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CVE-2026-43496: Linux

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CVSS

0,1%

Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

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    Описание

    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_red: Replace direct dequeue call with peek and qdisc_dequeue_peeked When red qdisc has children (eg qfq qdisc) whose peek() callback is qdisc_peek_dequeued(), we could get a kernel panic. When the parent of such qdiscs (eg illustrated in patch #3 as tbf) wants to retrieve an skb from its child (red in this case), it will do the following: 1a. do a peek() - and when sensing there's an skb the child can offer, then - the child in this case(red) calls its child's (qfq) peek. qfq does the right thing and will return the gso_skb queue packet. Note: if there wasnt a gso_skb entry then qfq will store it there. 1b. invoke a dequeue() on the child (red). And herein lies the problem. - red will call the child's dequeue() which will essentially just try to grab something of qfq's queue. [ 78.667668][ T363] KASAN: null-ptr-deref in range [0x0000000000000048-0x000000000000004f] [ 78.667927][ T363] CPU: 1 UID: 0 PID: 363 Comm: ping Not tainted 7.1.0-rc1-00033-g46f74a3f7d57-dirty #790 PREEMPT(full) [ 78.668263][ T363] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 78.668486][ T363] RIP: 0010:qfq_dequeue+0x446/0xc90 [sch_qfq] [ 78.668718][ T363] Code: 54 c0 e8 dd 90 00 f1 48 c7 c7 e0 03 54 c0 48 89 de e8 ce 90 00 f1 48 8d 7b 48 b8 ff ff 37 00 48 89 fa 48 c1 e0 2a 48 c1 ea 03 <80> 3c 02 00 74 05 e8 ef a1 e1 f1 48 8b 7b 48 48 8d 54 24 58 48 8d [ 78.669312][ T363] RSP: 0018:ffff88810de573e0 EFLAGS: 00010216 [ 78.669533][ T363] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 78.669790][ T363] RDX: 0000000000000009 RSI: 0000000000000004 RDI: 0000000000000048 [ 78.670044][ T363] RBP: ffff888110dc4000 R08: ffffffffb1b0885a R09: fffffbfff6ba9078 [ 78.670297][ T363] R10: 0000000000000003 R11: ffff888110e31c80 R12: 0000001880000000 [ 78.670560][ T363] R13: ffff888110dc4150 R14: ffff888110dc42b8 R15: 0000000000000200

    Засегнати продукти

    • Linux Linux: 77be155cba4e163e8bba9fd27222a8b6189ec4f7 преди 03b0aaeba082ae981a0dfe96cdd03d02050537a1; 77be155cba4e163e8bba9fd27222a8b6189ec4f7 преди c7335f4dc0fa21f7015b910c6fc2f4d599732328; 77be155cba4e163e8bba9fd27222a8b6189ec4f7 преди 45cd83c5c470ba49fe261489c8358ad7b9df7c45; 77be155cba4e163e8bba9fd27222a8b6189ec4f7 преди 36aa34f42cb6842cf371f3a2d3e855d24fd57a50; 77be155cba4e163e8bba9fd27222a8b6189ec4f7 преди ce051eede433f876d322ac3550a36a3c6fc4c231; 77be155cba4e163e8bba9fd27222a8b6189ec4f7 преди 8d09618840b99ef00154d3e731ce9b11e096196d; 77be155cba4e163e8bba9fd27222a8b6189ec4f7 преди 587dcf970a525f543d8b5855d9f37a4ca97b76ef; 77be155cba4e163e8bba9fd27222a8b6189ec4f7 преди 458d5615272d3de535748342eb68ca492343048c
    • Linux Linux: 2.6.29; преди 2.6.29; 5.10.258 до 5.10.*; 5.15.209 до 5.15.*; 6.1.175 до 6.1.*; 6.6.140 до 6.6.*; 6.12.88 до 6.12.*; 6.18.30 до 6.18.*; 7.0.7 до 7.0.*; от 7.1 нататък
    • Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem: всички версии

    История

    • 21 май 2026 Публикувано

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