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A memory leak vulnerability in the Linux kernel's network scheduler subsystem (net_sched) was fixed. The issue involved improper handling of packet queues when the root queuing discipline (qdisc) did not implement a specific flag (TCQ_F_DEQUEUE_DROPS), causing packets to remain stranded and not freed. This could lead to resource exhaustion. The vulnerability has been addressed by modifying the packet drop handling logic to correctly manage the root qdisc's to_free list. The fix is included in Linux kernel updates for various Ubuntu 26.04 LTS and OEM kernel packages.

CVE-2026-53079 describes a memory leak in the Linux kernel's network scheduler (net_sched) related to deferred queuing discipline (qdisc) drops. When the network stack cleans up deferred packet lists via qdisc_run_end(), it operates on the root qdisc. If the root qdisc lacks the TCQ_F_DEQUEUE_DROPS flag, packets queued for freeing are never released and remain stranded on the child's local to_free list. The patch makes qdisc_dequeue_drop() aware of the root qdisc, checking for the flag and appending packets directly to the root's to_free list if present; otherwise, packets are dropped directly as before. This resolves the memory leak by ensuring proper packet freeing.

Detailed information about UBUNTU-CVE-2026-53079 affecting null linux-hwe-edge. Get real-time updates, technical details, and mitigation strategies.

UBUNTU-CVE-2026-53079 - Live Threat Intelligence - Threat Radar | OffSeq.com

Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: net_sched: fix skb memory leak in deferred qdisc drops When the network stack… (CVE-2026-53079)

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