101.429985][  T599] RBP: ffff88811436c000 R08: ffff88811436c280 R09: 1ffff11021277523\n[  101.430206][  T599] R10: 1ffff11021277526 R11: 1ffff11021277527 R12: 00000024c0000000\n[  101.430423][  T599] R13: ffff88811436c2b8 R14: 0000000000000048 R15: 0000000020000000\n[  101.430642][  T599] FS:  00007f61813e1c40(0000) GS:ffff8881691ef000(0000) knlGS:0000000000000000\n[  101.430913][  T599] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[  101.431100][  T599] CR2: 00005651650850a8 CR3: 000000010ca0b000 CR4: 0000000000750ef0\n[  101.431320][  T599] PKRU: 55555554\n[  101.431433][  T599] Call Trace:\n[  101.431544][  T599]  <TASK>\n[  101.431628][  T599]  __qdisc_run (net/sched/sch_generic.c:322 net/sched/sch_generic.c:427 net/sched/sch_generic.c:445)\n[  101.431792][  T599]  ? dev_qdisc_enqueue (./include/trace/events/qdisc.h:49 (discriminator 22) net/core/dev.c:4176 (discriminator 22))\n[  101.431941][  T599]  __dev_queue_xmit (./include/net/pkt_sched.h:120 ./include/net/pkt_sched.h:117 net/core/dev.c:4292 net/core/dev.c:4831)\n\nFix this by only calling qdisc_tree_reduce_backlog in peek after the\nqlen is restored.","cvss_v4":null,"cvss_v3":null,"cwes":[],"references":["https://git.kernel.org/stable/c/15cd0c93bf4f892d66bc7a93667e2357b5673365","https://git.kernel.org/stable/c/466f29477cae2bd1982a066d518a9b20c5a37924","https://git.kernel.org/stable/c/bd851b10daee7199a658458b8ce250e95a334500"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:48:17.459049833+00:00"},"epss":{"cve":"CVE-2026-74266","score":0.00206,"percentile":0.1075,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}