Към съдържанието
Търсене

CVE-2026-90109: Linux

Няма оценка

CVSS

Няма данни

Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

Няма потвърждение

Атакува се

Няма данни

Време до експлоатация

    Описание

    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: net: sched: fix 32-bit backlog wrap in gred, bfifo and plug enqueue gred_enqueue(), bfifo_enqueue() and plug_enqueue() admit a packet when the current backlog plus the packet length fits within the queue limit: sch->qstats.backlog + qdisc_pkt_len(skb) <= sch->limit (gred default VQ) gred_backlog+qdisc_pkt_len(skb) <= q->limit (gred configured VQ) sch->qstats.backlog + qdisc_pkt_len(skb) <= sch->limit (bfifo) sch->qstats.backlog + skb->len <= q->limit (plug) sch->qstats.backlog and q->backlog are u32, and qdisc_pkt_len()/skb->len are unsigned int, so all sums are computed in 32 bits and wrap at 2^32. Once the true backlog exceeds 4 GiB the wrapped sum becomes small and admission keeps succeeding, so the queue grows without bound and the kernel can be driven to OOM. Promote the sums to u64 so admission stops once the true backlog exceeds the limit. The limit is u32, so the bounded queue stays below 2^32 and the stored u32 backlog never wraps. The bug can only be reproduced as root (albeit with ridiculous setup): attach a gred (or bfifo/plug) qdisc with a limit near 4 GiB, leaving the default VQ unconfigured (for gred), and drive >4 GiB of queued traffic (e.g. via a size table / stab to inflate qdisc_pkt_len, or sustained high-rate traffic). The u32 backlog+len sum wraps at 2^32, admission keeps succeeding, and the queue grows unboundedly to OOM.

    Засегнати продукти

    • Linux Linux: a3eb95f891d6130b1fc03dd07a8b54cf0a5c8ab8 преди 771a1123570b487765bcf2d4cff3567e66bf1322; a3eb95f891d6130b1fc03dd07a8b54cf0a5c8ab8 преди c5ca77024812563fe15c4f7aa906791c3683e9fd; a3eb95f891d6130b1fc03dd07a8b54cf0a5c8ab8 преди 3fb51b3960342bbee563543f8d33710fd0fb5a96; a3eb95f891d6130b1fc03dd07a8b54cf0a5c8ab8 преди 8b2d8c70b969bf84f9e248bfaf2a7135129f2eb6; a3eb95f891d6130b1fc03dd07a8b54cf0a5c8ab8 преди d98b92f3d57976ae185238946ec5ea0be32195aa; a3eb95f891d6130b1fc03dd07a8b54cf0a5c8ab8 преди 4c660ee8c809637909f4f7eb1017f7b9401c75c4
    • Linux Linux: 4.2; преди 4.2; 6.1.191 до 6.1.*; 6.6.160 до 6.6.*; 6.12.110 до 6.12.*; 6.18.52 до 6.18.*; 7.2.6 до 7.2.*; от 7.3 нататък

    История

    • 17 септември 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-90109: Linux | freedomonline.bg