Copyright © 2012 Red Hat, Inc. All rights reserved. Low 2026-06-24T00:00:00 kernel: net/sched: netem: fix queue limit check to include reordered packets 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CWE-770

In the Linux kernel, the following vulnerability has been resolved: net/sched: netem: fix queue limit check to include reordered packets The queue limit check in netem_enqueue() uses q->t_len which only counts packets in the internal tfifo. Packets placed in sch->q by the reorder path (__qdisc_enqueue_head) are not counted, allowing the total queue occupancy to exceed sch->limit under reordering. Include sch->q.qlen in the limit check.

A flaw was found in the Linux kernel's networking scheduler (netem). The queue limit check in the `netem_enqueue()` function does not properly account for reordered packets, allowing the total queue occupancy to exceed its configured limit. This oversight can lead to a Denial of Service (DoS) condition, where network traffic processing is disrupted due to an overloaded queue.

Red Hat Enterprise Linux 10 Fix deferred kernel Red Hat Enterprise Linux 6 Out of support scope kernel Red Hat Enterprise Linux 7 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel-rt Red Hat Enterprise Linux 8 Not affected kernel Red Hat Enterprise Linux 8 Not affected kernel-rt Red Hat Enterprise Linux 9 Fix deferred kernel Red Hat Enterprise Linux 9 Fix deferred kernel-rt https://www.cve.org/CVERecord?id=CVE-2026-52984 https://nvd.nist.gov/vuln/detail/CVE-2026-52984 https://lore.kernel.org/linux-cve-announce/2026062442-CVE-2026-52984-110c@gregkh/T