net/sched: netem: fix queue limit check to include reordered packets
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.
02 / AFFECTED SOFTWARE
Affected packages
1170 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
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.
05 / REFERENCES
Further evidence
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- https://git.kernel.org/stable/c/0f875d52db4c921da610e481b72f03cc82fdcb72
- https://git.kernel.org/stable/c/39a66e83ea41fe845631eeb8d326953de27d13f9
- https://git.kernel.org/stable/c/4185701fcce6b426b6c3630b25330dddd9c47b0d
- https://git.kernel.org/stable/c/54b5dbacd00dedffd5e2eed76de1c3839996b5e6
- https://git.kernel.org/stable/c/74fcd8e127200a50ee22ba2b45c164722bdb9177
- https://git.kernel.org/stable/c/8450462eaf91d5d2a9e863507b16d18e814baef3
- https://git.kernel.org/stable/c/936a7dd87251f6f3e88983350833edf60fe6a80b
- https://git.kernel.org/stable/c/ef9a41b3870fb90577da5b2de5bd140022d4021e
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52984.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-52984